Toyota Avalon (XX50): Wiper And Washer System(for Gasoline Model)

Toyota Avalon (XX50) 2019-2022 Service & Repair Manual / Vehicle Exterior / Wiper / Washer / Wiper And Washer System(for Gasoline Model)

Lost Communication with Wiper ECU LIN (B1245)

DESCRIPTION

The main body ECU (multiplex network body ECU) and windshield wiper motor assembly communicate via LIN communication. The main body ECU (multiplex network body ECU) stores this DTC if communication becomes abnormal.

DTC No.	Detection Item	DTC Detection Condition	Trouble Area	Memory	DTC Output from
B1245	Lost Communication with Wiper ECU LIN	Battery voltage is 9.5 V or more Communication malfunction between the main body ECU (multiplex network body ECU) and windshield wiper motor assembly 10 seconds or more	Windshield wiper motor assembly Main body ECU (multiplex network body ECU) WIPER relay Harness or connector	○	Main body ECU (multiplex network body ECU)

DTC No.

Detection Item

DTC Detection Condition

Trouble Area

Memory

DTC Output from

B1245

Lost Communication with Wiper ECU LIN

Battery voltage is 9.5 V or more

Communication malfunction between the main body ECU (multiplex network body ECU) and windshield wiper motor assembly

10 seconds or more

Windshield wiper motor assembly
Main body ECU (multiplex network body ECU)
WIPER relay
Harness or connector

○

Main body ECU (multiplex network body ECU)

WIRING DIAGRAM

CAUTION / NOTICE / HINT

NOTICE:

Before replacing the main body ECU (multiplex network body ECU), refer to Registration.

Click here

PROCEDURE

1.	CHECK FOR DTC

(a) Connect the Techstream to the DLC3.

(b) Turn the engine switch on (IG).

(d) Enter the following menus: Body Electrical / Main Body / Trouble Codes.

(e) Check for DTCs.

Body Electrical > Main Body > Trouble Codes

Result	Proceed to
Only DTC B1245 is output	A
DTC B1245 and B1373 are output	B

GO TO B1373

2.	CHECK HARNESS AND CONNECTOR (WINDSHIELD WIPER MOTOR ASSEMBLY - MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU))

(a) Disconnect the A26 windshield wiper motor assembly connector.

(b) Disconnect the G32 main body ECU (multiplex network body ECU) connector.

Standard Resistance:

Tester Connection	Condition	Specified Condition
G32-3 (LIN3) - A26-2 (LIN)	Always	Below 1 Ω

REPAIR OR REPLACE HARNESS OR CONNECTOR

3.	CHECK MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU)

*a	Component without harness connected (Main Body ECU (Multiplex Network Body ECU)

(a) Check for pulses according to the value(s) in the table below.

Standard Voltage:

Tester Connection	Condition	Specified Condition
G32-3 (LIN3) - Body ground	Engine switch off	Below 1 V
G32-3 (LIN3) - Body ground	Engine switch on (IG)	Pulse generation

REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU)

4.	PERFORM ACTIVE TEST USING TECHSTREAM

(a) Connect the Techstream to the DLC3.

(b) Turn the engine switch on (IG).

(d) Enter following menus: Body Electrical / Main Body / Active Test.

(e) Perform the Active Test according to the display on the Techstream.

Body Electrical > Main Body > Active Test

Tester Display	Measurement Item	Control Range	Diagnostic Note
Wiper Power Relay	Function to operate the WIPER relay	OFF or ON	-

Body Electrical > Main Body > Active Test

Tester Display
Wiper Power Relay

OK:

WIPER relay operates normally.

GO TO STEP 10

5.	CHECK HARNESS AND CONNECTOR (WINDSHIELD WIPER MOTOR ASSEMBLY - BODY GROUND)

(a) Measure the resistance according to the value(s) in the table below.

Standard Resistance:

Tester Connection	Condition	Specified Condition
A26-1 (GND) - Body ground	Always	Below 1 Ω

REPAIR OR REPLACE HARNESS OR CONNECTOR

6.	CHECK HARNESS AND CONNECTOR (POWER SOURCE - WINDSHIELD WIPER MOTOR ASSEMBLY)

(a) Measure the voltage according to the value(s) in the table below.

Standard Voltage:

Tester Connection	Condition	Specified Condition
A26-4 (+B) - Body ground	Engine switch on (IG)	11 to 14 V
	Less than approximately 60 seconds after engine switch turned off	11 to 14 V
	Approximately 60 seconds or more after engine switch turned off	Below 1 V

REPLACE WINDSHIELD WIPER MOTOR ASSEMBLY

7.	INSPECT WIPER RELAY

(a) Inspect the WIPER relay.

Click here

REPLACE WIPER RELAY

8.	CHECK HARNESS AND CONNECTOR (POWER SOURCE - WIPER RELAY)

(a) Measure the voltage according to the value(s) in the table below.

Standard Voltage:

Tester Connection	Condition	Specified Condition
3 (WIPER relay) - Body ground	Always	11 to 14 V

REPAIR OR REPLACE HARNESS OR CONNECTOR

9.	CHECK HARNESS AND CONNECTOR (WINDSHIELD WIPER MOTOR ASSEMBLY - WIPER RELAY)

(a) Measure the resistance according to the value(s) in the table below.

Standard Resistance:

Tester Connection	Condition	Specified Condition
A26-4 (+B) - 5 (WIPER relay)	Always	Below 1 Ω
A26-4 (+B) or 5 (WIPER relay) - Body ground	Always	10 kΩ or higher

REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU)

REPAIR OR REPLACE HARNESS OR CONNECTOR

10.	INSPECT WIPER RELAY

(a) Inspect the WIPER relay.

Click here

REPLACE WIPER RELAY

11.	CHECK HARNESS AND CONNECTOR (WIPER RELAY - MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU))

(a) Disconnect the G33 main body ECU (multiplex network body ECU) connector.

(b) Measure the resistance according to the value(s) in the table below.

Standard Resistance:

Tester Connection	Condition	Specified Condition
1 (WIPER relay) - G33-21 (WPS)	Always	Below 1 Ω
1 (WIPER relay) or G33-21 (WPS) - Body ground	Always	10 kΩ or higher

REPAIR OR REPLACE HARNESS OR CONNECTOR

12.	CHECK HARNESS AND CONNECTOR (WIPER RELAY - BODY GROUND)

(a) Measure the resistance according to the value(s) in the table below.

Standard Resistance:

Tester Connection	Condition	Specified Condition
2 (WIPER relay) - Body ground	Always	Below 1 Ω

REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU)

REPAIR OR REPLACE HARNESS OR CONNECTOR

ECU Malfunction (B1370)

DESCRIPTION

This DTC is stored when the windshield wiper motor assembly detects an internal malfunction.

DTC No.

Detection Item

DTC Detection Condition

Trouble Area

Memory

DTC Output from

B1370

ECU Malfunction

Battery voltage is 9.5 V or more

A malfunction is detected for during the windshield wiper motor assembly self-check.

10 seconds or more

Windshield wiper motor assembly

○

Windshield wiper motor assembly

PROCEDURE

CLEAR DTC

(a) Connect the Techstream to the DLC3.

(b) Turn the engine switch on (IG).

(d) Enter the following menus: Body Electrical / Wiper / Trouble Codes.

(e) Clear the DTCs.

Body Electrical > Wiper > Clear DTCs

2.	CHECK FOR DTC

(a) Connect the Techstream to the DLC3.

(b) Turn the engine switch on (IG).

(d) Turn the Techstream on.

(e) Enter the following menus: Body Electrical / Wiper / Trouble Codes.

(f) Check for DTCs.

Body Electrical > Wiper > Trouble Codes

Result	Proceed to
DTC B1370 is not output	A
DTC B1370 is output	B

USE SIMULATION METHOD TO CHECK

REPLACE WINDSHIELD WIPER MOTOR ASSEMBLY

Wiper Switch Signal Mismatch between LIN and Line (B1372)

DESCRIPTION

Under normal operation, the windshield wiper motor assembly receives operation signals from the windshield wiper switch assembly via LIN communication.

The windshield wiper motor assembly and windshield wiper switch assembly are also connected via direct line in order to operate the front wipers in HI in an emergency. If the operation signals sent via LIN communication and direct line do not match, this DTC is stored.

DTC No.

Detection Item

DTC Detection Condition

Trouble Area

Memory

DTC Output from

B1372

Wiper Switch Signal Mismatch between LIN and Line

Battery voltage is 9.5 V or more

The operation signals sent via LIN communication and direct line do not match

10 seconds or more

Windshield wiper motor assembly
Main body ECU (multiplex network body ECU)
Steering sensor
Harness or connector

○

Windshield wiper motor assembly

WIRING DIAGRAM

CAUTION / NOTICE / HINT

NOTICE:

Before replacing the main body ECU (multiplex network body ECU), refer to Registration.

Click here

PROCEDURE

CLEAR DTC

(a) Connect the Techstream to the DLC3.

(b) Turn the engine switch on (IG).

(d) Enter the following menus: Body Electrical / Wiper / Trouble Codes.

(e) Clear the DTCs.

Body Electrical > Wiper > Clear DTCs

2.	CHECK FOR DTC

(a) Connect the Techstream to the DLC3.

(b) Turn the engine switch on (IG).

(d) Wait 10 seconds or more.

(e) Turn the Techstream on.

(f) Enter the following menus: Body Electrical / Wiper / Trouble Codes.

(g) Check for DTCs.

Body Electrical > Wiper > Trouble Codes

Result	Proceed to
DTC B1372 is not output	A
DTC B1372 is output	B

USE SIMULATION METHOD TO CHECK

3.	READ VALUE USING TECHSTREAM

(a) Connect the Techstream to the DLC3.

(b) Turn the engine switch on (IG).

(d) Enter the following menus: Body Electrical / Wiper / Data List.

(e) Read the Data List according to the display on the Techstream.

Body Electrical > Wiper > Data List

Tester Display

Measurement Item

Range

Normal Condition

Diagnostic Note

Wiper Switch HI (Line)

Front wiper switch HI position signal (direct line)

OFF or ON

OFF: Front wiper switch not in HI position

ON: Front wiper switch in HI position

Body Electrical > Wiper > Data List

Tester Display
Wiper Switch HI (Line)

OK:

The Techstream display is normal.

GO TO STEP 5

4.	READ VALUE USING TECHSTREAM

(a) Connect the Techstream to the DLC3.

(b) Turn the engine switch on (IG).

(d) Enter the following menus: Chassis / Steering Angle Sensor / Data List.

(e) Read the Data List according to the display on the Techstream.

Chassis > Steering Angle Sensor > Data List

Tester Display

Measurement Item

Range

Normal Condition

Diagnostic Note

Wiper Hi Switch

Front wiper switch HI position signal

OFF or ON

OFF: Front wiper switch not in HI position

ON: Front wiper switch in HI position

Chassis > Steering Angle Sensor > Data List

Tester Display
Wiper Hi Switch

OK:

The Techstream display is normal.

REPLACE WINDSHIELD WIPER MOTOR ASSEMBLY

REPLACE STEERING SENSOR

5.	CHECK HARNESS AND CONNECTOR (STEERING SENSOR - WINDSHIELD WIPER MOTOR ASSEMBLY)

(a) Disconnect the G48 steering sensor connector.

(b) Disconnect the A26 windshield wiper motor assembly connector.

Standard Resistance:

Tester Connection	Condition	Specified Condition
G48-2 (2S) - A26-3 (2S)	Always	Below 1 Ω
G48-2 (2S) or A26-3 (2S) - Body ground	Always	10 kΩ Higher

REPAIR OR REPLACE HARNESS OR CONNECTOR

6.	INSPECT STEERING SENSOR

Component without harness connected

(Steering Sensor)

(a) Remove the steering sensor.

Click here

(b) Measure the resistance according to the value(s) in the table below.

Standard Resistance:

Tester Connection	Condition	Specified Condition
G48-2 (2S) - z4-27 (+2)	Always	Below 1 Ω

REPLACE WINDSHIELD WIPER MOTOR ASSEMBLY

REPLACE STEERING SENSOR

Lost Communication with Wiper System LIN BUS (B1373)

DESCRIPTION

DTC No.

Detection Item

DTC Detection Condition

Trouble Area

Memory

DTC Output from

B1373

Lost Communication with Wiper System LIN BUS

Battery voltage is 9.5 V or more

A malfunction in the communication or LIN communication line between the main body ECU (multiplex network body ECU) and components of the wiper system occurs

7 seconds or more 3 times consecutively

Windshield wiper motor assembly
Main body ECU (multiplex network body ECU)
Harness or connector

○

Main body ECU (multiplex network body ECU)

WIRING DIAGRAM

CAUTION / NOTICE / HINT

NOTICE:

Before replacing the main body ECU (multiplex network body ECU), refer to Registration.

Click here

PROCEDURE

1.	CHECK HARNESS AND CONNECTOR (MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU) - WINDSHIELD WIPER MOTOR ASSEMBLY)

(a) Disconnect the G32 main body ECU (multiplex network body ECU) connector.

(b) Disconnect the A26 windshield wiper motor assembly connector.

Standard Resistance:

Tester Connection	Condition	Specified Condition
G32-3 (LIN3) or A26-2 (LIN) - Body ground	Always	10 kΩ Higher

REPAIR OR REPLACE HARNESS OR CONNECTOR

2.	CHECK MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU)

*a	Component without harness connected (Main Body ECU (Multiplex Network Body ECU)

(a) Check for pulses according to the value(s) in the table below.

Standard Voltage:

Tester Connection	Condition	Specified Condition
G32-3 (LIN3) - Body ground	Engine switch off	Below 1 V
G32-3 (LIN3) - Body ground	Engine switch on (IG)	Pulse generation

REPLACE WINDSHIELD WIPER MOTOR ASSEMBLY

REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU)

Check For Intermittent Problems

CHECK FOR INTERMITTENT PROBLEMS

NOTICE:

If the vehicle or vehicle controls are operated (for example, during initial inspection when the vehicle is brought in for repair) before operation history has been read and saved, the operation history information could be lost.
The Operation History function uses the current system time of the Techstream and the time counter inside the controlling ECU to calculate the times shown in the operation history. For this reason, before reading the operation history, first make sure that the Techstream system clock is accurately set to the current time.

CHECK OPERATION HISTORY

HINT:

The windshield wiper motor assembly records the wiper and washer system operation history, which can be read using the Techstream.

(a) Connect the Techstream to the DLC3.

(b) Turn the engine switch on (IG).

(d) Enter the following menus: Body Electrical / Wiper / Utility / Operation History.

Body Electrical > Wiper > Utility

Tester Display
Operation History

(e) Following the instructions on the screen, read and save the operation history.

Tester Display
Motor Lock Detection
Temperature Protection Detection
Overvoltage Detection
Low Voltage Detection

SYMPTOM SIMULATION

Click here

Data List / Active Test

DATA LIST / ACTIVE TEST

DATA LIST

NOTICE:

In the table below, the values listed under "Normal Condition" are reference values. Do not depend solely on these reference values when deciding whether a part is faulty or not.

HINT:

Using the Techstream to read the Data List allows the values or states of switches, sensors, actuators and other items to be read without removing any parts. This non-intrusive inspection can be very useful because intermittent conditions or signals may be discovered before parts or wiring is disturbed. Reading the Data List information early in troubleshooting is one way to save diagnostic time.

(a) Connect the Techstream to the DLC3.

(b) Turn the engine switch on (IG).

(d) Enter the following menus:

(1) for Wiper: Body Electrical / Wiper / Data List.

(2) for Main Body: Body Electrical / Main Body / Data List.

(3) for Combination Meter: Body Electrical / Combination Meter / Data List.

(4) for Steering Angle Sensor: Chassis / Steering Angle Sensor / Data List.

(e) Read the Data List according to the display on the Techstream.

Body Electrical > Wiper > Data List

Tester Display	Measurement Item	Range	Normal Condition	Diagnostic Note
Wiper Switch HI (Line)	Front wiper switch HI position signal (direct line)	OFF or ON	OFF: Front wiper switch not in HI position ON: Front wiper switch in HI position	-
Wiper Stop Position	Windshield wiper motor assembly position	Store Are/ Lower Rev Pos, Wipe Area or Upper Rev Pos	Store Are/Lower Rev Pos: Lower reverse position or lower Wipe Area: Between lower reverse position and upper reverse position Upper Rev Pos: Upper reverse position	-
Wiper Position	Windshield wiper motor assembly position	Store Are, Exchange Position or Wipe Area	Store Are: Out of wiper operating range Exchange Position: Within wiper maintenance position Wipe Area: Within wiper operating range	-
Status of Motor Lock	Windshield wiper motor assembly status	Normal or Lock	Normal: Operating normally Lock: Malfunctioning	-
Status of Temperature Protection	Windshield wiper motor assembly temperature protection	Normal, LO Operation, INT Operation or Stop	Normal: Windshield wiper motor assembly temperature is below 95°C (203°F) LO Operation: Windshield wiper motor assembly temperature is 95°C (203°F) or more INT Operation: Windshield wiper motor assembly temperature is 100°C (212°F) or more Stop: Windshield wiper motor assembly temperature is 105°C (221°F) or more	-
Status of Overvoltage	Windshield wiper motor assembly over voltage status	Normal or Overvoltage	Normal: Operating normally Overvoltage: Malfunctioning	-
Status of Low Voltage	Windshield wiper motor assembly low voltage status	Normal or Low Voltage	Normal: Operating normally Low voltage: Malfunctioning	-
Motor Shaft Angle	Windshield wiper motor assembly shaft angle status	Min.: 0° Max.: 255°	Almost the same as actual windshield wiper motor assembly shaft angle	-
Motor Temperature	Windshield wiper motor assembly temperature status	Min.: -128°C (-198.4°F) Max.: 127°C (260.6°F)	Almost the same as actual windshield wiper motor assembly temperature	-
Motor Current	Windshield wiper motor assembly current status	Min.: 0 A Max.: 63 A	Almost the same as actual windshield wiper motor assembly current	-
Motor Power Supply Voltage	Windshield wiper motor assembly voltage status	Min.: 0 V Max.: 63 V	Almost the same as actual windshield wiper motor assembly voltage	-
Number of DTCs	Number of trouble codes	0 to 255	Number of stored DTCs displayed	-

Body Electrical > Main Body > Data List

Tester Display

Measurement Item

Range

Normal Condition

Diagnostic Note

Communication Wiper ECU

Connection status between windshield wiper motor assembly and main body ECU (multiplex network body ECU)

STOP or OK

STOP: Not Connected

OK: Connected

DTCs are stored if a malfunction occurs in the CAN communication system.

Communication Humidity/Rain Sensor

Connection status between rain sensor and main body ECU (multiplex network body ECU)

STOP or OK

STOP: Not Connected

OK: Connected

Although this item is displayed on the Techstream, it is not applicable to this vehicle.

The Number of DTC

Number of trouble codes

0 to 255

Number of stored DTCs displayed

Body Electrical > Combination Meter > Data List

Tester Display

Measurement Item

Range

Normal Condition

Diagnostic Note

Washer Level Warning Switch

Washer fluid level warning switch

OFF or ON

OFF: Washer fluid level not low

ON: Washer fluid level low

Chassis > Steering Angle Sensor > Data List

Tester Display	Measurement Item	Range	Normal Condition	Diagnostic Note
Wiper OFF Switch	Front wiper switch OFF position signal	OFF or ON	OFF: Front wiper switch not in OFF position ON: Front wiper switch in OFF position	-
Wiper Auto/Int Switch	Front wiper switch INT position signal	OFF or ON	OFF: Front wiper switch not in INT position ON: Front wiper switch in INT position	-
Wiper Lo Switch	Front wiper switch LO position signal	OFF or ON	OFF: Front wiper switch not in LO position ON: Front wiper switch in LO position	-
Wiper Hi Switch	Front wiper switch HI position signal	OFF or ON	OFF: Front wiper switch not in HI position ON: Front wiper switch in HI position	-
Wiper Mist Switch	Front wiper switch MIST position signal	OFF or ON	OFF: Front wiper switch not in MIST position ON: Front wiper switch in MIST position	-
Washer Switch	Washer switch ON position signal	OFF or ON	OFF: Front washer switch not in ON position ON: Front washer switch in ON position	-
Rear Wiper Lo Switch	Rear wiper switch LO position signal	OFF or ON	OFF: Rear wiper switch not in LO position ON: Rear wiper switch in LO position	Although this item is displayed on the Techstream, it is not applicable to this vehicle.
Rear Wiper Hi Switch	Rear wiper switch HI position signal	OFF or ON	OFF: Rear wiper switch not in HI position ON: Rear wiper switch in HI position	Although this item is displayed on the Techstream, it is not applicable to this vehicle.
Rear Washer Switch	Rear washer switch ON position signal	OFF or ON	OFF: Rear washer switch not in ON position ON: Rear washer switch in ON position	Although this item is displayed on the Techstream, it is not applicable to this vehicle.
Intermittent Time Volume	Intermittent time adjustment switch condition	Shortest, Shorter, Longer or Longest	Shortest: P4 Shorter: P3 Longer: P2 Longest: P1	*
Wiper Spec Info	Function information	Unknown, Auto spec or INT spec	Unknown: Specification not stored Auto spec: w/ Auto wiper system INT spec: w/o Auto wiper system	-
The Number of DTCs	Number of trouble codes	0 to 255	Number of stored DTCs displayed	-

*: Refer to Inspection for each position of the switch.
Click here

ACTIVE TEST

HINT:

Using the Techstream to perform Active Tests allows relays, VSVs, actuators and other items to be operated without removing any parts. This non-intrusive functional inspection can be very useful because intermittent operation may be discovered before parts or wiring is disturbed. Performing Active Tests early in troubleshooting is one way to save diagnostic time. Data List information can be displayed while performing Active Tests.

(a) Connect the Techstream to the DLC3.

(b) Turn the engine switch on (IG).

(d) Enter the following menus:

(1) for Wiper: Body Electrical / Wiper / Active Test.

(2) for Main Body: Body Electrical / Main Body / Active Test.

(e) Perform the Active Test according to the display on the Techstream.

Body Electrical > Wiper > Active Test

Tester Display	Measurement Item	Control Range	Diagnostic Note
Wiper Motor LO	Function to operate the windshield wiper motor assembly in LO	OFF or ON	-
Wiper Motor HI	Function to operate the windshield wiper motor assembly in HI	OFF or ON	-

Body Electrical > Main Body > Active Test

Tester Display	Measurement Item	Control Range	Diagnostic Note
Washer Nozzle Heater	Function to operate the nozzle heater	OFF or ON	Although this item is displayed on the Techstream, it is not applicable to this vehicle.
Wiper Power Relay	Function to operate the WIPER relay	OFF or ON	-
Front Washer Relay	Function to operate the windshield washer motor and pump assembly	OFF or ON	-

Diagnostic Trouble Code Chart

DIAGNOSTIC TROUBLE CODE CHART

Wiper and Washer System

DTC No.	Detection Item	DTC Output from
B1245	Lost Communication with Wiper ECU LIN	Main body ECU (multiplex network body ECU)
B1370	ECU Malfunction	Windshield wiper motor assembly
B1372	Wiper Switch Signal Mismatch between LIN and Line	Windshield wiper motor assembly
B1373	Lost Communication with Wiper System LIN BUS	Main body ECU (multiplex network body ECU)

Dtc Check / Clear

DTC CHECK / CLEAR

CHECK FOR DTC

(a) Connect the Techstream to the DLC3.

(b) Turn the engine switch on (IG).

(d) Enter the following menus: Body Electrical / (desired system) / Trouble Codes.

Body Electrical > Wiper > Trouble Codes Body Electrical > Main Body > Trouble Codes

(e) Check for DTCs.

CLEAR DTC

(a) Connect the Techstream to the DLC3.

(b) Turn the engine switch on (IG).

(d) Enter the following menus: Body Electrical / (desired system) / Trouble Codes.

Body Electrical > Wiper > Clear DTCs Body Electrical > Main Body > Clear DTCs

(e) Clear the DTCs.

Fail-safe Chart

FAIL-SAFE CHART

PROTECTION FUNCTION

(a) The windshield wiper motor assembly operates the following protection functions if it detects an abnormal condition, in order to protect the wiper and washer system.

Item

Protection Content

Conditions to Return to Normal Condition

Overheat protection

Decreases wiper operating speed in order to protect the windshield wiper motor assembly if the windshield wiper motor assembly temperature becomes excessively high.

Prohibits wiper operation in HI when the windshield wiper motor assembly temperature is 95°C (203°F) or higher.
Prohibits wiper operation in LO and HI when the windshield wiper motor assembly temperature is 100°C (212°F) or higher.
Prohibits wiper operation when the windshield wiper motor assembly temperature is 105°C (221°F) or higher.

The windshield wiper motor assembly returns to normal.

Snow protection

Reverses the direction of the wipers and decreases their operating range when an excessive load, due to snow, etc., is detected near the extremities of the wiper operating range.

In this case, operation is stopped at the lower reverse position for a certain period of time to prevent the windshield wiper motor assembly from overheating.

Foreign matter, such as snow, is removed and the wiper operating range returns to normal.

Excessive load protection

Stops wiper operation when an excessive load is detected when the wipers are near the center of the operating range.

The front wiper switch is turned off and then to any operating position.

Freeze Frame Data

FREEZE FRAME DATA

FREEZE FRAME DATA

(a) Whenever a DTC is detected, the windshield wiper motor assembly stores the current vehicle state as Freeze Frame Data.

CHECK FREEZE FRAME DATA

(a) Connect the Techstream to the DLC3.

(b) Turn the engine switch on (IG).

(d) Enter the following menus: Body Electrical / Wiper / Trouble Codes.

Body Electrical > Wiper > Trouble Codes Body Electrical > Wiper

Tester Display	Measurement Item	Range	Normal Condition	Diagnostic Note
Wiper Switch HI (Line)	Front wiper switch HI position signal (direct line)	OFF or ON	OFF: Front wiper switch not in HI position ON: Front wiper switch in HI position	-
Wiper Stop Position	Windshield wiper motor assembly position	Store Are/Lower Rev Pos, Wipe Area or Upper Rev Pos	Store Are/Lower Rev Pos: Lower reverse position or lower Wipe Area: Between lower reverse position and upper reverse position Upper Rev Pos: Upper reverse position	-
Wiper Position	Windshield wiper motor assembly position	Store Are, Exchange Position or Wipe Area	Store Are: Out of wiper operating range Exchange Position: Within wiper maintenance position Wipe Area: Within wiper operating range	-
Status of Motor Lock	Windshield wiper motor assembly status	Normal or Lock	Normal: Operating normally Lock: Malfunctioning	-
Status of Temperature Protection	Windshield wiper motor assembly temperature protection	Normal, LO Operation, INT Operation or Stop	Normal: Windshield wiper motor assembly temperature is below 95°C (203°F) LO Operation: Windshield wiper motor assembly temperature is 95°C (203°F) or more INT Operation: Windshield wiper motor assembly temperature is 100°C (212°F) or more Stop: Windshield wiper motor assembly temperature is 105°C (221°F) or more	-
Status of Overvoltage	Windshield wiper motor assembly over voltage status	Normal or Overvoltage	Normal: Operating normally Overvoltage: Malfunctioning	-
Status of Low Voltage	Windshield wiper motor assembly low voltage status	Normal or Low Voltage	Normal: Operating normally Low voltage: Malfunctioning	-
Motor Shaft Angle	Windshield wiper motor assembly shaft angle status	Min.: 0° Max.: 255°	Almost the same as actual windshield wiper motor assembly shaft angle	-
Motor Temperature	Windshield wiper motor assembly temperature status	Min.: -128°C (-198.4°F) Max.: 127°C (260.6°F)	Almost the same as actual windshield wiper motor assembly temperature	-
Motor Current	Windshield wiper motor assembly current status	Min.: 0 A Max.: 63 A	Almost the same as actual windshield wiper motor assembly current	-
Motor Power Supply Voltage	Windshield wiper motor assembly voltage status	Min.: 0 V Max.: 63 V	Almost the same as actual windshield wiper motor assembly voltage	-
Number of DTCs	Number of trouble codes	0 to 255	Number of stored DTCs displayed	-

How To Proceed With Troubleshooting

CAUTION / NOTICE / HINT

HINT:

Use the following procedure to troubleshoot the wiper and washer system.

*: Use the Techstream.

PROCEDURE

1.	VEHICLE BROUGHT TO WORKSHOP

2.	CUSTOMER PROBLEM ANALYSIS

HINT:

In troubleshooting, confirm that the problem symptoms have been accurately identified. Preconceptions should be discarded in order to make an accurate judgment. To clearly understand what the problem symptoms are, it is extremely important to ask the customer about the problem and the conditions at the time the malfunction occurred.
Gather as much information as possible for reference. Past problems that seem unrelated may also help in some cases.

The following 5 items are important points for problem analysis:

What	Vehicle model, system name
When	Date, time, occurrence frequency
Where	Road conditions
Under what conditions?	Driving conditions, weather conditions
How did it happen?	Problem symptoms

3.	READ OUT AND SAVE OPERATION HISTORY

NOTICE:

If the vehicle or vehicle controls are operated (for example, during initial inspection when the vehicle is brought in for repair) before operation history has been read out and saved, the operation history information could be lost.
The function "Read operation history" uses the current system time setting inside the Techstream and the time counter inside the controlling ECU to calculate the timings shown in the operation history. For this reason, before reading out the operation history, first make sure that the Techstream system clock is accurately set to the current time.

(a) Read out and save operation history using the Techstream.

Click here

Body Electrical > Wiper > Utility

Tester Display
Operation History

PRE-CHECK

(a) Measure the battery voltage with engine switch off.

Standard Voltage:

11 to 14 V

If the voltage is below 11 V, recharge or replace the battery before proceeding to the next step.

(b) Check the fuses and relays.

(c) Check the connector connections and terminals to make sure that there are no abnormalities such as loose connections, deformation, etc.

5.	CHECK COMMUNICATION FUNCTION OF CAN COMMUNICATION SYSTEM*

(a) Using the Techstream, check for CAN communication system DTCs.

Click here

Result	Proceed to
CAN DTCs are not output	A
CAN DTCs are output	B

GO TO CAN COMMUNICATION SYSTEM

6.	CHECK FOR DTC*

(a) Check for DTCs.

Body Electrical > Wiper > Trouble Codes Body Electrical > Main Body > Trouble Codes

Result	Proceed to
DTCs are not output	A
DTCs are output	B

GO TO DIAGNOSTIC TROUBLE CODE CHART

7.	PROBLEM SYMPTOMS TABLE

(a) Refer to Problem Symptoms Table.

Click here

Result	Proceed to
Fault is not listed in Problem Symptoms Table	A
Fault is listed in Problem Symptoms Table	B

GO TO PROBLEM SYMPTOMS TABLE

8.	OVERALL ANALYSIS AND TROUBLESHOOTING*

(a) Operation Check.

Click here

(b) Data List / Active Test

Click here

(d) Fail-safe Chart

Click here

(e) Inspection

(f) On-vehicle inspection

9.	ADJUST, REPAIR OR REPLACE

10.	CONFIRMATION TEST

END

Operation Check

OPERATION CHECK

CHECK SERVICE POSITION CONTROL

(a) Turn the engine switch off.

(b) Within approximately 45 seconds of turning the engine switch off, hold the windshield wiper switch assembly in the MIST position for 2 seconds and confirm that the wipers move to the uppermost position.

CHECK VEHICLE SPEED SENSING TYPE ADJUSTABLE INTERMITTENT WIPER CONTROL

(a) Turn the engine switch on (IG).

(b) Move the windshield wiper switch assembly to the INT position.

(c) Check that the intermittent operation interval changes between approximately 1.5 to 11 seconds according to the vehicle speed and the position of the intermittent time adjustment switch of the windshield wiper switch assembly.

CHECK INTERMITTENT CONTROL FUNCTION

(a) Turn the engine switch on (IG).

(b) Move the windshield wiper switch assembly to the INT position.

(c) Check that the intermittent operation interval can be adjusted between approximately 4 to 12.5 seconds by operating the intermittent time adjustment switch.

WASHER OPERATION INSPECTION

(a) Turn the engine switch on (IG).

(b) Check washer cooperation:

Operate the washer switch for approximately 0.5 seconds or more and check that the front wipers operate in LO and washer fluid is sprayed. Then release the washer switch and check that the front wipers operate for 3 cycles.

With the vehicle speed less than approximately 5 km/h (3 mph), operate the washer switch and check that the front wipers operate for 1 cycle approximately 3 seconds after washer cooperation completes.

CHECK WASHER FLUID LEVEL LOW WARNING

(a) Check that when the volume of washer fluid decreases to below a certain level (the level warning switch turns on), a warning message is displayed on the multi-information display.

Parts Location

PARTS LOCATION

ILLUSTRATION

WINDSHIELD WIPER MOTOR ASSEMBLY

LEVEL WARNING SWITCH ASSEMBLY

WINDSHIELD WASHER MOTOR AND PUMP ASSEMBLY

NO. 1 ENGINE ROOM RELAY BLOCK AND NO. 1 JUNCTION BLOCK ASSEMBLY

- WIPER FUSE

- WIPER RELAY

- WASHER RELAY

ILLUSTRATION

*1	STEERING WHEEL SWITCH HOUSING	*2	WINDSHIELD WIPER SWITCH ASSEMBLY
*3	STEERING SENSOR	*4	COMBINATION METER ASSEMBLY
*5	MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU)	*6	INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY - WASHER FUSE
*7	DLC3	-	-

Precaution

PRECAUTION

PRECAUTION FOR DISCONNECTING CABLE FROM NEGATIVE BATTERY TERMINAL

NOTICE:

When disconnecting the cable from the negative (-) battery terminal, initialize the following systems after the cable is reconnected.

System Name	See Procedure
Lane Departure Alert System (w/ Steering Control)
Intelligent Clearance Sonar System
Parking Assist Monitor System
Panoramic View Monitor System
Pre-collision System
Lighting System (for Gasoline Model with Cornering Light)

PRECAUTION FOR WASHER NOZZLE ADJUSTMENT

(a) Do not clean or adjust the washer nozzle with a safety pin, etc. because:

(1) The washer nozzle tip is made of resin and may be damaged.

(2) Adjustment is not necessary for this spray type washer nozzle. If it is necessary to change the nozzle angle, replace the washer nozzle with one that has a different nozzle angle.

Click here

(b) If the washer nozzle is clogged with wax, etc., remove it and clean the nozzle hole with a soft resin brush or other cleaning tool.

Problem Symptoms Table

PROBLEM SYMPTOMS TABLE

NOTICE:

Before replacing the main body ECU (multiplex network body ECU), refer to Registration.

Click here

HINT:

Use the table below to help determine the cause of problem symptoms. If multiple suspected areas are listed, the potential causes of the symptoms are listed in order of probability in the "Suspected Area" column of the table. Check each symptom by checking the suspected areas in the order they are listed. Replace parts as necessary.
Inspect the fuses and relays related to this system before inspecting the suspected areas below.

Front Wiper and Washer System

Symptom	Suspected Area	Link
Front wipers do not operate at all	Proceed to "Wiper and Washer Switch Circuit"
Front wipers do not operate at all	Windshield wiper motor assembly
Front wipers do not operate in INT	Proceed to "Wiper and Washer Switch Circuit"
Front wipers do not operate in LO	Proceed to "Wiper and Washer Switch Circuit"
Front wipers do not operate in HI	Proceed to "Wiper and Washer Switch Circuit"
Front wipers do not operate in MIST	Proceed to "Wiper and Washer Switch Circuit"
When the wiper switch is in the INT position, the front wiper intermittent operation interval cannot be adjusted by the intermittent time adjustment switch	Proceed to "Wiper and Washer Switch Circuit"
	Windshield wiper motor assembly
When the front wipers are operating in INT, the front wiper intermittent operation interval does not change according to changes in the vehicle speed	Windshield wiper motor assembly
Front wipers continuously operate in LO	Proceed to "Wiper and Washer Switch Circuit"
Front wipers continuously operate in HI	Proceed to "Wiper and Washer Switch Circuit"
Front wipers continuously operate in INT	Windshield wiper motor assembly
"Wiper System Malfunction Visit Your Dealer" is displayed on the multi-information display	Windshield wiper motor assembly
	Main body ECU (Multiplex network body ECU)
	Combination meter assembly
Front wipers do not move to the service position (wiper operation is normal)	Main body ECU (Multiplex network body ECU)
Windshield washer motor and pump assembly does not operate	Proceed to "Washer Motor Circuit"
Windshield washer motor and pump assembly does not operate	Proceed to "Wiper and Washer Switch Circuit"
Washer fluid does not flow (Windshield washer motor and pump assembly is normal)	Washer fluid	-
	Washer hose and nozzle	-
When the front wiper switch is turned off, the front wipers do not move to the park position or stop in the wrong position	Check the automatic stop (park) position
	Main body ECU (Multiplex network body ECU)
Front wipers did not operate before, but operate now	Check the Operation History

Washer Fluid Level Warning System

Symptom	Suspected Area	Link
"Windshield Washer Fluid Low" is displayed on the multi-information display when washer fluid level is not low	Proceed to "Washer Fluid Level Warning Switch Circuit"
"Windshield Washer Fluid Low" is not displayed on the multi-information display when washer fluid level is low	Washer fluid	-
	Proceed to "Washer Fluid Level Warning Switch Circuit"

System Description

SYSTEM DESCRIPTION

FRONT WIPER AND WASHER CONTROL FUNCTION

Control/Function	Description
Wiper speed regulation	Maintains the default speed of the wipers even when the supply voltage or resistance changes.
Wiper speed HI to LO transition control	Smoothly controls the change in speed of the wipers when the wiper speed is changed from HI to LO.
Service position control	Stops the front wipers at the top of their stroke when the windshield wiper switch assembly is held in the MIST position for 2 seconds or more within approximately 45 seconds after the engine switch is turned off. HINT: The front wipers can be returned from the service position by turning the engine switch on (IG) and operating the windshield wiper switch assembly. If the MIST function is operated when the front wipers are in the service position, the front wipers will return to the park position. The front wipers must be in the service position when locking them back*.
Engine hood interference damage reduction function	Operates the windshield wiper motor assembly at a slow speed for the first cycle when returning from the service position to minimize damage to the engine hood if a wiper arm is still in the lock-back position. Moves the wipers a short distance in reverse if a wiper arm in the lock-back position contacts the engine hood and the windshield wiper motor locks up.
Self-locking control	Holds the wipers in the park position when the engine switch is on (IG).
Protection mode	Limits the operation of the windshield wiper motor assembly when excessive load is detected, in order to protect the wiper and washer system. Refer to Fail-safe chart. Click here
MIST function	Operates the wipers in LO when the windshield wiper switch assembly is held in the MIST position.
Vehicle speed sensing type adjustable intermittent wiper control	Controls the delay of the front wipers when the windshield wiper switch assembly is in the INT position. HINT: The intermittent operation interval is controlled by the intermittent time adjustment switch of the windshield wiper switch assembly. The intermittent operation interval of delay changes in accordance with the vehicle speed. When the windshield wiper switch assembly is in the INT position and the vehicle is stopped, the wipers operate for 1 cycle when the vehicle starts off. When the intermittent time adjustment switch is moved to a faster position, the delay is reset and control begins according to the new setting.
Washer cooperation	When the washer switch is operated for 0.5 seconds or more, the front wipers operate in LO. When the washer switch is released, the front wipers operate in LO for 3 additional cycles. NOTICE: If the washer switch is operated for approximately 40 seconds or more, operation of the windshield washer motor and pump assembly is stopped to prevent burnout, and the front wipers are returned to the park position.
Drip prevention wiper function	Approximately 3 seconds after washer cooperation completes, operates the front wipers for 1 cycle to remove any remaining washer fluid. HINT: This function only operates when the vehicle is stationary and will stop operating at a vehicle speed of approximately 5 km/h (3 mph) or more.
Vehicle stopped wiper control	If the vehicle is stopped and the windshield wiper switch assembly is moved to the LO position, the front wipers will operate in LO for 3 cycles and then at a 2.5 second interval.

*: Function that allows the front wiper arms to be folded back such as when replacing the wiper rubber.

OTHER FUNCTIONS

Control/Function	Description
Washer fluid level low warning	Displays "Windshield Washer Fluid Low" on the multi-information display in the combination meter assembly when the washer fluid level is low.
Wiper system warning	Displays "Wiper System Malfunction Visit Your Dealer" on the multi-information display in the combination meter assembly when the wiper and washer system is malfunctioning.

System Diagram

SYSTEM DIAGRAM

FRONT WIPER AND WASHER SYSTEM

WASHER FLUID LEVEL WARNING SYSTEM

Terminals Of Ecu

TERMINALS OF ECU

CHECK WINDSHIELD WIPER MOTOR ASSEMBLY

(a) Disconnect the A26 windshield wiper motor assembly connector.

(b) Measure the voltage and resistance on the wire harness side connector according to the value(s) in the table below.

Terminal No. (Symbol)	Wiring Color	Terminal Description	Condition	Specified Condition
A26-1 (GND) - Body ground	W-B - Body ground	Ground	Always	Below 1 Ω
A26-4 (+B) - Body ground	SB - Body ground	Engine switch on (IG) signal (Power source circuit)	Engine switch on (IG)	11 to 14 V
			Less than approximately 60 seconds after engine switch turned off	11 to 14 V
			Approximately 60 seconds or more after engine switch turned off	Below 1 V

HINT:

Since the A26 windshield wiper motor assembly connector is a waterproof type connector, the voltage and pulses cannot be checked directly. The values listed are for reference only.

(d) Measure the voltage and check for pulses according to the value(s) in the table below.

Terminal No.

(Symbol)

Wiring Color

Terminal Description

Condition

Specified Condition

A26-2 (LIN) - Body ground

R - Body ground

LIN communication signal

Engine switch on (IG)

Pulse generation

A26-3 (2S) - Body ground

B - Body ground

Windshield wiper motor assembly HI operation signal

Windshield wiper motor assembly stopped

4.8 to 5.2 V

Windshield wiper motor assembly operating in HI

Below 1 V

CHECK MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU) AND INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY

(a) Disconnect the instrument panel junction block assembly and main body ECU (multiplex network body ECU) connectors.

(b) Measure the voltage and resistance according to the value(s) in the table below.

Terminal No. (Symbol)	Wiring Color	Terminal Description	Condition	Specified Condition
4D-3 - Body ground	LA - Body ground	Ground	Always	Below 1 Ω
4F-1 - Body ground	LG - Body ground	Battery power supply	Always	11 to 14 V
4K-1 - Body ground	W - Body ground	Battery power supply	Always	11 to 14 V

(d) Measure the voltage and check for pulses according to the value(s) in the table below.

Terminal No. (Symbol)	Wiring Color	Terminal Description	Condition	Specified Condition
4F-2 - Body ground	R - Body ground	Washer circuit IG power source	Engine switch on (IG)	11 to 14 V
G32-3 (LIN3) - Body ground	BE - Body ground	LIN communication line	Engine switch on (IG)	Pulse generation
G32-12 (FWSR) - Body ground	L - Body ground	WASHER Relay operation signal	Engine switch on (IG), front washer switch off	11 to 14 V
G32-12 (FWSR) - Body ground	L - Body ground	WASHER Relay operation signal	Engine switch on (IG), front washer switch on	Below 2 V
G33-21 (WPS) - Body ground	LG - Body ground	WIPER Relay operation signal	Engine switch on (IG)	11 to 14 V
			Less than approximately 60 seconds after engine switch turned off	11 to 14 V
			Approximately 60 seconds or more after engine switch turned off	Below 1 V

CHECK COMBINATION METER ASSEMBLY

Click here

Utility

UTILITY

OPERATION HISTORY

HINT:

History of Reason for Operation: The windshield wiper motor assembly stores Operation History which can be read using the Techstream, when a malfunction of the wiper and washer system occurs.

Click here

(a) Connect the Techstream to the DLC3.

(b) Turn the engine switch on (IG).

(d) Enter the following menus: Body Electrical / Wiper / Utility.

(e) Following the instructions on the screen, save the operation history.

Body Electrical > Wiper > Utility

Tester Display
Operation History

WIPER SPECIFICATION SWITCH

HINT:

This item is displayed on the Techstream, but cannot be operated as the auto wiper system is not available for this vehicle.

(a) Connect the Techstream to the DLC3.

(b) Turn the engine switch on (IG).

(d) Enter the following menus: Chassis / Steering Angle Sensor / Utility.

(e) According to the display on the Techstream, select Wiper Specification Switch.

Chassis > Steering Angle Sensor > Utility

Tester Display
Wiper Specification Switch

Washer Fluid Level Warning Switch Circuit

DESCRIPTION

When the washer fluid level is lower than a certain level, a warning message is displayed on the combination meter assembly.

WIRING DIAGRAM

PROCEDURE

1.	READ VALUE USING TECHSTREAM

(a) Connect the Techstream to the DLC3.

(b) Turn the engine switch on (IG).

(d) Enter the following menus: Body Electrical / Combination Meter / Data List.

(e) Read the Data List according to the display on the Techstream.

Body Electrical > Combination Meter > Data List

Tester Display

Measurement Item

Range

Normal Condition

Diagnostic Note

Washer Level Warning Switch

Washer fluid level warning switch

OFF or ON

OFF: Washer fluid level not low

ON: Washer fluid level low

Body Electrical > Combination Meter > Data List

Tester Display
Washer Level Warning Switch

OK:

The Techstream display changes correctly in response to the washer fluid level.

REPLACE COMBINATION METER ASSEMBLY

2.	INSPECT LEVEL WARNING SWITCH ASSEMBLY

(a) Remove the level warning switch assembly.

Click here

(b) Inspect the level warning switch assembly.

Click here

REPLACE LEVEL WARNING SWITCH ASSEMBLY

3.	CHECK HARNESS AND CONNECTOR (LEVEL WARNING SWITCH ASSEMBLY - COMBINATION METER ASSEMBLY)

(a) Disconnect the G16 combination meter assembly connector.

(b) Measure the resistance according to the value(s) in the table below.

Standard Resistance:

Tester Connection	Condition	Specified Condition
A3-1 - G16-17 (WLVL)	Always	Below 1 Ω
A3-1 or G16-17 (WLVL) - Body ground	Always	10 kΩ or higher

REPAIR OR REPLACE HARNESS OR CONNECTOR

4.	CHECK HARNESS AND CONNECTOR (LEVEL WARNING SWITCH ASSEMBLY - BODY GROUND)

(a) Measure the resistance according to the value(s) in the table below.

Standard Resistance:

Tester Connection	Condition	Specified Condition
A3-2 - Body ground	Always	Below 1 Ω

REPLACE COMBINATION METER ASSEMBLY

REPAIR OR REPLACE HARNESS OR CONNECTOR

Washer Motor Circuit

DESCRIPTION

When the windshield washer motor and pump assembly receives signals from the windshield wiper switch assembly, it operates to spray washer fluid from the washer nozzle sub-assemblies.

WIRING DIAGRAM

CAUTION / NOTICE / HINT

NOTICE:

Inspect the fuses for circuits related to this system before performing the following procedure.
Before replacing the main body ECU (multiplex network body ECU), refer to Registration.
Click here

PROCEDURE

1.	PERFORM ACTIVE TEST USING TECHSTREAM

(a) Connect the Techstream to the DLC3.

(b) Turn the engine switch on (IG).

(d) Enter following menus: Body Electrical / Main Body / Active Test.

(e) Perform the Active Test according to the display on the Techstream.

Body Electrical > Main Body > Active Test

Tester Display	Measurement Item	Control Range	Diagnostic Note
Front Washer Relay	Function to operate the windshield washer motor and pump assembly	OFF or ON	-

Body Electrical > Main Body > Active Test

Tester Display
Front Washer Relay

OK:

Windshield washer motor and pump assembly operates normally.

PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE

2.	INSPECT WINDSHIELD WASHER MOTOR AND PUMP ASSEMBLY

(a) Remove the windshield washer motor and pump assembly.

Click here

(b) Inspect the windshield washer motor and pump assembly.

Click here

REPLACE WINDSHIELD WASHER MOTOR AND PUMP ASSEMBLY

3.	INSPECT WASHER RELAY

(a) Inspect the WASHER relay.

Click here

REPLACE WASHER RELAY

4.	CHECK HARNESS AND CONNECTOR (POWER SOURCE - WASHER RELAY)

(a) Measure the voltage according to the value(s) in the table below.

Standard Voltage:

Tester Connection	Condition	Specified Condition
1 (WASHER relay) - Body ground	Engine switch off	Below 1 V
1 (WASHER relay) - Body ground	Engine switch on (IG)	11 to 14 V

REPAIR OR REPLACE HARNESS OR CONNECTOR

5.	CHECK HARNESS AND CONNECTOR (POWER SOURCE - WINDSHIELD WASHER MOTOR AND PUMP ASSEMBLY)

(a) Measure the voltage according to the value(s) in the table below.

Standard Voltage:

Tester Connection	Condition	Specified Condition
A27-1 (B) - Body ground	Engine switch off	Below 1 V
A27-1 (B) - Body ground	Engine switch on (IG)	11 to 14 V

REPAIR OR REPLACE HARNESS OR CONNECTOR

6.	CHECK HARNESS AND CONNECTOR (WASHER RELAY - WINDSHIELD WASHER MOTOR AND PUMP ASSEMBLY)

(a) Measure the resistance according to the value(s) in the table below.

Standard Resistance:

Tester Connection	Condition	Specified Condition
5 (WASHER relay) - A27-2 (SW)	Always	Below 1 Ω
5 (WASHER relay) or A27-2 (SW) - Body ground	Always	10 kΩ or higher

REPAIR OR REPLACE HARNESS OR CONNECTOR

7.	CHECK HARNESS AND CONNECTOR (WASHER RELAY - BODY GROUND)

(a) Measure the resistance according to the value(s) in the table below.

Standard Resistance:

Tester Connection	Condition	Specified Condition
3 (WASHER relay) - Body ground	Always	Below 1 Ω

REPAIR OR REPLACE HARNESS OR CONNECTOR

8.	CHECK HARNESS AND CONNECTOR (WASHER RELAY - MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU))

(a) Disconnect the G32 main body ECU (multiplex network body ECU) connector.

(b) Measure the resistance according to the value(s) in the table below.

Standard Resistance:

Tester Connection	Condition	Specified Condition
2 (WASHER relay) - G32-12 (FWSR)	Always	Below 1 Ω
2 (WASHER relay) or G32-12 (FWSR) - Body ground	Always	10 kΩ or higher

REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU)

REPAIR OR REPLACE HARNESS OR CONNECTOR

Wiper and Washer Switch Circuit

DESCRIPTION

The condition of the windshield wiper switch assembly is detected and sent to the steering sensor in this circuit.

WIRING DIAGRAM

PROCEDURE

1.	READ VALUE USING TECHSTREAM

(a) Connect the Techstream to the DLC3.

(b) Turn the engine switch on (IG).

(d) Enter the following menus: Chassis / Steering Angle Sensor / Data List.

(e) Read the Data List according to the display on the Techstream.

Chassis > Steering Angle Sensor > Data List

Tester Display	Measurement Item	Range	Normal Condition	Diagnostic Note
Wiper OFF Switch	Front wiper switch OFF position signal	OFF or ON	OFF: Front wiper switch not in OFF position ON: Front wiper switch in OFF position	-
Wiper Auto/Int Switch	Front wiper switch INT position signal	OFF or ON	OFF: Front wiper switch not in INT position ON: Front wiper switch in INT position	-
Wiper Lo Switch	Front wiper switch LO position signal	OFF or ON	OFF: Front wiper switch not in LO position ON: Front wiper switch in LO position	-
Wiper Hi Switch	Front wiper switch HI position signal	OFF or ON	OFF: Front wiper switch not in HI position ON: Front wiper switch in HI position	-
Wiper Mist Switch	Front wiper switch MIST position signal	OFF or ON	OFF: Front wiper switch not in MIST position ON: Front wiper switch in MIST position	-
Washer Switch	Washer switch ON position signal	OFF or ON	OFF: Front washer switch not in ON position ON: Front washer switch in ON position	-
Intermittent Time Volume	Intermittent time adjustment switch condition	Shortest, Shorter, Longer, Longest	Shortest: P4 Shorter: P3 Longer: P2 Longest: P1	*

*: Refer to Inspection for each position of the switch.
Click here

Chassis > Steering Angle Sensor > Data List

Tester Display
Wiper OFF Switch
Wiper Auto/Int Switch
Wiper Lo Switch
Wiper Hi Switch
Wiper Mist Switch
Washer Switch
Intermittent Time Volume

OK:

The Techstream display changes correctly in response to the windshield wiper switch assembly operation.

PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE

2.	INSPECT WINDSHIELD WIPER SWITCH ASSEMBLY

(a) Remove the windshield wiper switch assembly.

Click here

(b) Inspect the windshield wiper switch assembly.

Click here

REPLACE WINDSHIELD WIPER SWITCH ASSEMBLY

3.	INSPECT STEERING WHEEL SWITCH HOUSING

(a) Remove the steering wheel switch housing.

Click here

(b) Inspect the steering wheel switch housing.

Click here

REPLACE STEERING SENSOR

REPLACE STEERING WHEEL SWITCH HOUSING

Wiper Motor Power Source Circuit

DESCRIPTION

This circuit is the power source circuit for the windshield wiper motor assembly.

WIRING DIAGRAM

CAUTION / NOTICE / HINT

NOTICE:

Inspect the fuses of circuits related to this system before performing the following procedure.
Before replacing the main body ECU (multiplex network body ECU), refer to Registration.
Click here

PROCEDURE

1.	READ VALUE USING TECHSTREAM

(a) Connect the Techstream to the DLC3.

(b) Turn the engine switch on (IG).

(d) Enter the following menus: Body Electrical / Wiper / Data List.

(e) Read the Data List according to the display on the Techstream.

Body Electrical > Wiper > Data List

Tester Display

Measurement Item

Range

Normal Condition

Diagnostic Note

Motor Power Supply Voltage

Front wiper motor assembly supply voltage status

Min.: 0 V

Max.: 63 V

Almost the same as actual front wiper motor assembly voltage

Body Electrical > Wiper > Data List

Tester Display
Motor Power Supply Voltage

OK:

The Techstream display is normal.

PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE

2.	CHECK HARNESS AND CONNECTOR (WINDSHIELD WIPER MOTOR ASSEMBLY - BODY GROUND)

(a) Disconnect the A26 windshield wiper motor assembly connector.

(b) Measure the resistance according to the value(s) in the table below.

Standard Resistance:

Tester Connection	Condition	Specified Condition
A26-1 (GND) - Body ground	Always	Below 1 Ω

REPAIR OR REPLACE HARNESS OR CONNECTOR

3.	CHECK HARNESS AND CONNECTOR (POWER SOURCE - WINDSHIELD WIPER MOTOR ASSEMBLY)

(a) Measure the voltage according to the value(s) in the table below.

Standard Voltage:

Tester Connection	Condition	Specified Condition
A26-4 (+B) - Body ground	Engine switch on (IG)	11 to 14 V
	Less than approximately 60 seconds after engine switch turned off	11 to 14 V
	Approximately 60 seconds or more after engine switch turned off	Below 1 V

REPLACE WINDSHIELD WIPER MOTOR ASSEMBLY

4.	INSPECT WIPER RELAY

(a) Inspect the WIPER relay.

Click here

REPLACE WIPER RELAY

5.	CHECK HARNESS AND CONNECTOR (POWER SOURCE - WIPER RELAY)

(a) Measure the voltage according to the value(s) in the table below.

Standard Voltage:

Tester Connection	Condition	Specified Condition
3 (WIPER relay) - Body ground	Always	11 to 14 V

REPAIR OR REPLACE HARNESS OR CONNECTOR

6.	CHECK HARNESS AND CONNECTOR (WIPER RELAY - BODY GROUND)

(a) Measure the resistance according to the value(s) in the table below.

Standard Resistance:

Tester Connection	Condition	Specified Condition
2 (WIPER relay) - Body ground	Always	Below 1 Ω

REPAIR OR REPLACE HARNESS OR CONNECTOR

7.	CHECK HARNESS AND CONNECTOR (WIPER RELAY - WINDSHIELD WIPER MOTOR ASSEMBLY)

(a) Measure the resistance according to the value(s) in the table below.

Standard Resistance:

Tester Connection	Condition	Specified Condition
5 (WIPER relay) - A26-4 (+B)	Always	Below 1 Ω
5 (WIPER relay) or A26-4 (+B) - Body ground	Always	10 kΩ or higher

REPAIR OR REPLACE HARNESS OR CONNECTOR

8.	CHECK HARNESS AND CONNECTOR (WIPER RELAY - MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU))

(a) Disconnect the G33 main body ECU (multiplex network body ECU) connector.

(b) Measure the resistance according to the value(s) in the table below.

Standard Resistance:

Tester Connection	Condition	Specified Condition
1 (WIPER relay) - G33-21 (WPS)	Always	Below 1 Ω
1 (WIPER relay) or G33-21 (WPS) - Body ground	Always	10 kΩ or higher

REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU)

REPAIR OR REPLACE HARNESS OR CONNECTOR

Washer Nozzle

Wiper And Washer System(for Hv Model)

See More:

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