Pinpoint Test X: The Reversing 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.
- X1 CHECK THE REVERSING LAMP RELAY OUTPUT
- Disconnect: Reversing Lamp Relay C2257.
- Do the reversing lamps continue to illuminate?
- Yes : GO to X2.
- No : GO to X4.
- X2 CHECK THE CJB OUTPUT
- Disconnect: CJB C270g.
- Do the reversing lamps continue to illuminate?
- Yes : GO to X3.
- No : INSTALL a new CJB. TEST the system for normal operation.
- X3 CHECK CIRCUIT 140 (BK/PK) FOR A SHORT TO VOLTAGE
- Disconnect: Battery Junction Box Fuse 20 (10A).
- Do the reversing lamps continue to illuminate?
- Yes : REPAIR circuit 140 (BK/PK). TEST the system for normal operation.
- No : REPAIR circuit 963 (BK/LG). TEST the system for normal operation.
- X4 CHECK THE REVERSING LAMP RELAY
- Carry out the reversing lamp relay component test. Refer to COMPONENT TESTING .
- Is the reversing lamp relay OK?
- Yes : GO to X5.
- No : INSTALL a new reversing lamp relay. TEST the system for normal operation.
- X5 CHECK THE CJB
- Connect: Reversing Lamp Relay C2257.
- Disconnect: CJB C270f.
- Do the reversing lamps continue to illuminate?
- Yes : INSTALL a new CJB. TEST the system for normal operation.
- No : GO to X6.
- X6 CHECK CIRCUIT 324 (YE/LG) FOR A SHORT TO GROUND
- Connect: CJB C270f.
- Disconnect: PCM C175b or C1381b (Automatic Transmission).
- Disconnect: Reversing Lamp Switch C169 (Manual Transmission).
- Do the reversing lamps continue to illuminate?
- Yes : REPAIR the circuit. TEST the system for normal operation.
- No
: If equipped with a manual transmission, INSTALL a new reversing lamp switch. TEST the system for normal operation.
If equipped with an automatic transmission, GO to X7.
- X7 CHECK FOR CORRECT PCM OPERATION
- Disconnect all the PCM connectors.
- Check for:
- corrosion
- pushed-out pins
- Connect all the PCM 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 PCM. REFER to ELECTRONIC ENGINE CONTROLS - GASOLINE ENGINES or ELECTRONIC ENGINE CONTROLS - DIESEL ENGINE . 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.