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Home >> Ford >> 2000 >> Contour SE, 2.0 3, Standard >> Repair and Diagnosis >> External Pages >> Different car >> Section 1831 (Exterior Lighting System) >> Diagnostic Tests >> Reversing Lamps >> Pinpoint Tests >> Pinpoint Test T: The Reversing Lamps Are Inoperative >> Pinpoint Test T: The Reversing Lamps Are Inoperative

Pinpoint Test T: The Reversing Lamps Are Inoperative

WARNING: This page is about a different car, the 2007 Lincoln Mark LT and 2007 Ford Pickup. However, it is still accessible from the selected car via links, so may be relevant.
CAUTION: Use the correct probe adapter(s) when making measurements. Failure to use the correct probe adapter(s) may damage the connector.
  1. T1 CHECK FOR VOLTAGE TO THE DIGITAL TR SENSOR OR THE REVERSING LAMP SWITCH 
    • Key in OFF position.
    • Disconnect: Digital TR Sensor C167 or Reversing Lamp Switch C169
    • Key in ON position.
    • For vehicles equipped with an automatic transmission, measure the voltage between the digital TR sensor C167-9, circuit 295 (LB/PK), harness side and ground.
      • Fig 1: Checking Voltage To Digital TR Sensor Or Reversing Lamp Switch (Automatic Transmission)
      GF0004620Courtesy of FORD MOTOR CO.
    • For vehicles equipped with a manual transmission, measure the voltage between the reversing lamp switch C169-2, circuit 295 (LB/PK), harness side and ground.
      • Fig 2: Checking Voltage To Digital TR Sensor Or Reversing Lamp Switch (Manual Transmission)
      GF0004621Courtesy of FORD MOTOR CO.
    • Is the voltage greater than 10 volts? 
    1. YES  : Go to  T3.
    2. NO  : VERIFY the CJB fuse 14 (10A) is OK. If OK, go to  T2 .
  2. T2 CHECK CIRCUIT 295 (LB/PK) FOR AN OPEN 
    • Key in OFF position.
    • Disconnect: CJB C270b
    • Key in ON position.
    • Measure the voltage between the CJB C270b pin 1, circuit 295 (LB/PK), component side and ground.
      • Fig 3: Checking Circuit 295 (LB/PK) For Open
      GF0004622Courtesy of FORD MOTOR CO.
    • Is the voltage greater than 10 volts? 
    1. YES  : REPAIR circuit 295 (LB/PK). TEST the system for normal operation.
    2. NO  : REPAIR or INSTALL a new CJB. TEST the system for normal operation.
  3. T3 CHECK THE REVERSING LAMP OPERATION 
    • Key in OFF position.
    • For vehicles equipped with an automatic transmission, connect a fused (10A) jumper wire between the digital TR sensor C167-11, circuit 1043 (DG/YE), harness side and the digital TR sensor C167-9, circuit 295 (LB/PK), harness side.
      • Fig 4: Checking Reversing Lamp Operation (Automatic Transmission)
      GF0004623Courtesy of FORD MOTOR CO.
    • For vehicles with a manual transmission, connect a fused (10A) jumper wire between the reversing lamp switch C169-1, circuit 1043 (DG/YE), harness side and the reversing lamp switch C169-2, circuit 295 (LB/PK), harness side.
      • Fig 5: Checking Reversing Lamp Operation (Manual Transmission)
      GF0004624Courtesy of FORD MOTOR CO.
    • Key in ON position.
    • Do the reversing lamps illuminate? 
    1. YES  : For vehicles equipped with an automatic transmission, INSTALL a new digital TR sensor. REFER to AUTOMATIC TRANSAXLE/TRANSMISSION - 4R70E/4R75E article. TEST the system for normal operation.

      For vehicles equipped with a manual transmission, INSTALL a new reversing lamp switch. TEST the system for normal operation.

    2. NO  : REMOVE the jumper wire. Go to  T4 .
  4. T4 CHECK CIRCUIT 1043 (DG/YE) OR CIRCUIT 140 (BK/PK) FOR AN OPEN 
    • Key in OFF position.
    • Disconnect: LH Reversing Lamp C451 or RH Reversing Lamp C461
    • For vehicles equipped with an automatic transmission, measure the resistance between digital TR sensor C167-11, circuit 1043 (DG/YE), harness side and LH reversing lamp C451-3 or RH reversing lamp C461-3, circuit 1043 (DG/YE) or circuit 140 (BK/PK) (early build), harness side.
      • Fig 6: Checking Circuit 1043 (DG/YE) Or 140 (BK/PK) For An Open (Automatic Transmission)
      GF0004625Courtesy of FORD MOTOR CO.
    • For vehicles equipped with a manual transmission, measure the resistance between the reversing lamp switch C169-1, circuit 1043 (DG/YE), harness side and the LH reversing lamp C451-3 or the RH reversing lamp C461-3, circuit 1043 (DG/YE) or circuit 140 (BK/PK) (early build), harness side.
      • Fig 7: Checking Circuit 1043 (DG/YE) Or 140 (BK/PK) For An Open (Manual Transmission)
      GF0004626Courtesy of FORD MOTOR CO.
    • Is the resistance less than 5 ohms? 
    1. YES  : REPAIR circuit 57 (BK) for an open. TEST the system for normal operation.
    2. NO  : REPAIR circuit 1043 (DG/YE) or circuit 140 (BK/PK) as necessary. TEST the system for normal operation.
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