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Pinpoint Test F: A Single Illumination Source Is Inoperative - Steering Wheel Switches

  1. F1 CHECK THE VOLTAGE TO THE CLOCKSPRING CONNECTOR 
    • Key in OFF position.
    • Disconnect: Clockspring C218a.
    • Place the headlamp switch in the ON position.
    • Rotate the panel dimmer switch to the full illumination position.
    • Measure the voltage between clockspring C218a pin 5, circuit 19 (LB/RD), harness side and ground.
      Fig 1: Measuring Voltage Between Clockspring C218A Pin 5, Circuit 19 (LB/RD), Harness Side And Ground
      G03910672Courtesy of FORD MOTOR CO.
    • Is the voltage greater than 10 volts? 
    • Yes  : GO to F2.
    • No  : REPAIR the circuit. TEST the system for normal operation.
  2. F2 CHECK CIRCUIT 57 (BK) ON THE CLOCKSPRING 
    • Place the headlamp switch in the OFF position.
    • Measure the resistance between clockspring C218a pin 7, circuit 57 (BK), harness side and ground.
      Fig 2: Measuring Resistance Between Clockspring C218A Pin 7, Circuit 57 (BK), Harness Side And Ground
      G03910673Courtesy of FORD MOTOR CO.
    • Is the resistance less than 5 ohms? 
    • Yes  : CONNECT the clockspring C218a. GO to F3.
    • No  : REPAIR the circuit. TEST the system for normal operation.
  3. F3 CHECK THE CLOCKSPRING FOR VOLTAGE 
    • Remove the driver air bag module. Refer to SUPPLEMENTAL RESTRAINT SYSTEM .
    • Connect: Restraint System Diagnostic Tool 418-F088 (105-R0012) (2 req'd) to the Driver Air Bag Module Electrical Connectors.
    • Disconnect the steering wheel switch harness from the clockspring.
    • WARNING: Make sure there is no one inside the vehicle and that there is nothing blocking or set in front of any air bag module when the battery is connected. Failure to follow these instructions may result in personal injury. Connect the battery.
    • Place the headlamp switch in the ON position.
    • Rotate the panel dimmer switch to the full illumination position.
    • Measure the voltage between upper clockspring connector pin 1, component side and ground.
      • Fig 3: Measuring Voltage Between Upper Clockspring Connector Pin 1, Component Side And Ground
      G03910674Courtesy of FORD MOTOR CO.
    • Is the voltage greater than 10 volts? 
  4. F4 CHECK THE CLOCKSPRING FOR GROUND 
    • Place the headlamp switch in the OFF position.
    • Measure the resistance between upper clockspring connector pin 2 (component side), and ground.
      Fig 4: Measuring Resistance Between Upper Clockspring Connector Pin 2 (Component Side), And Ground
      G03910675Courtesy of FORD MOTOR CO.
    • Is the resistance less than 5 ohms? 
  5. F5 CHECK THE STEERING WHEEL CONTROL SWITCH HARNESS 
    • Inspect the steering wheel control switch harness for shorts, opens, or any damage.
    • Is the steering wheel control switch harness OK? 
    • Yes  : INSTALL a new steering wheel control switch(es). DISCONNECT the battery. INSTALL the driver air bag module. REFER to SUPPLEMENTAL RESTRAINT SYSTEM . TEST the system for normal operation.
    • No  : INSTALL a new steering wheel control switch harness. DISCONNECT the battery. INSTALL the driver air bag module. REFER to SUPPLEMENTAL RESTRAINT SYSTEM . TEST the system for normal operation.
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