Voltage is applied at all times to the fog lamp relay that is soldered to the Underhood Fuseblock. When the fog lamp switch is placed in the ON position, ground is applied to the body control module (BCM) through the fog lamp switch circuit. The BCM then applies a ground to the front fog lamp relay control circuit. This engages the fog lamp relay and applies voltage through the fog lamp fuse to the front fog lamps.

There are certain relays that are PCB or soldered to the underhood fuseblock circuit board and any relay replacement would warrant a replacement of the underhood fuseblock.

The ignition is ON. Park lamps must be ON and the fog lamps must be commanded ON.

The BCM detects a short to voltage on the front fog lamp relay control circuit while trying to apply a ground to the circuit.

The fog lamps do not illuminate.

The BCM clears this code from current when the fault is removed from the system.

Schematic Reference

Fog Lights Schematics

Connector End View Reference

Lighting Systems Connector End Views

Electrical Information Reference

Scan Tool Reference

Ignition ON, turn the park lamps ON. Press the front fog lamp switch. The front fog lamps should illuminate.

1. Clear the DTC. Park lamp switch OFF, fog lamp switch OFF. Disconnect the underhood fuseblock terminal C2 pin 19. Using a test lamp connected to ground, probe the fog lamp control circuit. Verify the test lamp illuminates.

⇒	If the test lamp does not illuminate, replace the Underhood Fuseblock.

2. Test for a short to voltage in the fog lamp control circuit, Underhood Fuseblock terminal C2 pin 19.

⇒	If all circuits/connections test normal, replace the BCM.

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.