Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
Light Failure Sensor Circuit
Disconnect the connector from the sensor and inspect the connector on the wiring harness side. See CONNECTOR IDENTIFICATION . See INSPECTING LIGHT FAILURE SENSOR CIRCUIT table. If the circuit is as specified, replace the sensor. If the circuit is not as specified, inspect the circuits connected to other parts.
| Tester Connection | Condition | Specified Condition | ||
|---|---|---|---|---|
| 1 - Ground | Constant | Continuity (1) | ||
| 2 - Ground | Constant | Continuity (1) | ||
| 9 - Ground | Constant | Continuity (1) | ||
| 11 - Ground | Constant | Continuity | ||
| 3 - Ground | Light Control Switch OFF | No Voltage | ||
| 3 - Ground | Light Control Switch TAIL Or HEAD | B+ Voltage | ||
| 4 - Ground | Ignition Switch LOCK Or ACC | No Voltage | ||
| 4 - Ground | Ignition Switch ON | B+ Voltage | ||
| 7 - Ground | Stop Light Switch OFF | No Voltage | ||
| 7 - Ground | Stop Light Switch ON | B+ Voltage | ||
| 8 - Ground | Ignition Switch LOCK Or ACC | No Voltage | ||
| 8 - Ground | Ignition Switch ON | B+ Voltage | ||
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NO RELATED
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.