Pinpoint Test W: The Reversing Lamps Are Inoperative

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.

W1 USE THE RECORDED DIAGNOSTIC TROUBLE CODES (DTCs) FROM THE SJB SELF-TEST
- Using the recorded results from the SJB self-test:
- Were any DTCs recorded?
Yes: If DTC B2407, GO to W2.

If DTC B2382, GO to W4.

All others, REFER to the SMART JUNCTION BOX (SJB) DIAGNOSTIC TROUBLE CODE (DTC) INDEX for correct diagnostics.

No: If equipped with an automatic transaxle, GO to W5.

If equipped with a manual transaxle, GO to W7.
W2 CHECK CIRCUIT 57 (BK) FOR AN OPEN (REVERSING LAMPS)
- Key in OFF position.
- Disconnect: Inoperative Reversing Lamp.
- Measure the resistance between the LH reversing lamp C451-3, circuit 57 (BK), harness side and ground; or between the RH reversing lamp C461-3, circuit 57 (BK), harness side and ground.
  
  Fig 1: Checking Circuit 57 (BK) For An Open (Reversing Lamps)
  Courtesy of FORD MOTOR CO.
- Is the resistance less than 5 ohms?
Yes: GO to W3.

No: REPAIR the circuit. CLEAR the DTCs. REPEAT the self-test.
W3 CHECK CIRCUIT 140 (BK/PK) FOR AN OPEN
- Disconnect: SJB C2280c.
- Measure the resistance between the LH reversing lamp C451-1, circuit 140 (BK/PK), harness side and the SJB C2280c-10, circuit 140 (BK/PK), harness side; or between the RH reversing lamp C461-1, circuit 140 (BK/PK), harness side and the SJB C2280C-10, circuit 140 (BK/PK), harness side.
  
  Fig 2: Checking Circuit 140 (BK/PK) For An Open
  Courtesy of FORD MOTOR CO.
- Is the resistance less than 5 ohms?
Yes: GO to W11.

No: REPAIR the circuit. CLEAR the DTCs. REPEAT the self-test.
W4 CHECK CIRCUIT 140 (BK/PK) FOR A SHORT TO GROUND
- Disconnect: LH Reversing Lamp C451.
- Disconnect: RH Reversing Lamp C461.
- Disconnect: SJB C2280c.
- Measure the resistance between the LH reversing lamp C451-1, circuit 140 (BK/PK), harness side and ground; or between the RH reversing lamp C461-1, circuit 140 (BK/PK), harness side and ground.
  
  Fig 3: Checking Circuit 140 (BK/PK) For A Short To Ground
  Courtesy of FORD MOTOR CO.
- Is the resistance greater than 10,000 ohms?
Yes: GO to W11

No: REPAIR the circuit. RUN the on-demand self-test (required to clear certain DTCs). CORRECT any unresolved DTCs. CLEAR all DTCs. TEST the system for normal operation.
W5 CHECK THE PCM
- Key in ON position.
- Enter the following diagnostic mode on the scan tool: PCM Gear Selection PID.
- Engage the parking brake.
- Monitor the PCM gear selection PID while placing the selector lever in REVERSE, then NEUTRAL.
- Does the PID match with the gear selected?
Yes: GO to W6.

No: REFER to AUTOMATIC TRANSAXLE/TRANSMISSION - CD4E or AUTOMATIC TRANSAXLE/TRANSMISSION - ELECTRONICALLY CONTROLLED CONTINUOUSLY VARIABLE TRANSMISSION (ECVT) to continue diagnosis of the transaxle.
W6 CHECK THE INSTRUMENT CLUSTER
- Enter the following diagnostic mode on the scan tool: Instrument Cluster Gear Selection PID.
- Monitor the instrument cluster gear selection PID while placing the transaxle in REVERSE, then NEUTRAL.
- Does the PID match with the gear selected?
Yes: GO to W11.

No: GO to W12.
W7 CHECK CIRCUIT 57 (BK) FOR AN OPEN (REVERSING LAMP SWITCH)
- Key in OFF position.
- Disconnect: Reversing Lamp Switch C169.
- Measure the resistance between the reversing lamp switch C169-2, circuit 57 (BK), harness side and ground.
  
  Fig 4: Checking Circuit 57 (BK) For An Open (Reversing Lamp Switch)
  Courtesy of FORD MOTOR CO.
- Is the resistance less than 5 ohms?
Yes: GO to W8.

No: REPAIR the circuit. TEST the system for normal operation.
W8 CHECK CIRCUIT 1789 (VT/WH) FOR VOLTAGE
- Key in ON position.
- Measure the voltage between the reversing lamp switch C169-1, circuit 1789 (VT/WH), harness side and ground.
  
  Fig 5: Checking Circuit 1789 (VT/WH) For Voltage
  Courtesy of FORD MOTOR CO.
- Is the voltage greater than 10 volts?
Yes: GO to W9.

No: GO to W10.
W9 CHECK THE REVERSING LAMP SWITCH
- Key in OFF position.
- Connect a fused (5A) jumper wire between the reversing lamp switch C169-1, circuit 1789 (VT/WH), harness side and the reversing lamp switch C169-2, circuit 57 (BK), harness side.
  
  Fig 6: Checking Reversing Lamp Switch
  Courtesy of FORD MOTOR CO.
- Key in ON position.
- Do the reversing lamps illuminate?
Yes: INSTALL a new reversing lamp switch. REFER to REVERSING LAMP SWITCH . TEST the system for normal operation.

No: REMOVE the jumper wire. GO to W11.
W10 CHECK CIRCUIT 1789 (VT/WH) FOR AN OPEN
- Key in OFF position.
- Disconnect: SJB 02280b.
- Measure the resistance between the reversing lamp switch C169-1, circuit 1789 (VT/WH), harness side and the SJB C2280b-7, circuit 1789 (VT/WH), harness side.
  
  Fig 7: Checking Circuit 1789 (VT/WH) For An Open
  Courtesy of FORD MOTOR CO.
- Is the resistance less than 5 ohms?
Yes: GO to W11.

No: REPAIR the circuit. TEST the system for normal operation.
W11 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.
W12 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.