Front Fog Lamp Switch Failure
Table of contents
B2254 MERCURY Possible Causes
- Faulty Headlamp Switch
- Headlamp Switch harness is open or shorted
- Headlamp Switch circuit poor electrical connection
- Faulty Smart Junction Box (SJB)
How do I fix code B2254 MERCURY?
Check the “Possible Causes” listed above. Visually inspect the related wiring harness and connectors. Check for damaged components and look for broken, bent, pushed out, or corroded connector’s pins.
Cost of diagnosing the B2254 MERCURY code
The cost of diagnosing the B2254 MERCURY code is 1.0 hour of labor. The auto repair labor rates vary by location, your vehicle’s make and model, and even your engine type. Most auto repairs shops charge between $75 and $150 per hour.
Possible Symptoms
- Engine Light ON (or Service Engine Soon Warning Light)
B2254 MERCURY Description
The Smart Junction Box (SJB) sends a voltage reference signal to the headlamp switch 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 (integrated into the SJB). When the fog lamp relay is energized, voltage is routed to the fog lamps and on a separate output to the headlamp switch for the fog lamps on indicator. The Diagnostic Trouble Code (DTC) that sets when the SJB detects a short to ground on the fog lamp on input circuit.