Toyota Avalon (XX50): Relay

On-vehicle Inspection

ON-VEHICLE INSPECTION

PROCEDURE

1. INSPECT DEF RELAY

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

Standard Resistance:

Tester Connection	Condition	Specified Condition
3 - 4	Auxiliary battery voltage applied between terminals 1 and 2	10 kΩ or higher
3 - 4	Auxiliary battery voltage not applied between terminals	Below 1 Ω
3 - 5	Auxiliary battery voltage applied between terminals 1 and 2	Below 1 Ω
3 - 5	Auxiliary battery voltage not applied between terminals	10 kΩ or higher
4 - 5	Always	10 kΩ or higher

If the result is not as specified, replace the DEF relay.

Toyota Avalon (XX50) 2019-2022 Service & Repair Manual > Hybrid Control System: Hybrid/EV Battery Sensor Module Internal Electronic Failure (P0AFC49). Hybrid/EV Battery Sensor Module Signal Compare Failure (P0AFC62,...,P308A13). Hybrid/EV Battery "A" Voltage Sensor Voltage Out of
Hybrid/EV Battery Sensor Module Internal Electronic Failure (P0AFC49) DTC SUMMARY MALFUNCTION DESCRIPTION When the hybrid control system is activated, the hybrid vehicle control ECU checks the power supply voltage of the battery voltage sensor and detects malfunction. The cause of this malfunction m ...