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

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.

F1 CHECK CIRCUIT 19 (LB/RD) FOR AN OPEN
- Deactivate the air bag system. Refer to SUPPLEMENTAL RESTRAINT SYSTEM .
- Key in OFF position.
- Disconnect: Clockspring C218a.
- Place the headlamp switch in the ON position.
- Rotate the instrument panel dimmer switch to the full illumination position.
- Measure the voltage between clockspring C218a pin 6, circuit 19 (LB/RD), harness side and ground.
  
  Fig 1: Checking Circuit 19 (LB/RD) For Open
  Courtesy 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.
F2 CHECK CIRCUIT 57 (BK) FOR AN OPEN
- Place the headlamp switch in the OFF position.
- Measure the resistance between clockspring C218a pin 5, circuit 57 (BK), harness side and ground.
  
  Fig 2: Checking Circuit 57 (BK) For Open
  Courtesy of FORD MOTOR CO.
- Is the resistance less than 5 ohms?
- Yes : RECONNECT the clockspring. GO to F3.
- No : REPAIR the circuit. TEST the system for normal operation.
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 required) to the Driver Air Bag Module Electrical Connectors.
- Disconnect the steering wheel switch harness from the clockspring.
- Place the headlamp switch in the ON position.
- Rotate the instrument panel dimmer switch to the full illumination position.
- Measure the voltage between the upper clockspring connector pin 1, component side and ground.
  
  Fig 3: Checking Clockspring For Voltage
  Courtesy of FORD MOTOR CO.
- Is the voltage greater than 10 volts?
- Yes : DISCONNECT the battery. GO to F4.
- No : INSTALL a new clockspring. REFER to SUPPLEMENTAL RESTRAINT SYSTEM . TEST the system for normal operation. DISCONNECT the battery. REFER to BATTERY, MOUNTING AND CABLES . INSTALL the air bag. REFER to SUPPLEMENTAL RESTRAINT SYSTEM .
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: Checking Clockspring For Ground
  Courtesy of FORD MOTOR CO.
- Is the resistance less than 5 ohms?
- Yes : GO to F5.
- No : INSTALL a new clockspring. REFER to SUPPLEMENTAL RESTRAINT SYSTEM . TEST the system for normal operation.
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). TEST the system for normal operation.
- No : INSTALL a new steering wheel control switch harness. TEST the system for normal operation.