Test X: The Fog Lamps Are on Continuously

PINPOINT TEST X: THE FOG LAMPS ARE ON CONTINUOUSLY

X1-X3:

X3-X7:

X8:

Normal Operation
The instrument cluster sends a voltage signal to the headlamp switch through circuit 8-LD10 (WH/BK). When the fog lamp switch is engaged, the signal is allowed to return to the instrument cluster. When the instrument cluster detects that the fog lamp switch is engaged, a signal is sent to the front electronic module (FEM) via the SCP network to command the fog lamps ON. The fog lamp relay receives power from circuits 30-LD8A (RD) and 30-LD8B (RD). The fog lamp relay coil is ground through circuit 31S-LD9 (BK/GN) to the FEM. When the FEM grounds circuit 31S-LD9 (BK/GN), the fog lamp relay is energized, switching power to circuit 30S-LD2 (RD/BU). Voltage then flows through circuits 30S-LD11 (RD/WH) and 30S-LD17 (RD/WH) to the LH and RH fog lamps, respectively.

Possible Causes
- Circuit 8-LD10 (WH/BK) short to ground
- Circuit 31S-LD9 (BK/GN) short to ground
- Circuit 30S-LD11 (RD/WH) short to power
- Circuit 30S-LD17 (RD/WH) short to power
- Circuit 30S-LD2 (RD/BU) short to power
- Fog lamp relay
- Headlamp switch
- Instrument cluster
- FEM