Pinpoint Test X: The Reversing Lamps Are On Continuously

WARNING: This page is about a different car, the 2006 Mercury Mariner and 2006 Ford Escape. However, it is still accessible from the selected car via links, so may be relevant.

X1 CHECK CIRCUIT 140 (BK/PK) FOR A SHORT TO VOLTAGE
- Key in OFF position.
- Disconnect: SJB C2280c.
- Key in ON position.
- Do the reversing lamps continue to illuminate?
Yes: REPAIR the circuit. CLEAR the DTCs. REPEAT the self-test.

No: GO to X2.
X2 CHECK FOR VEHICLE CONTENT
- Check the vehicle and determine the type of transaxle equipped.
- Is the vehicle equipped with an automatic transaxle?
Yes: GO to X3.

No: GO to X5.
X3 CHECK THE PCM
- Key in OFF position.
- Connect: SJB C2280c.
- Disconnect: PCM C175.
- Key in ON position.
- Do the reversing lamps continue to illuminate?
Yes: : GO to X4.

No: REFER to AUTOMATIC TRANSAXLE/TRANSMISSION - CD4E or AUTOMATIC TRANSAXLE/TRANSMISSION - ELECTRONICALLY CONTROLLED CONTINUOUSLY VARIABLE TRANSMISSION (ECVT) to continue diagnosis of the transaxle.
X4 CHECK THE INSTRUMENT CLUSTER
- Key in OFF position.
- Disconnect: Instrument Cluster C220.
- Key in ON position.
- Do the reversing lamps continue to illuminate?
Yes: GO to X7.

No: GO to X8.
X5 CHECK THE REVERSING LAMP SWITCH
- Key in OFF position.
- Disconnect: Reversing Lamp Switch C169.
- Key in ON position.
- Do the reversing lamps continue to illuminate?
Yes: GO to X6.

No: INSTALL a new reversing lamp switch. REFER to REVERSING LAMP SWITCH . CLEAR the DTCs. REPEAT the self-test.
X6 CHECK CIRCUIT 1789 (VT/WH) FOR A SHORT TO GROUND
- Key in OFF position.
- Disconnect: SJB C2280b.
- Measure the resistance between the reversing lamp switch C169-1, circuit 1789 (VT/WH), harness side and ground.
  
  Fig 1: Checking Circuit 1789 (VT/WH) For Short To Ground
  Courtesy of FORD MOTOR CO.
- Is the resistance greater than 10,000 ohms?
Yes: GO to X7.

No: REPAIR the circuit. CLEAR the DTCs. REPEAT the self-test.
X7 CHECK FOR CORRECT SJB OPERATION
- Disconnect all the SJB connectors.
- Check for:
  - corrosion
  - pushed-out pins
- Connect all the SJB 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 SJB. REFER to SMART JUNCTION BOX (SJB) . 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. CLEAR the DTCs. REPEAT the self-test.
X8 CHECK FOR CORRECT INSTRUMENT CLUSTER OPERATION
- Disconnect all the instrument cluster connectors.
- Check for:
  - corrosion
  - pushed-out pins
- Connect all the 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. CLEAR the DTCs. REPEAT the self-test.