Pinpoint Test D: One Low Beam Headlamp Is Inoperative
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.
- D1 CHECK THE VOLTAGE TO THE INOPERATIVE HEADLAMP BULB
- Key in OFF position.
- Disconnect the inoperative headlamp.
- Place the headlamp switch in the ON position.
- Place the multifunction switch in the low beam position.
- Measure the voltage between LH headlamp C1021 (aerodynamic) or C1284 (sealed beam), circuit 160 (DB/WH), harness side or the RH headlamp C1041 (aerodynamic) or C1285 (sealed beam), circuit 161 (DG/OG), harness side and ground.
- Is the voltage greater than 10 volts?
- Yes : REPAIR circuit 57 (BK). TEST the system for normal operation.
- No : TURN the headlamp switch off. GO to D2.
- D2 CHECK THE CJB
- Disconnect: Central Junction Box (CJB) C270f.
- Place the headlamp switch in the ON position.
- Measure the voltage between CJB C270f-2, circuit 161 (DG/OG), component side and ground; or between CJB C270f-3, circuit 160 (DB/WH), component side and ground.
- Are the voltages greater than 10 volts?
- Yes : REPAIR circuit 160 (DB/WH) (LH) or 161 (DG/OG) (RH). TEST the system for normal operation.
- No : INSTALL a new CJB. TEST the system for normal operation.