Test S: The Fog Lamps Are On Continuously
PINPOINT TEST S: THE FOG LAMPS ARE ON CONTINUOUSLYNormal 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.
When the SJB detects the fog lamp on request, the SJB provides a voltage to the fog lamp relay coil through circuit CLF28 (BN/WH). The fog lamp relay coil ground is provided through circuit GD120 (BK/GN). When the fog lamp relay is energized, voltage is sent through circuit CLF12 (BN/YE) to the fog lamps.
- 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 lamps on input circuit.
- DTC B2512 (Front Fog Lamp Relay Ckt Short to Battery) - is a continuous and on-demand DTC that sets when the SJB detects a short to voltage from the fog lamp relay coil voltage supply circuit.
This pinpoint test is intended to diagnose the following:
- Wiring, terminals or connectors
- Fog lamp relay
- Headlamp switch
- SJB
S1-S5:
S6-S9:
