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Light Failure Sensor

Disconnect light failure sensor 12-pin connector, located in trunk. Check for continuity or voltage between ground and specified terminals. Refer to LIGHT FAILURE SENSOR CIRCUIT TEST  table. Also, see Fig 1. If values are as specified, replace light failure sensor. If values are not as specified, check and repair wiring harness as necessary. See appropriate wiring diagram in WIRING DIAGRAMS .

LIGHT FAILURE SENSOR CIRCUIT TEST

Terminal No. Condition Value
1 Always (1) Continuity
2 Always (1) Continuity
6 Always (1) Continuity
7 Always (1) Continuity
11 Always (1) Continuity
12 Always (1) Continuity
5 Light Control Switch Off No Voltage
Headlight Or Taillight On Battery Voltage
8 Ignition; Lock Or ACC No Voltage
Ignition On Battery Voltage
9 & 10 Stoplight Switch Off No Voltage
Stoplight Switch On Battery Voltage
(1) Continuity exists due to bulb in circuit.
Fig 1: Light Failure Sensor Wiring Harness Connector Terminals
G98G03723Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002