Test S: The Fog Lamps Are Inoperative

PINPOINT TEST S: THE FOG LAMPS ARE INOPERATIVE

S1-S3:

S4-S7:

S7-S9:

S10:

Normal Operation
The smart junction box (SJB) sends a reference signal to the headlamp switch through circuit CLF21 (GY/VT). When the fog lamp switch is engaged, the voltage signal is routed to ground.

Voltage is supplied to the switched side of the fog lamp relay from the battery junction box (BJB) fuse 24 (15A) through circuit SBB24 (VT/RD).

When the SJB detects the fog lamps on request, the SJB provides voltage to the fog lamp relay coil through circuit CLF29 (BN). The fog lamp relay coil ground is provided through circuit GD121 (BK/YE). When the fog lamp relay is energized, voltage is routed through circuit CLF12 (BN/YE) to the fog lamps.

Possible Causes
- Fuse
- Circuit CLF12 (BN/YE) open
- Circuit CLF21 (GY/VT) open
- Circuit CLF28 (BN/WH) short to ground
- Circuit CLF29 (BN) open or short to ground
- Circuit GD121 (BK/YE) open
- Circuit SBB24 (VT/RD) open
- Fog lamp relay
- Headlamp switch
- SJB