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Home >> Ford >> 2002 >> Taurus LX, 3.0 S >> Repair and Diagnosis >> External Pages >> Different car >> Section 2800 (Exterior Lighting System) >> Diagnostic Tests >> Reversing Lamps >> Pinpoint Tests >> Pinpoint Test R: The Reversing Lamps Are Inoperative >> Pinpoint Test R: The Reversing Lamps Are Inoperative

Pinpoint Test R: The Reversing Lamps Are Inoperative

WARNING: This page is about a different car, the 2010 Lincoln Town Car. 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. R1 CHECK THE DIGITAL TR SENSOR ADJUSTMENT 
    • Key in OFF position.
    • Check the digital TR sensor adjustment. Refer to GENERAL PROCEDURES article.
    • Is the digital TR sensor adjusted correctly? 
    1. YES  : Go to  R2.
    2. NO  : ADJUST the digital TR sensor. REFER to GENERAL PROCEDURES article. TEST the system for normal operation.
  2. R2 CHECK CIRCUIT 1789 (VT/WH) FOR AN OPEN 
    • Disconnect: Digital TR Sensor C167
    • Key in ON position.
      • Fig 1: Checking Circuit For Open
      GF0004620Courtesy of FORD MOTOR CO.
    • Measure the voltage between the digital TR sensor C167-9, circuit 1789 (VT/WH), harness side and ground.
    • Is the voltage greater than 10 volts? 
    1. YES  : Go to  R3.
    2. NO  : VERIFY the CJB fuse 4 (10A) is OK. If OK, REPAIR the circuit. TEST the system for normal operation.
  3. R3 CHECK THE DIGITAL TR SENSOR 
    • Key in OFF position.
      • Fig 2: Connecting Fused Jumper Wire
      GF0004623Courtesy of FORD MOTOR CO.
    • Connect a fused (10A) jumper wire between the digital TR sensor C167-9, circuit 1789 (VT/WH), harness side and the digital TR sensor C167-11, circuit 140 (BK/PK), harness side.
    • Key in ON position.
    • Do the reversing lamps illuminate? 
    1. YES  : INSTALL a new digital TR sensor. REFER to IN-VEHICLE SERVICING article. TEST the system for normal operation.
    2. NO  : Go to  R4.
  4. R4 CHECK CIRCUIT 57 (BK) FOR AN OPEN 
    • Key in OFF position.
    • Disconnect: Inoperative Reversing Lamp
      • Fig 3: Checking Circuit For Open
      GF0019091Courtesy of FORD MOTOR CO.
    • Measure the resistance between the LH reversing lamp C487-1, circuit 57 (BK), harness side and ground; or between the RH reversing lamp C488-1, circuit 57 (BK), harness side and ground.
    • Is the resistance less than 5 ohms? 
    1. YES  : REPAIR circuit 140 (BK/PK) for an open. TEST the system for normal operation.
    2. NO  : REPAIR circuit 57 (BK) for an open. TEST the system for normal operation.
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