Pinpoint Test D: The Steering Wheel Switch(Es) Illumination Is Inoperative

D1 CHECK OTHER NON-NETWORK DIMMABLE LIGHTING SOURCES
- Ignition OFF.
- Place the headlamp switch in the parking lamps on position.
- Using the instrument panel dimmer switch, change the dimmable backlighting to its brightest setting.
- Are all non-networked dimmable backlighting sources inoperative?
- Yes : GO to PINPOINT TEST A .
- No : If all steering wheel switches do not illuminate, GO to D2.
  If an individual steering wheel switch does not illuminate, GO to D5.
D2 CHECK THE HORN OPERATION
- Push the driver air bag against the steering wheel to activate the horn.
- Does the horn sound?
- Yes : GO to D3.
- No : REFER to HORN .

D3 CHECK THE STEERING WHEEL BACKLIGHTING VOLTAGE SUPPLY CIRCUIT FOR AN OPEN

Measure the voltage between:

Positive Lead		Negative Lead
Pin	Circuit	Pin	Circuit
C218A-9	VLN04 (VT/GY)	-	Ground

Fig 1: Checking Steering Wheel Backlighting Voltage Supply Circuit For Open

Courtesy of FORD MOTOR CO.

D4 CHECK THE STEERING WHEEL AND HARNESS

Connect: Clockspring C218A.
Remove the driver air bag module. Refer to SUPPLEMENTAL RESTRAINT SYSTEM .
Disconnect: Clockspring C218B.
Connect: Battery Ground Cable.
Place the headlamp switch in the parking lamps on position.
Using the instrument panel dimmer switch, change the dimmable backlighting to its brightest setting.

Measure the component side voltage between:

Positive Lead		Negative Lead
Pin	Circuit	Pin	Circuit
C218B-9	VLN04	-	Ground

Fig 2: Identifying Steering Wheel Connector Terminals

Courtesy of FORD MOTOR CO.

Yes : REPAIR the steering wheel harness for an open or INSTALL a new steering wheel. REFER to STEERING COLUMN .
No : INSTALL a new clockspring. REFER to SUPPLEMENTAL RESTRAINT SYSTEM .

D5 CHECK THE SUSPECT STEERING WHEEL SWITCH FOR VOLTAGE

Remove the driver air bag module. Refer to SUPPLEMENTAL RESTRAINT SYSTEM .
Disconnect: Inoperative LH Steering Wheel Switch C2998 or RH Steering Wheel Switch C2999.
Connect: Battery Ground Cable.
Place the headlamp switch in the parking lamps on position.
Using the instrument panel dimmer switch, change the dimmable backlighting to its brightest setting.

Measure the voltage between:

Fig 3: Identifying Steering Wheel Switch Connector Terminals

Courtesy of FORD MOTOR CO.

Yes : INSTALL a new LH or RH steering wheel switch.
REFER to STEERING COLUMN SWITCHES .
No : REPAIR the steering wheel harness for an open or INSTALL a new steering wheel. REFER to STEERING COLUMN .