Test S: The Fog Lamps Are On Continuously

PINPOINT TEST S: THE FOG LAMPS ARE ON CONTINUOUSLY

S1-S4:

S5-S6:

Normal Operation
The smart junction box (SJB) sends a reference signal to the headlamp switch through circuit CLF29 (BN) to monitor the fog lamp request. When the fog lamp switch is engaged, the voltage signal is routed to ground.

When the SJB detects the fog lamps on request, the SJB provides ground to the fog lamp relay coil (integral to the SJB). When the fog lamp relay is energized, voltage is routed through circuit CLF21 (GY/VT) to the fog lamps and to circuit CLF28 (BN/WH) to the headlamp switch for the fog lamps on indicator.

DTC B2254 - is an on-demand DTC that sets when the SJB detects a short to ground on the fog lamp on input circuit.

Possible Causes
- Circuit CLF21 (GY/VT) short to voltage
- Circuit CLF28 (BN/WH) short to voltage
- Circuit CLF29 (BN) short to ground
- Headlamp switch
- SJB