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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 >> Parking, Rear and License Lamps >> Pinpoint Tests >> Pinpoint Test R: One Or More Parking, Rear, Or License Plate Lamp Is Inoperative >> Testing

Pinpoint Test R: One Or More Parking, Rear, Or License Plate Lamp Is 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. R1 DETERMINE IF ALL THE PARKING LAMPS ARE INOPERATIVE 
    • Key in OFF position.
    • Place the headlamp switch in the PARKING LAMPS ON position.
    • Are all the parking and license plate lamps inoperative? 
    • Yes  VERIFY the SJB fuse 8 (15A) is OK. If OK, GO to  R7.
    • No  : If all the front parking lamps are inoperative, GO to R2. If all the rear parking lamps are inoperative, GO to  R3. If an individual parking lamp is inoperative, GO to  R4.
  2. R2 CHECK CIRCUIT 1057 (OG/BK) FOR AN OPEN 
    • Place the headlamp switch in the OFF position.
    • Disconnect: SJB C2280a.
    • Connect a fused (10A) jumper wire between the SJB C2280a-4, circuit 1846 (GY/LB), harness side and the SJB C2280a-12, circuit 1057 (OG/BK), harness side.
      Fig 1: Connecting Fused (10A) Jumper Wire Between SJB C2280A-4, Circuit 1846 (GY/LB), Harness Side And SJB C2280A-12, Circuit 1057 (OG/BK)
      G03992825Courtesy of FORD MOTOR CO.
    • Do the front parking lamps illuminate? 
    • Yes  : REMOVE the jumper wire. GO to  R7.
    • No  : REPAIR the circuit. TEST the system for normal operation.
  3. R3 CHECK CIRCUIT 1058 (BN/WH) FOR AN OPEN (ALL REAR LAMPS) 
    • Place the headlamp switch in the OFF position.
    • Disconnect: SJB C2280e.
    • Connect a fused (10A) jumper wire between the SJB C2280e-22, circuit 1058 (BN/WH), harness side and the positive battery terminal.
      Fig 2: Connecting Fused (10A) Jumper Wire Between SJB C2280E-22, Circuit 1058 (BN/WH), Harness Side And Positive Battery Terminal
      G03992826Courtesy of FORD MOTOR CO.
    • Do the front parking lamps illuminate? 
    • Yes  : REMOVE the jumper wire. GO to  R7.
    • No  : REPAIR the circuit. TEST the system for normal operation.
  4. R4 CHECK CIRCUIT 1205 (BK) FOR AN OPEN 
    • Place the headlamp switch in the OFF position.
    • Disconnect: Inoperative Lamp.
    • Measure the resistance between the inoperative lamp, harness side and ground as follows:
      INOPERATIVE LAMP CONNECTOR-PIN REFERENCE

      Inoperative Lamp Connector-Pin Circuit
      LH front C1023-1 1205 (BK)
      RH front C1043-1 1205 (BK)
      LH front side marker C1127-1 1205 (BK)
      RH front side marker C1126-1 1205 (BK)
      LH rear lamp assembly C414-6 1205 (BK)
      RH rear lamp assembly C417-6 1205 (BK)
      LH license plate (Five Hundred or Montego) C452-1 1205 (BK)
      RH license plate (Five Hundred or Montego) C462-1 1205 (BK)
      License plate (Freestyle) C490-2 1205 (BK)
    • Is the resistance less than 5 ohms? 
    • Yes  : For a front lamp, REPAIR circuit 1057 (OG/BK). TEST the system for normal operation.

      For a license plate lamp, REPAIR circuit 1058 (BN/WH). TEST the system for normal operation.

      For a rear lamp, GO to R5.

    • No  : REPAIR the circuit. TEST the system for normal operation.
  5. R5 CHECK CIRCUIT 1058 (BN/WH) FOR AN OPEN (INDIVIDUAL REAR LAMP) 
    • Place the headlamp switch in the PARKING LAMPS ON position.
    • Measure the voltage between the LH rear lamp assembly C414-4, circuit 1058 (BN/WH), harness side and ground; or between the RH rear lamp assembly C417-4, circuit 1058 (BN/WH), harness side and ground.
      Fig 3: Checking Circuit 1058 (BN/WH) For An Open (Individual Rear Lamp)
      G03992827Courtesy of FORD MOTOR CO.
    • Is the voltage greater than 10 volts? 
    • Yes  : For Five Hundred or Freestyle, REPAIR or INSTALL a new rear lamp jumper harness. TEST the system for normal operation.

      For Montego, GO to R6.

    • No  : REPAIR the circuit. TEST the system for normal operation.
  6. R6 CHECK THE JUMPER HARNESS 
    • Place the headlamp switch in the OFF position.
    • Inspect the rear lamp jumper harness for opens.
    • 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.
  7. R7 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.
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