Pinpoint Test V: An Individual Rear Fog Lamp Is Inoperative

Fog Lamps

Pinpoint Tests

Pinpoint Test V: An Individual Rear Fog Lamp Is Inoperative

Refer to Wiring Diagram Set 86, Fog Lamps for schematic and connector information. Diagrams By Number

Normal Operation

When the headlamp switch is placed in the HEADLAMPS ON position and the knob is pulled to the second detent, the headlamp switch provides voltage to the rear fog lamps.

NOTE: If the vehicle is not equipped with front fog lamps, the second detent is not available. When the fog lamp switch is pulled to the first detent, voltage is provided to the rear fog lamps.

This pinpoint test is intended to diagnose the following:

- Wiring, terminals or connectors
- Rear lamp jumper harness


PINPOINT TEST V: AN INDIVIDUAL REAR FOG LAMP IS INOPERATIVE

NOTICE: Use the correct probe adapter(s) when making measurements. Failure to use the correct probe adapter(s) may damage the connector.

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V1 CHECK FOR VOLTAGE TO THE INOPERATIVE LAMP


- Ignition OFF.
- Disconnect: Inoperative Rear Fog Lamp.
- Ignition ON.
- Place the headlamp switch in the HEADLAMPS ON position and pull the knob to the first detent (second detent if equipped with front fog lamps).
- Measure the voltage between the LH rear lamp C414-1, circuit 15S-LD6 (GN/YE), harness side and ground; or between the RH rear lamp C417-1, circuit 15S-LD12 (GN/YE), harness side and ground.




- Is the voltage greater than 10 volts?

Yes
GO to V2.

No
REPAIR circuit 15S-LD6 (GN/YE) (LH rear fog lamp) or circuit 15S-LD12 (GN/YE) (RH rear fog lamp) for an open. TEST the system for normal operation.

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V2 CHECK FOR VOLTAGE TO THE INOPERATIVE LAMP USING THE CONNECTOR GROUND


- Measure the voltage between the LH rear lamp C414-1, circuit 15S-LD6 (GN/YE), harness side and the LH rear lamp C414-5, circuit 31-LF23 (BK), harness side; or between the RH rear lamp C417-1, circuit 15S-LD12 (GN/YE), harness side and the RH rear lamp C417-5, circuit 31-LF24 (BK), harness side.




- Is the voltage greater than 10 volts?

Yes
REPAIR or INSTALL a new rear lamp jumper harness. TEST the system for normal operation.

No
REPAIR the rear lamp ground circuit in question for an open. TEST the system for normal operation.

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