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Home >> Ford >> 2002 >> Taurus LX, 3.0 S >> Repair and Diagnosis >> External Pages >> Different car >> Section 2479 (Exterior Lighting System) >> Diagnostic Tests >> Reversing Lamps >> Pinpoint Tests >> Pinpoint Test O: The Reversing Lamps Are Inoperative >> Pinpoint Test O: The Reversing Lamps Are Inoperative

Pinpoint Test O: The Reversing Lamps Are Inoperative

WARNING: This page is about a different car, the 2008 Ford RV Cutaway, 2008 Ford Econoline, 2008 Ford E450 Super Duty, and 2008 Ford Cutaway. 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. O1 CHECK CIRCUIT 57 (BK) FOR AN OPEN 
    • Key in OFF position.
    • Disconnect: LH or RH Reversing Lamp
      • Fig 1: Checking Circuit 57 (BK) For An Open - Non-Cutaway Vehicles
      GF0044900Courtesy of FORD MOTOR CO.
    • For non-cutaway vehicles, measure the resistance between the LH reversing lamp C451-1, circuit 57 (BK), harness side and ground; or the RH reversing lamp C461-1, circuit 57 (BK), harness side and ground.
      • Fig 2: Checking Circuit 57 (BK) For An Open - Cutaway Vehicles
      GF0044894Courtesy of FORD MOTOR CO.
    • For cutaway vehicles, measure the resistance between the LH reversing lamp C414-2, circuit 57 (BK), harness side and ground; or between the RH reversing lamp C417-2, circuit 57 (BK), harness side and ground.
    • Is the resistance less than 5 ohms? 
    1. YES  : Go to  O2.
    2. NO  : REPAIR the circuit. TEST the system for normal operation.
  2. O2 DETERMINE THE TRANSMISSION TYPE 
    • Connect the previously disconnected reversing lamp.
    • Check the vehicle transmission type.
    • Is the vehicle equipped with a TorqShift transmission? 
    1. YES  : Go to  O5.
    2. NO  : Go to  O3.
  3. O3 CHECK CIRCUIT 296 (WH/VT) FOR AN OPEN (WITHOUT TORQSHIFT) 
    • Disconnect: Digital TR Sensor C167
    • Key in ON position.
      • Fig 3: Checking Circuit 296 (WH/VT) For An Open (Without Torqshift)
      GF0004620Courtesy of FORD MOTOR CO.
    • Measure the voltage between the digital TR sensor C167-9, circuit 296 (WH/VT), harness side and ground.
    • Is the voltage greater than 10 volts? 
    1. YES  : Go to  O4.
    2. NO  : VERIFY the CJB fuse 12 (15A) is OK. If OK, REPAIR the circuit. TEST the system for normal operation.
  4. O4 CHECK THE DIGITAL TR SENSOR 
    • Key in OFF position.
      • Fig 4: Connecting Fused Jumper Wire
      GF0004623Courtesy of FORD MOTOR CO.
    • Connect a fused (5A) jumper wire between the digital TR sensor C167-9, circuit 296 (WH/VT), 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  : REMOVE the jumper wire. INSTALL a new digital TR sensor. REFER to AUTOMATIC TRANSAXLE/TRANSMISSION - 4R70E/4R75E article. TEST the system for normal operation.
    2. NO  : REMOVE the jumper wire. REPAIR circuit 140 (BK/PK) for an open. TEST the system for normal operation.
  5. O5 CHECK THE REVERSING LAMP RELAY 
    • Disconnect: Reversing Lamp Relay
    • Substitute a known good relay for the reversing lamp relay.
    • Apply the parking brake.
    • Key in ON position.
    • Select REVERSE.
    • Do the reversing lamps illuminate? 
    1. YES  : REMOVE the known good relay. INSTALL a new reversing lamp relay. TEST the system for normal operation.
    2. NO  : REMOVE the known good relay. Go to  O6.
  6. O6 CHECK CIRCUIT 296 (WH/VT) FOR AN OPEN (WITH TORQSHIFT) 
    • Select PARK.
      • Fig 5: Checking Circuit 296 (WH/VT) For An Open (With Torqshift)
      GF0012881Courtesy of FORD MOTOR CO.
    • Measure the voltage between the reversing lamp relay pin 3, circuit 296 (WH/VT), relay box face side and ground.
    • Is the voltage greater than 10 volts? 
    1. YES  : Go to  O7.
    2. NO  : VERIFY the CJB fuse 12 (15A) is OK. If OK, REPAIR the circuit. TEST the system for normal operation.
  7. O7 CHECK CIRCUIT 140 (BK/PK) FOR AN OPEN 
      Fig 6: Checking Circuit 140 (BK/PK) For An Open
      GF0012882Courtesy of FORD MOTOR CO.
    • Install a fused (5A) jumper wire between the reversing lamp relay pin 5, circuit 140 (BK/PK), relay box face side and the reversing lamp relay pin 3 circuit 296 (WH/VT), relay box face side.
    • Do the reversing lamps illuminate? 
    1. YES  : REMOVE the jumper wire. Go to  O8.
    2. NO  : REMOVE the jumper wire. REPAIR the circuit. TEST the system for normal operation.
  8. O8 CHECK CIRCUIT 361 (RD) FOR AN OPEN 
      Fig 7: Checking Circuit 361 (RD) For An Open
      GF0012883Courtesy of FORD MOTOR CO.
    • Measure the voltage between the reversing lamp relay pin 1, circuit 361 (RD), relay box face side and ground.
    • Is the voltage greater than 10 volts? 
    1. YES  : Go to  O9.
    2. NO  : REPAIR the circuit. TEST the system for normal operation.
  9. O9 CHECK CIRCUIT 1362 (DG/OG) FOR AN OPEN 
    • Key in OFF position.
    • Disconnect: PCM C175b (Gasoline Engine) or C1381t (Diesel Engine)
    • Key in ON position.
      • Fig 8: Checking Circuit 1362 (DG/OG) For An Open - Gasoline Engines
      GF0012884Courtesy of FORD MOTOR CO.
    • For gasoline engines, measure the resistance between the PCM C175b-24, circuit 1362 (DG/OG), harness side and the reversing lamp relay pin 2, circuit 1362 (DG/OG), relay box face side.
      • Fig 9: Checking Circuit 1362 (DG/OG) For An Open - Diesel Engines
      GF0012885Courtesy of FORD MOTOR CO.
    • For diesel engines, measure the resistance between the PCM C1381t-3, circuit 1362 (DG/OG), harness side and the reversing lamp relay pin 2, circuit 1362 (DG/OG), relay box face side.
    • Is the resistance less than 5 ohms? 
    1. YES  : Go to  O10.
    2. NO  : REPAIR the circuit. TEST the system for normal operation.
  10. O10 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? 
    1. YES  : INSTALL a new PCM. REFER to ELECTRONIC ENGINE CONTROLS - GASOLINE ENGINES article or ELECTRONIC ENGINE CONTROLS - DIESEL ENGINE article. TEST the system for normal operation.
    2. 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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