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Home >> Ford >> 2002 >> Taurus LX, 3.0 U >> Repair and Diagnosis >> External Pages >> Different car >> Section 2592 (Exterior Lighting System) >> Diagnosis And Testing >> Reversing Lamps >> Pinpoint Tests >> Pinpoint Test W: Both Reversing Lamps Are Inoperative >> Pinpoint Test W: Both Reversing Lamps Are Inoperative

Pinpoint Test W: Both Reversing Lamps Are Inoperative

WARNING: This page is about a different car, the 2010 Mercury Milan, 2010 Lincoln MKZ, and 2010 Ford Fusion. However, it is still accessible from the selected car via links, so may be relevant.
NOTE: Use the correct probe adapter(s) when making measurements. Failure to use the correct probe adapter(s) may damage the connector.
  1. W1 CHECK THE REVERSING LAMPS RELAY 
    • Ignition OFF.
    • Disconnect: Reversing Lamps Relay.
    • Ignition ON.
    • Substitute a known good relay and recheck the reversing lamps operation.
    • Do the reversing lamps operate correctly? 
    • Yes:  REMOVE the known good relay. INSTALL a new reversing lamps relay. TEST the system for normal operation.
    • No:  REMOVE the known good relay. GO to  W2.
  2. W2 CHECK FOR VOLTAGE TO THE REVERSING LAMPS RELAY COIL 
    • Ignition ON.
    • Measure the voltage between the reversing lamps relay pin 1, circuit CBK03 (GY), BJB face side and ground.
      Fig 1: Measuring Voltage Between Reversing Lamps Relay Pin 1 & Ground
      G06257387Courtesy of FORD MOTOR CO.
    • Is the voltage greater than 10 volts? 
    • Yes:  GO to  W3.
    • No:  VERIFY the BJB fuse 47 (10A) is OK. If OK, REPAIR circuit CBK03 (GY) for an open. TEST the system for normal operation. If not OK, REFER to the appropriate SYSTEM WIRING DIAGRAMS article to identify the possible causes of the circuit short.
  3. W3 CHECK FOR VOLTAGE TO THE REVERSING LAMPS RELAY SWITCH 
    • Measure the voltage between the reversing lamps relay pin 3, circuit CBK03 (GY), BJB face side and ground.
      Fig 2: Measuring Voltage Between Reversing Lamps Relay Pin 3 & Ground
      G06271112Courtesy of FORD MOTOR CO.
    • Is the voltage greater than 10 volts? 
    • Yes:  GO to  W4.
    • No:  REPAIR circuit CBK03 (GY) for an open. TEST the system for normal operation.
  4. W4 BYPASS THE REVERSING LAMPS RELAY 
    • Connect a fused jumper wire between the reversing lamps relay pin 3, circuit CBK03 (GY), BJB face side and the reversing lamps relay pin 5, circuit CLS10 (GN/BN), BJB face side.
      Fig 3: Connecting Fused Jumper Wire Between Reversing Lamps Relay Pin 3 & Pin 5
      G06257389Courtesy of FORD MOTOR CO.
    • Do the reversing lamps illuminate? 
    • Yes:  REMOVE the jumper wire.

      For vehicles with a manual transaxle, GO to  W5.

      For vehicles with an automatic transaxle, GO to  W7.

    • No:  REMOVE the jumper wire. REPAIR circuit CLS10 (GN/BN) for an open. TEST the system for normal operation.
  5. W5 CHECK FOR VOLTAGE TO THE REVERSING LAMP SWITCH 
    • Ignition OFF.
    • Connect: Reversing Lamps Relay.
    • Disconnect: Reversing Lamp Switch C169.
    • Ignition ON.
    • Measure the voltage between the reversing lamp switch C169-1, circuit CLS28 (BU/WH), harness side and ground.
      Fig 4: Measuring Voltage Between Reversing Lamp Switch C169-1 & Ground
      G06257390Courtesy of FORD MOTOR CO.
    • Is the voltage greater than 10 volts? 
    • Yes:  GO to  W6.
    • No:  REPAIR circuit CLS28 (BU/WH) for an open. TEST the system for normal operation.
  6. W6 CHECK FOR VOLTAGE TO THE REVERSING LAMP SWITCH USING THE CONNECTOR GROUND 
    • Measure the voltage between the reversing lamp switch C169-1, circuit CLS28 (BU/WH), harness side and the reversing lamp switch C169-2, circuit GD121 (BK/YE), harness side.
      Fig 5: Measuring Voltage Between Reversing Lamp Switch C169-1 & C169-2
      G06257391Courtesy of FORD MOTOR CO.
    • Is the voltage greater than 10 volts? 
    • Yes:  INSTALL a new reversing lamp switch. REFER to Removal and Installation . TEST the system for normal operation.
    • No:  REPAIR circuit GD121 (BK/YE) for an open. TEST the system for normal operation.
  7. W7 CHECK FOR PCM OR TCM TR SENSOR DTCs FROM THE SELF-TEST 
    • Review the DTCs from the PCM (2.5L or 3.0L engine) or the TCM (3.5L engine) Key ON Engine OFF (KOEO) self-test.
    • Are any TR sensor DTCs present? 
  8. W8 CHECK THE REVERSING LAMPS RELAY COIL GROUND CONTROLLED CIRCUIT FOR A SHORT TO VOLTAGE 
    • Ignition OFF.
    • Disconnect: PCM C175t (2.5L or 3.0L Engine).
    • Disconnect: TCM C1533 (3.5L Engine).
    • Ignition ON.
    • For Hybrid vehicles, measure the voltage between the PCM C175t-34, circuit CLS28 (BU/WH), harness side and ground.
      Fig 6: Measuring Voltage Between PCM C175T-34 & Ground
      G06099219Courtesy of FORD MOTOR CO.
    • For non-Hybrid vehicles with a 2.5L or 3.0L engine, measure the voltage between the PCM C175t-33, circuit CLS28 (BU/WH), harness side and ground.
      Fig 7: Measuring Voltage Between PCM C175T-33 & Ground
      G06258228Courtesy of FORD MOTOR CO.
    • For vehicles with a 3.5L engine, measure the voltage between the TCM C1533-13, circuit CLS28 (BU/WH), harness side and ground.
      Fig 8: Measuring Voltage Between TCM C1533-13 & Ground
      G06257394Courtesy of FORD MOTOR CO.
    • Is any voltage present? 
    • Yes:  REPAIR circuit CLS28 (BU/WH) for a short to voltage. CLEAR the DTCs. REPEAT the self-test.
    • No:  GO to  W9.
  9. W9 CHECK FOR VOLTAGE TO THE PCM OR THE TCM WITH THE REVERSING LAMP RELAY CONNECTED 
    • Ignition OFF.
    • Connect: Reversing Lamps Relay.
    • Ignition ON.
    • For Hybrid vehicles, measure the voltage between the PCM C175T-34, circuit CLS28 (BU/WH), harness side and ground.
      Fig 9: Measuring Voltage Between PCM C175T-34 & Ground
      G06099219Courtesy of FORD MOTOR CO.
    • For non-Hybrid vehicles with a 2.5L or 3.0L engine, measure the voltage between the PCM C175T-33, circuit CLS28 (BU/WH), harness side and ground.
      Fig 10: Measuring Voltage Between PCM C175T-33 & Ground
      G06258228Courtesy of FORD MOTOR CO.
    • For vehicles with a 3.5L engine, measure the voltage between the TCM C1533-13, circuit CLS28 (BU/WH), harness side and ground.
      Fig 11: Measuring Voltage Between TCM C1533-13 & Ground
      G06257394Courtesy of FORD MOTOR CO.
    • Is the voltage greater than 10 volts? 
    • Yes:  For vehicles with a 3.5L engine, GO to  W10.

      For all other vehicles, GO to  W11.

    • No  : REPAIR circuit CLS28 (BU/WH) for an open. CLEAR the DTCs. REPEAT the self-test.
  10. W10 CHECK FOR CORRECT TCM OPERATION 
    • Disconnect the TCM connector.
    • Check for:
      • corrosion
      • damaged pins
      • pushed-out pins
    • Connect the TCM 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 TCM. REFER to INSTALLATION . 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.
  11. W11 CHECK FOR CORRECT PCM OPERATION 
    • Disconnect all the PCM connectors.
    • Check for:
      • corrosion
      • damaged pins
      • 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 INSTALLATION , INSTALLATION , INSTALLATION or INSTALLATION . 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.
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