Diesel Data: Automotive Repair

Principles Of Operation




Fog Lamps

Principles of Operation

The Central Junction Box (CJB) provides voltage at all times to the headlamp switch for the rear fog lamp functionality. When the headlamp switch is placed in the HEADLAMPS ON position (the ignition switch can be in any position) and the fog lamp switch is engaged, the headlamp switch provides voltage to the rear fog lamps.