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Light Failure Sensor Circuit

Disconnect light failure sensor 12-pin connector, located in trunk compartment. Check for continuity or voltage between ground and specified terminals. See LIGHT FAILURE SENSOR CIRCUIT TEST  table. If values are as specified, replace light failure sensor. If values are not as specified, check and repair wiring harness as necessary.

LIGHT FAILURE SENSOR CIRCUIT TEST

Terminal No. (1) Condition Value
1 Always (2) Continuity
2 Always (2) Continuity
3 Light Control Switch: OFF No Voltage
3 Light Control Switch: TAIL Or HEAD Battery Voltage
4 Ignition: OFF Or ACC No Voltage
4 Ignition: ON Battery Voltage
7 Stoplight Switch: OFF No Voltage
7 Stoplight Switch: ON Battery Voltage
8 Ignition: OFF Or ACC No Voltage
8 Ignition: ON Battery Voltage
9 Always (2) Continuity
10 Always (2) Continuity
11 Always (2) Continuity
12 Always (2) Continuity
(1) See illustration for terminal identification. See Fig 1.
(2) Small resistance due to bulb element.
Fig 1: Identifying Light Failure Sensor Harness Connector Terminals
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