Test R: The Fog Lamps Are On Continuously

PINPOINT TEST R: THE FOG LAMPS ARE ON CONTINUOUSLY

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 ignition switch is in the ON position, 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.

- DTC B2030 (Front Fog Lamp Relay Ckt Failure) - is a continuous and on-demand DTC that sets when the SJB detects a short to ground from the fog lamp relay coil ground controlled circuit.
- DTC B2254 (Front Fog Lamp Switch Failure) - is an on-demand DTC that sets when the SJB detects a short to ground from the fog lamp switch input circuit.

This pinpoint test is intended to diagnose the following:
- Wiring, terminals or connectors
- Fog lamp relay
- Headlamp switch
- BEC
- SJB

R1-R3:

R4-R8:

R8-R9: