Test R: The Fog Lamps Are Inoperative

PINPOINT TEST R: THE FOG LAMPS ARE INOPERATIVE

R1-R3:

R4-R6:

R6-R8:

R8-R9:

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, the LCM provides voltage to the fog lamp relay coil through circuit 1347 (DB/WH). Ground for the fog lamp relay coil is provided through circuit 57 (BK). Voltage for the fog lamps is provided by the battery junction box (BJB) through circuit 1669 (OG/LG). When the fog lamp relay is energized, voltage is routed to the fog lamps through circuit 478 (TN/OG).

Possible Causes
- Fuse
- Circuit 57 (BK) open
- Circuit 477 (LB/BK) open
- Circuit 478 (TN/OG) open
- Circuit 1347 (DB/WH) open or short to ground
- Circuit 1669 (OG/LG) open
- Fog lamp relay
- Headlamp switch
- LCM