Test R: The Fog Lamps Are On Continuously

PINPOINT TEST R: THE FOG LAMPS ARE ON CONTINUOUSLY

R1-R2:

R3-R8:

R9:

Normal Operation
The smart junction box (SJB) sends a voltage reference signal to the headlamp switch through circuit 1669 (OG/LG). When the fog lamp switch is engaged, the voltage signal is routed to ground. The fog lamp relay is provided voltage through the bussed electrical center (BEC). When the parking lamps are on and the SJB detects a request for the fog lamps, the SJB provides a ground for the fog lamp relay coil through circuit 1347 (DB/WH). When the relay is energized, voltage is routed through circuits 1721 (LB/BK) and 1776 (TN/OG) to the LH and RH fog lamps, respectively.

Possible Causes
- Circuit 1347 (DB/WH) short to ground
- Circuit 1669 (OG/LG) short to ground
- Circuit 1721 (LB/BK) short to voltage
- Circuit 1776 (TN/OG) short to voltage
- Circuit 2024 (VT/OG) short to voltage
- Fog lamp relay
- Headlamp switch
- BEC
- SJB