Pinpoint Test U: The Reversing Lamps Are Inoperative

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

U1 CHECK THE TRANSAXLE TYPE
- Key in OFF position.
- Check the transaxle type on the vehicle.
- Is the vehicle equipped with a manual transaxle?
Yes : GO to U2.

No : GO to U4.
U2 CHECK CIRCUIT CBP18 (GY/OG) FOR AN OPEN
- Disconnect: Reversing Lamp Switch C169.
- Key in ON position.
- Measure the voltage between the reversing lamp switch C169-1, circuit CBP18 (GY/OG), harness side and ground.
  
  Fig 1: Checking Circuit CBP18 (GY/OG) For Open
  Courtesy of FORD MOTOR CO.
- Is the voltage greater than 10 volts?
Yes : GO to U3.

No : VERIFY the SJB fuse 26 (7.5A) is OK. If OK, REPAIR the circuit. TEST the system for normal operation.
U3 CHECK THE REVERSING LAMP SWITCH
- Connect a fused (7.5A) jumper wire between the reversing lamp switch C169-1, circuit CBP18 (GY/OG), harness side and the reversing lamp switch C169-2, circuit CBP12 (GN/WH), harness side.
  
  Fig 2: Checking Reversing Lamp Switch
  Courtesy of FORD MOTOR CO.
- Do the reversing lamps illuminate?
Yes : INSTALL a new reversing lamp switch. REFER to REVERSING LAMP SWITCH . TEST the system for normal operation.

No : REPAIR circuit CBP12 (GN/WH). TEST the system for normal operation.
U4 MONITOR THE TRANSMISSION GEAR STATUS PID
- Apply the parking brake.
- Key in ON position.
- Enter the following diagnostic mode on the scan tool: TCM Gear Status PID.
- Monitor the TCM gear status PID while moving the gear selector lever through all positions.
- Does the PID agree with the gear selected?
Yes : GO to U5.

No : REFER to AUTOMATIC TRANSMISSION - 6 SPEED or AUTOMATIC TRANSAXLE/TRANSMISSION - FNR5 to continue diagnosis of the transaxle.
U5 MONITOR THE SJB REVERSING LAMP RELAY STATUS PID
- Enter the following diagnostic mode on the scan tool: SJB Reversing Lamp Relay Status PID.
- Monitor the SJB reversing lamp relay status PID while placing the gear selector lever in REVERSE.
- Does the PID indicate the reversing lamp relay energized?
Yes : GO to U6.

No : GO to U8.

U6 CHECK CIRCUIT CBP12 (GN/WH) FOR AN OPEN

Disconnect: Inoperative Reversing Lamp.
Disconnect: SJB C2280e.

Measure the resistance between an inoperative reversing lamp, harness side and the SJB, harness side as follows:

SJB CONNECTOR-PIN SPECIFICATION

Vehicle	Inoperative Reversing Lamp Connector-Pin	SJB Connector-Pin	Circuit
Fusion	LH C488-1	C2280e-21	CBP12 (GN/WH)
Fusion	RH C487-1	C2280e-21	CBP12 (GN/WH)
Milan, Zephyr	LH C451-1	C2280e-21	CBP12 (GN/WH)
Milan, Zephyr	RH C461-1	C2280e-21	CBP12 (GN/WH)

Is the resistance less than 5 ohms?

Yes : GO to U7.

No : REPAIR the circuit. CLEAR the DTC. REPEAT the self-test.

U7 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 MULTIFUNCTION ELECTRONIC CONTROL MODULES . 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.
U8 CHECK FOR CORRECT INSTRUMENT CLUSTER OPERATION
- Disconnect the instrument cluster connector.
- Check for:
  - Corrosion
  - Pushed-out pins
- Connect the instrument cluster connector and make sure it seats 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.