Pinpoint Test U: The Fog Lamps Are On Continuously
WARNING: This page is about a different car, the 2005 Ford Pickup, 2005 Ford F550 Super Duty, 2005 Ford F450 Super Duty, and 2005 Ford Cab & Chassis. However, it is still accessible from the selected car via links, so may be relevant.
- U1 CHECK THE HEADLAMP SWITCH
- Disconnect: Headlamp Switch C205a.
- Do the fog lamps still illuminate?
- Yes : GO to U2.
- No : INSTALL a new headlamp switch. REFER to LAMP SWITCH - HEADLAMP . TEST the system for normal operation.
- U2 CHECK CIRCUIT 478 (TN/OG) FOR SHORT TO POWER
- Disconnect: Central Junction Box (CJB) C270h.
- Do the fog lamps still illuminate?
- Yes : REPAIR the circuit. TEST the system for normal operation.
- No : GO to U3.
- U3 CHECK THE FOG LAMP RELAY COIL SUPPLY CIRCUIT FOR SHORT TO POWER
- Disconnect: CJB C270a.
- Measure the voltage between CJB C270a-17, circuit 276 (BN), harness side and ground.
- Is any voltage indicated?
- Yes : REPAIR the circuit. TEST the system for normal operation.
- No : INSTALL a new CJB. TEST the system for normal operation.