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Avalon & Supra

Disconnect light failure sensor 12-pin connector. Light failure sensor is located behind left rear quarter trim panel. Check for continuity or voltage between ground and light failure sensor wiring harness connector terminals. See LIGHT FAILURE SENSOR CIRCUIT  table. See Fig 1. If continuity or voltage is not as specified, check and repair wiring harness as necessary.

LIGHT FAILURE SENSOR CIRCUIT

Terminal (1) Condition Value
1 Always (2) Continuity
2 Always (2) Continuity
9 Always (2) Continuity
10 Always (2) Continuity
11 Always (2) Continuity
12 Always (2) Continuity
3 Light Control Switch Off Zero Volts
Light Control Switch On Battery Voltage
4 Ignition Switch Lock Or ACC Zero Volts
Ignition Switch On Battery Voltage
7 Stoplight Switch Off Zero Volts
Stoplight Switch On Battery Voltage
8 Ignition Switch Lock Or ACC Zero Volts
Ignition Switch On Battery Voltage
(1) Check for resistance or voltage between ground and light failure sensor wiring harness connector terminal listed.
(2) Continuity exists because circuit is grounded through bulb.
Fig 1: Identifying Light Failure Sensor Wiring Harness Connector Terminals (Avalon & Supra)
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