Pinpoint Test I: The Interior Lamps Are Inoperative From The Headlamp Switch
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.
- I1 CHECK THE HEADLAMP SWITCH
- Key in OFF position.
- Disconnect: Headlamp Switch C205b.
- Connect a fused (10A) jumper wire between the headlamp switch C205b-2, circuit 402 (OG/LG), harness side and the headlamp switch C205b-4, circuit 57 (BK), harness side.
- Do the interior lamps illuminate?
- Yes : INSTALL a new headlamp switch. REFER to EXTERIOR LIGHTING . TEST the system for normal operation.
- No : GO to I2.
- I2 CHECK CIRCUIT 402 (OG/LG) FOR AN OPEN
- Disconnect: Instrument Cluster C220b.
- Measure the resistance between the instrument cluster C220b-25, circuit 402 (OG/LG), harness side and the headlamp switch C205b-2.
- Is the resistance less than 5 ohms?
- Yes : GO to I3.
- No : REPAIR the circuit. TEST the system for normal operation.
- I3 CHECK CIRCUIT 57 (BK) FOR AN OPEN
- Measure the resistance between the headlamp C205b-4, circuit 57 (BK) and ground.
- Is the resistance less than 5 ohms?
- Yes : GO to I4.
- No : REPAIR the circuit. TEST the system for normal operation.
- I4 CHECK FOR CORRECT INSTRUMENT CLUSTER OPERATION
- Disconnect all instrument cluster connectors.
- Check for:
- corrosion
- pushed-out pins
- Connect all instrument cluster connectors and make sure they seat correctly.
- Operate the system and verify the concern is still present.
- Is the concern still present?
- Yes : INSTALL a new instrument cluster. REFER to INSTRUMENT CLUSTER . TEST the system for normal operation.
- No : The system is operating correctly at this time. The concern may have been caused by a loose or corroded connector.