Pinpoint Test 3

PINPOINT TEST 3: THE FOG LAMPS ARE ON CONTINUOUSLY

Normal Operation
The smart junction box (SJB) sends a reference signal to the main light switch through circuit (BR) 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 (BR/Y) to the fog lamps and to circuit (BR/W) to the main light switch for the fog lamps on indicator.
- DTC B2254 (Front Fog Lamp Switch Failure) - is an on-demand DTC that sets when the SJB detects a short to ground on the fog lamp on input circuit.

Possible Causes
- Wiring, terminals or connectors
- Main light switch
- SJB

Diagnostic Procedure

CAUTION: Use the correct probe adapter(s) when making measurements. Failure to use the correct probe adapter(s) may damage the connector.

Step 1-Step 2:

Step 3-Step 6: