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Home >> Mercury >> 2008 >> Milan Base, 3.0 1, FWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 114 (Interior Lighting System -- F250-F550 Super Duty) >> Diagnosis And Testing >> Interior Lighting >> Pinpoint Tests >> Pinpoint Test A: The Interior Lamps Are Inoperative

Pinpoint Test A: The Interior Lamps Are Inoperative

WARNING: This page is about a different car, the 2005 Ford Pickup, 2005 Ford F550 Super Duty, 2005 Ford F450 Super Duty, and 2005 Ford Cab & Chassis. However, it is still accessible from the selected car via links, so may be relevant.
  1. A1 CHECK THE OPERATION OF THE DEMAND LIGHTING 
    • Operate the demand lighting function on one interior lamp.
    • Does the demand lighting operate correctly? 
    • Yes  : GO to A2.
    • No  : GO to  A5.
  2. A2 CHECK THE OPERATION OF THE HEADLAMP SWITCH 
    • With the headlamp switch, attempt to operate the interior lamps.
    • Do any interior lamps illuminate? 
    • Yes  : GO to SYMPTOM CHART  for correct diagnosis.
    • No  : GO to A3.
  3. A3 CHECK CIRCUIT 785 (BK/LG) FOR AN OPEN 
    • Key in OFF position.
    • Disconnect: Instrument Cluster C220b.
    • Measure the voltage between the instrument cluster C220b-13, circuit 785 (BK/LG) and ground.
      Fig 1: Measuring Voltage Between Instrument Cluster C220B-13 Circuit 785 (BK/LG) And Ground
      G03925086Courtesy of FORD MOTOR CO.
    • Is the voltage greater than 10 volts? 
    • Yes  : GO to A4.
    • No  : VERIFY the central junction box (CJB) fuse 35 (10A) is OK. If OK, REPAIR the circuit. TEST the system for normal operation.
  4. A4 CHECK CIRCUIT 53 (BK/LB) FOR AN OPEN 
    • Measure the resistance between C220b-26, circuit 53 (BK/LB) and ground.
      Fig 2: Measuring Resistance Between C220B-26 Circuit 53 (BK/LB) And Ground
      G03925087Courtesy of FORD MOTOR CO.
    • Is the resistance less than 5 ohms? 
    • Yes  : GO to  A6.
    • No  : GO to A5.
  5. A5 CHECK CIRCUIT 57 (BK) FOR AN OPEN 
    • Disconnect: Interior Lamp C932.
    • Measure the resistance between C932-2, circuit 57 (BK) and ground.
      Fig 3: Measuring Resistance Between C932-2 Circuit 57 (BK) And Ground
      G03925088Courtesy of FORD MOTOR CO.
    • Is the resistance less than 5 ohms? 
    • Yes  : REPAIR circuit 53 (BK/LB) for an open. TEST the system for normal operation.
    • No  : REPAIR circuit 57 (BK) for an open. TEST the system for normal operation.
  6. A6 CHECK CIRCUIT 705 (LG/OG) FOR AN OPEN 
    • Disconnect: Instrument Cluster C220a.
    • Measure the voltage between the instrument cluster C220a-26, circuit 705 (LG/OG) and ground.
      Fig 4: Measuring Voltage Between Instrument Cluster C220A-26 Circuit 705 (LG/OG) And Ground
      G03925089Courtesy of FORD MOTOR CO.
    • Is the voltage greater than 10 volts? 
    • Yes  : GO to A7.
    • No  : VERIFY the CJB fuse 41 (10A) is OK. If OK, REPAIR the circuit. TEST the system for normal operation.
  7. A7 CHECK FOR CORRECT INSTRUMENT CLUSTER OPERATION 
    • Disconnect all instrument cluster connectors.
    • Check for:
      • corrosion
      • pushed-out pins
    • Connect all instrument cluster 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 instrument cluster. REFER to INSTRUMENT CLUSTER . 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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