Pinpoint Test P: Both Rear Fog Lamps Are Inoperative

Fog Lamps

Pinpoint Tests

Pinpoint Test P: Both Rear Fog Lamps Are Inoperative

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

Normal Operation

The Central Junction Box (CJB) fuse 141 (10A) provides voltage at all times to the headlamp switch. When the headlamp switch is placed in the HEADLAMPS ON position and the fog lamp switch is engaged, the headlamp switch provides voltage to the rear fog lamps.

This pinpoint test is intended to diagnose the following:

- Fuse
- Wiring, terminals or connectors
- Headlamp switch



PINPOINT TEST P: BOTH REAR FOG LAMPS ARE 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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P1 CHECK FOR VOLTAGE TO THE HEADLAMP SWITCH


- Ignition OFF.
- Disconnect: Headlamp Switch C205.
- Measure the voltage between the headlamp switch C205-7, circuit 15-LD16 (GN/RD), harness side and ground.




- Is the voltage greater than 10 volts?

Yes
GO to P2.

No
VERIFY the CJB fuse 141 (10A) is OK. If OK, REPAIR circuit 15-LD16 (GN/RD) for an open. TEST the system for normal operation.

If not OK, REFER to the Wiring Diagrams to identify the possible causes of the circuit short. Diagrams By Number

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P2 BYPASS THE HEADLAMP SWITCH


- Connect a fuse jumper wire between the headlamp switch C205-7, circuit 15-LD16 (GN/RD), harness side and the headlamp switch C205-2, circuit 15S-LD6 (GN/YE), harness side.




- Do the rear fog lamps illuminate?

Yes
INSTALL a new headlamp switch. REFER to Headlamp Switch Service and Repair. TEST the system for normal operation.

No
REPAIR circuit 15S-LD6 (GN/YE) for an open. TEST the system for normal operation.

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