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Home >> Ford >> 2000 >> Contour SE, 2.5 L, Standard >> Repair and Diagnosis >> External Pages >> Different car >> Section 939 (Instrument Cluster And Panel Illumination -- F250-F550 Super Duty) >> Diagnosis And Testing >> Instrument Cluster and Panel Illumination >> Pinpoint Tests >> Pinpoint Test A: The Control Illumination Is Inoperative

Pinpoint Test A: The Control Illumination Is 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 PARKING LAMPS 
    • Place the headlamp switch in the ON position.
    • Are the exterior lamps on? 
    • Yes  : GO to A2.
    • No  : VERIFY that central junction box (CJB) fuse 17 (15A) is OK. REFER to EXTERIOR LIGHTING .
  2. A2 CHECK CIRCUIT 14 (BN) FOR VOLTAGE 
    • Place the headlamp switch in the OFF position.
    • Disconnect: Headlamp Switch C205b.
    • Place the headlamp switch in the ON position.
    • Measure the voltage between the headlamp switch C205b pin 6, circuit 14 (BN), harness side and ground.
      Fig 1: Checking Circuit 14 (BN) For Voltage
      G03910663Courtesy of FORD MOTOR CO.
    • Is the voltage greater than 10 volts? 
    • Yes  : GO to  A4.
    • No  : GO to A3.
  3. A3 CHECK CIRCUIT 14 (BN) FOR AN OPEN OR A SHORT TO GROUND 
    • Place the headlamp switch in the OFF position.
    • Disconnect: Headlamp Switch C205a.
    • Measure the resistance between the headlamp switch C205a pin 12, circuit 14 (BN), harness side and the headlamp switch C205b pin, circuit 14 (BN), harness side; and between the headlamp switch C205a pin 12, circuit 14 (BN), harness side and ground.
      Fig 2: Checking Circuit 14 (BN) For Open Or Short To Ground
      G03910664Courtesy of FORD MOTOR CO.
    • Is the resistance less than 5 ohms between the headlamp switch connectors, and greater than 10,000 ohms between the headlamp switch and ground? 
    • Yes  : GO to A4.
    • No  : REPAIR the circuit. TEST the system for normal operation.
  4. A4 CHECK CIRCUIT 57 (BK) FOR AN OPEN 
    • Place the headlamp switch in the OFF position.
    • Measure the resistance between the headlamp switch C205b pin 4, circuit 57 (BK), harness side and ground.
      Fig 3: Checking Circuit 57 (BK) For Open
      G03924702Courtesy of FORD MOTOR CO.
    • Is the resistance less than 5 ohms between the headlamp switch and ground? 
    • Yes  : GO to A5.
    • No  : REPAIR the circuit. TEST the system for normal operation.
  5. A5 CHECK CIRCUIT 19 (LB/RD) FOR AN OPEN OR A SHORT TO GROUND 
    • Disconnect: Audio Unit C290a.
    • Measure the resistance between the headlamp switch C205b pin 1, circuit 19 (LB/RD), harness side and the audio unit C290a pin 3, circuit 19 (LB/RD), harness side; and between the headlamp switch C205b pin 1, circuit 19 (LB/RD), harness side and ground.
      Fig 4: Checking Circuit 19 (LB/RD) For Open Or Short To Ground
      G03924703Courtesy of FORD MOTOR CO.
    • Is the resistance less than 5 ohms between the audio unit and the headlamp switch, and greater than 10,000 ohms between the audio unit and ground? 
    • Yes  : INSTALL a new headlamp switch. REFER to EXTERIOR LIGHTING . TEST the system for normal operation.
    • No  : REPAIR the circuit. TEST the system for normal operation.
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