Light Failure Sensor Circuit Tests
WARNING: This page is about a different car, the 2002 Toyota Avalon. However, it is still accessible from the selected car via links, so may be relevant.
Turn ignition off. Disconnect 12-pin electrical harness connector from light failure sensor. Light failure sensor is located in left rear corner of luggage compartment. Using a DVOM, check continuity between specified terminals of 12-pin light failure sensor electrical harness connector. See Fig 1. See LIGHT FAILURE SENSOR CIRCUIT SPECIFICATIONS table. If circuits are not as specified, check wiring harness connections at other components. If circuits are as specified, replace light failure sensor. See LIGHT FAILURE SENSOR under REMOVAL & INSTALLATION.
LIGHT FAILURE SENSOR CIRCUIT SPECIFICATIONS
| DVOM Test Points | Condition | Specification | |||
|---|---|---|---|---|---|
| Check Continuity Between Body Ground & Specified Harness Connector Terminal | |||||
| 1 | Under All Conditions | (1) Continuity | |||
| 2 | Under All Conditions | (1) Continuity | |||
| 9 | Under All Conditions | (1) Continuity | |||
| 10 | Under All Conditions | (1) Continuity | |||
| 11 | Under All Conditions | Continuity | |||
| 12 | Under All Conditions | (1) Continuity | |||
| Check Voltage Between Body Ground & Specified Terminal | |||||
| 3 | Light Control Switch In OFF Position | No Voltage | |||
| 3 | Light Control Switch In TAIL Or HEAD Position | Battery Voltage | |||
| 4 & 8 | Ignition Switch In LOCK Or ACC Position | No Voltage | |||
| 4 & 8 | Ignition Switch In ON Position | Battery Voltage | |||
| 7 | Brakelight Switch Off | No Voltage | |||
| 7 | Brakelight Switch On | Battery Voltage | |||
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