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Home >> Mercury >> 2008 >> Milan Base, 3.0 1, FWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 175 (Exterior Lighting System) >> Diagnosis And Testing >> Stoplamps >> Pinpoint Tests >> Pinpoint Test J: One Or More Stoplamps Are Inoperative >> Testing

Pinpoint Test J: One Or More Stoplamps Are Inoperative: Testing

WARNING: This page is about a different car, the 2005 Mercury Montego, 2005 Ford Freestyle, and 2005 Ford Five Hundred. However, it is still accessible from the selected car via links, so may be relevant.
  1. J1 CHECK SMART JUNCTION BOX (SJB) DTCs 
    • Key in ON position.
    • Check the recorded results from the SJB self-test.
    • Were any DTCs recorded? 
    • Yes  : For DTC B2044 or B2046, GO to J2.

      For DTC B2045 or B2047, GO to  J4.

    • No  : For Freestyle or Five Hundred, GO to  J7.

      For Montego inoperative high mounted stoplamp, GO to  J7.

      For Montego inoperative rear stoplamp, GO to  J10.

  2. J2 CHECK CIRCUIT 1363 (WH/RD) OR CIRCUIT 1365 (GY/LB) FOR A SHORT TO GROUND 
    • Key in OFF position.
    • Disconnect: SJB C2280e.
    • Disconnect: Inoperative Rear Lamp.
    • Measure the resistance between the LH rear lamp assembly C414-2, circuit 1363 (WH/RD), harness side and ground; or between the RH rear lamp assembly C417-2, circuit 1365 (GY/LB), harness side and ground.
      Fig 1: Checking Circuit 1363 (WH/RD) Or Circuit 1365 (GY/LB) For Short To Ground
      G03992787Courtesy of FORD MOTOR CO.
    • Is the resistance greater than 10,000 ohms? 
    • Yes  : GO to J3.
    • No  : REPAIR the circuit in question. CLEAR the DTCs. REPEAT the self-test.
  3. J3 CHECK THE REAR LAMP JUMPER HARNESS FOR A SHORT 
    • Check the rear lamp jumper harness for exposed wires and a short.
    • Is the rear lamp jumper harness OK? 
    • Yes  : GO to  J13.
    • No  : REPAIR or INSTALL a new rear lamp jumper harness. CLEAR the DTCs. REPEAT the self-test.
  4. J4 CHECK CIRCUIT 1205 (BK) FOR AN OPEN 
    • Key in OFF position.
    • Disconnect: Inoperative Rear Lamp.
    • Measure the resistance between the LH rear lamp assembly C414-6, circuit 1205 (BK), harness side and ground; or between the RH rear lamp assembly C417-6, circuit 1205 (BK), harness side and ground.
      Fig 2: Checking Circuit 1205 (BK) For Open
      G03992788Courtesy of FORD MOTOR CO.
    • Is the resistance less than 5 ohms? 
    • Yes  : GO to J5.
    • No  : REPAIR the circuit. CLEAR the DTCs. REPEAT the self-test.
  5. J5 CHECK CIRCUIT 1363 (WH/RD) OR CIRCUIT 1365 (GY/LB) FOR VOLTAGE 
    • While applying the brake pedal, measure the voltage between the LH rear lamp assembly C414-2, circuit 1363 (WH/RD), harness side and ground; or between the RH rear lamp assembly C417-2, circuit 1365 (GY/LB), harness side and ground.
      Fig 3: Checking Circuit 1363 (WH/RD) Or Circuit 1365 (GY/LB) For Voltage
      G03992789Courtesy of FORD MOTOR CO.
    • Is the voltage greater than 10 volts? 
    • Yes  : REPAIR or INSTALL a new rear lamp jumper harness. CLEAR the DTCs. REPEAT the self-test.
    • No  : GO to J6.
  6. J6 CHECK CIRCUIT 1363 (WH/RD) OR CIRCUIT 1365 (GY/LB) FOR AN OPEN 
    • Disconnect: SJB C2280e.
    • Measure the resistance between the LH rear lamp assembly C414-2, circuit 1363 (WH/RD), harness side and the SJB C2280e-5, circuit 1363 (WH/RD), harness side; or between the RH rear lamp assembly C417-2, circuit 1365 (GY/LB), harness side and the SJB C2280e-10, circuit 1365 (GY/LB), harness side.
      Fig 4: Checking Circuit 1363 (WH/RD) Or Circuit 1365 (GY/LB) For Open
      G03992790Courtesy of FORD MOTOR CO.
    • Is the resistance less than 5 ohms? 
    • Yes  : GO to  J13.
    • No  : REPAIR the circuit in question. CLEAR the DTCs. REPEAT the self-test.
  7. J7 CHECK CIRCUIT 1374 (TN/LB) FOR VOLTAGE 
    • Key in OFF position.
    • Disconnect: High Mounted Stoplamp.
    • While applying the brake pedal, measure the voltage between the high mounted stoplamp, harness side and ground as follows:
      CONNECTOR-PIN REFERENCE

      Vehicle Connector-Pin Circuit
      Freestyle C904-1 1374 (LG)
      Five Hundred C904-1 1374 (TN/LB)
      Montego C9030-1 1374 (TN/LB)
    • Is the voltage greater than 10 volts? 
    • Yes  : GO to J8.
    • No  : For Freestyle or Five Hundred, GO to  J9.

      For Montego, REPAIR circuit 1374 (TN/LB). TEST the system for normal operation.

  8. J8 CHECK CIRCUIT 1205 (BK) FOR AN OPEN 
    • Measure the resistance between the high mounted stoplamp, harness side and ground as follows:
      CONNECTOR-PIN REFERENCE

      Vehicle Connector-Pin Circuit
      Freestyle C904-2 1205 (BK)
      Five Hundred C904-2 1205 (BK)
      Montego C9030-3 1205 (BK)
    • Is the resistance less than 5 ohms? 
  9. J9 CHECK CIRCUIT 1374 (TN/LB) FOR AN OPEN OR SHORT TO GROUND 
    • Disconnect: SJB C2280e.
    • Measure the resistance between the SJB C2280e-9, circuit 1374 (TN/LB), harness side and the high mounted stoplamp C904-1, circuit 1374 (TN/LB) (GN for Freestyle), harness side; and between the SJB C2280e-9, circuit 1374 (TN/LB), harness side and ground.
      Fig 5: Checking Circuit 1374 (TN/LB) For Open Or Short To Ground
      G03992791Courtesy of FORD MOTOR CO.
    • Is the resistance less than 5 ohms between the SJB and the high mounted stoplamp, and greater than 10,000 ohms between the SJB and ground? 
    • Yes  : GO to  J13.
    • No  : REPAIR the circuit. TEST the system for normal operation.
  10. J10 CHECK CIRCUIT 1205 (BK) FOR AN OPEN (MONTEGO) 
    • Key in OFF position.
    • Disconnect: Inoperative Rear Lamp.
    • Measure the resistance between the LH rear lamp assembly C414-6, circuit 1205 (BK), harness side and ground; or between the RH rear lamp assembly C417-6, circuit 1205 (BK), harness side and ground.
      Fig 6: Checking Circuit 1205 (BK) For Open (Montego)
      G03992788Courtesy of FORD MOTOR CO.
    • Is the resistance less than 5 ohms? 
    • Yes  : GO to J11.
    • No  : REPAIR the circuit. TEST the system for normal operation.
  11. J11 CHECK CIRCUIT 1374 (TN/LB) FOR AN OPEN (MONTEGO) 
    • While applying the brake pedal, measure the voltage between the LH rear lamp assembly C414-3, circuit 1374 (TN/LB), harness side and ground; or between the RH rear lamp assembly C417-3, circuit 1374 (TN/LB), harness side and ground.
      Fig 7: Checking Circuit 1374 (TN/LB) For Open (Montego)
      G03992793Courtesy of FORD MOTOR CO.
    • Is the voltage greater than 10 volts? 
    • Yes  : GO to J12.
    • No  : REPAIR the circuit. TEST the system for normal operation.
  12. J12 CHECK THE REAR LAMP JUMPER HARNESS FOR AN OPEN (MONTEGO) 
    • Check the rear lamp jumper harness for an open.
    • Is the rear lamp jumper harness OK? 
    • Yes  : INSTALL a new rear lamp assembly. REFER to REAR LAMP ASSEMBLY - FIVE HUNDRED, MONTEGO . TEST the system for normal operation.
    • No  : REPAIR or INSTALL a new rear lamp jumper harness. TEST the system for normal operation.
  13. J13 CHECK FOR CORRECT SJB OPERATION 
    • Disconnect all the SJB connectors.
    • Check for:
      • corrosion
      • pushed-out pins
    • Connect all the SJB 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 SJB. REFER to MULTIFUNCTION ELECTRONIC MODULES . 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. CLEAR the DTCs. REPEAT the self-test.
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