Headlamp Switch Input Failure

Test 1 - 3:

Test 4 - 8:

Test 9 - 11:

SYMPTOM
HEADLAMP SWITCH INPUT FAILURE

WHEN MONITORED
Ignition in run position.

SET CONDITION
The BCM detects excessive current on the fog lamp relay control circuit.

POSSIBLE CAUSES
- Body control module
- Headlamp switch return wire open
- Headlamp switch MUX wire short to battery
- Headlamp switch MUX wire open
- Headlamp switch MUX wire shorted to ground
- Headlamp switch
- Headlamp switch
- Body control module
- Body control module