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Pinpoint Test Z: The Individual Reversing Lamp Is Inoperative

WARNING: This page is about a different car, the 2004 Lincoln LS. However, it is still accessible from the selected car via links, so may be relevant.
  1. Z1 CHECK THE CIRCUIT 29S-LG9 (OG/GN) FOR AN OPEN 
    • Key in OFF position.
    • Disconnect: Inoperative Reversing Lamp.
    • Key in ON position.
    • Measure the voltage between the LH reversing lamp C451 -2, circuit 29S-LG9 (OG/BK), harness side and ground; or between the RH reversing lamp C461 -2, circuit 29S-LG16 (OG/GN), harness side and ground.
      Fig 1: Measuring Voltage Between LH Reversing Lamp C451 -2, Circuit 29S-LG9 (OG/BK), Harness Side And Ground
      G03202816Courtesy of FORD MOTOR CO.
    • Is the voltage greater than 10 volts? 
    1. Yes  : GO to Z2.
    2. No  : REPAIR the circuit in question. TEST the system for normal operation.
  2. Z2 CHECK THE CIRCUIT 31S-LG9 (BK/GN) OR 31S-LG16 (BK/RD) FOR SHORT TO POWER 
    • Key in OFF position.
    • Disconnect: REM C420e.
    • Key in ON position.
    • Measure the voltage between the LH reversing lamp C451 -1, circuit 31S-LG9 (BK/GN), harness side and ground; or between the RH reversing lamp C461 -1, circuit 31S-LG16 (BK/RD), harness side and ground.
      Fig 2: Measuring voltage between LH Reversing Lamp C451 -1, Circuit 31S-LG9 (BK/GN), Harness Side And Ground
      G03202817Courtesy of FORD MOTOR CO.
    • Is any voltage present? 
    1. Yes  : REPAIR the circuit in question. TEST the system for normal operation.
    2. No  : GO to Z3.
  3. Z3 CHECK THE CIRCUIT 31S-LG9 (BK/GN) OR 31S-LG16 (BK/RD) FOR AN OPEN 
    • Key in OFF position.
    • Measure the resistance between the LH reversing lamp C451-1, circuit 31S-LG9 (BK/GN), harness side and the REM C420e-9, circuit 31S-LG9 (BK/GN), harness side; or between the RH reversing lamp C461 -1, circuit 31S-LG16 (BK/RD), harness side and the REM C420e-10, circuit 31S-LG16 (BK/RD), harness side.
      Fig 3: Measuring Resistance Between LH Reversing Lamp C451-1, Circuit 31S-LG9 (BK/GN)
      G03202818Courtesy of FORD MOTOR CO.
    • Is the resistance less than 5 ohms? 
    1. Yes  : GO to Z4.
    2. No  : REPAIR the circuit in question. TEST the system for normal operation.
  4. Z4 CHECK FOR REM OPERATION 
    • Key in OFF position.
    • Disconnect all REM connectors.
    • Check for:
      • Corrosion
      • Pushed-out pins
    • Connect all REM connectors and make sure they seat correctly.
    • Operate the system and verify the concern is still present.
    • Is the concern still present? 
    1. Yes  : INSTALL a new REM. Refer to MODULE COMMUNICATIONS NETWORK . TEST the system for normal operation
    2. No  : The system is operating correctly at this time. Concern may have been caused by a loose or corroded connector. REPEAT the self-test.
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