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Pinpoint Test A: The Control Illumination Is Inoperative

  1. A1 CHECK THE PARKING LAMPS 
    • Key in OFF position.
    • Place the headlamp switch in the ON position.
    • Are the exterior lamps on? 
  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: Measuring Voltage Between Headlamp Switch C205B Pin 6, Circuit 14 (BN), Harness Side And Ground
      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 6, 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 An Open Or A 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  : 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.
  4. A4 CHECK CIRCUIT 19 (LB/RD) FOR AN OPEN OR A SHORT TO GROUND 
    • Disconnect: Audio Unit C290a.
    • Place the headlamp switch in the OFF position.
    • Measure the resistance between the headlamp switch C205b pin 1, circuit 19 (LB/RD), harness side and the audio unit C290a pin 1, circuit 19 (LB/RD), harness side; and between the headlamp switch C205b pin 1, circuit 19 (LB/RD), harness side and ground.
      Fig 3: Checking Circuit 19 (LB/RD) For An Open Or A Short To Ground
      G03910665Courtesy 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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