Pinpoint Test S: The Fog Lamp On Indicator Is Inoperative

Fog Lamps

Pinpoint Tests

Pinpoint Test S: The Fog Lamp On Indicator Is Inoperative

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

Normal Operation

When the fog lamp relay is energized, the Bussed Electrical Center (BEC) routes voltage through circuit 2024 (VT/OG) to the headlamp switch.

This pinpoint test is intended to diagnose the following:

- Wiring, terminals or connectors
- Headlamp switch
- BEC



PINPOINT TEST S: THE FOG LAMPS ON INDICATOR 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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S1 CHECK CIRCUIT 2024 (VT/OG) FOR VOLTAGE


- Ignition OFF.
- Disconnect: Headlamp Switch C205.
- Enter the following diagnostic mode on the scan tool: SJB DataLogger.
- Select the SJB fog lamp relay (FOG_RLY) active command. Command the fog lamps on.
- Measure the voltage between the headlamp switch C205-3, circuit 2024 (VT/OG), harness side and ground.




- Is the voltage greater than 10 volts?

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

No
GO to S2.

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S2 CHECK CIRCUIT 2024 (VT/OG) FOR AN OPEN


- Disconnect: BEC C1035a.
- Measure the resistance between the BEC C1035a-B7, circuit 2024 (VT/OG), harness side and the headlamp switch C205-3, circuit 2024 (VT/OG), harness side.




- Is the resistance less than 5 ohms?

Yes
INSTALL a new BEC. TEST the system for normal operation.

No
REPAIR the circuit. TEST the system for normal operation.

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