B2254 Code: Meaning, Causes, and Symptoms | OBD2 Codes

B2254 – Front Fog Lamp Switch Failure

 

B2254 Possible Symptoms

 

Engine Light ON (or Service Engine Soon Warning Light)

 

B2254 Possible Causes

 

Faulty Headlamp Switch,Headlamp Switch harness is open or shorted,Headlamp Switch circuit poor electrical connection,Faulty Smart Junction Box (SJB)

 

B2254 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.