Test S: The Fog Lamps Are On Continuously

PINPOINT TEST S: THE FOG LAMPS ARE ON CONTINUOUSLY

S1:

S1-S5:

S6-S7:

Normal Operation
The lighting control module (LCM) sends a voltage reference signal to the headlamp switch through circuit 477 (LB/BK). When the fog lamp switch is engaged, the signal is routed to ground. When a request for the fog lamps is detected (and the exterior lamps are on), the LCM provides voltage to the fog lamp relay coil through circuit 1347 (DB/WH). When the fog lamp relay is energized, voltage is routed to the fog lamps through circuit 478 (TN/OG).

Possible Causes
- Circuit 477 (LB/BK) short to ground
- Circuit 478 (TN/OG) short to voltage
- Circuit 1347 (DB/WH) short to voltage
- Fog lamp relay
- Headlamp switch
- LCM