Pinpoint Test I: The Steering Wheel Switch(Es) Illumination Is Inoperative Or Always On

Refer to CLUSTER AND PANEL ILLUMINATION for schematic and connector information.
Normal Operation and Fault Conditions

REFER to: Instrument Panel and Interior Switches Illumination - System Operation and Component Description .

Possible Sources
- Wiring, terminals or connectors
- Steering wheel switch(es)
- Clockspring
- Steering wheel
WARNING: Incorrect repair techniques or actions can cause an accidental Supplemental Restraint System (SRS) deployment. Never compromise or depart from these instructions. Failure to precisely follow all instructions could result in serious personal injury from an accidental deployment.

I1 INSPECT THE NON-NETWORKED ILLUMINATION COMPONENTS

Ignition ON.

Place the headlamp switch in the PARKING LAMPS ON position.

While pressing the illumination dim up and dim down switch, monitor the non-networked illumination components.

Are all of the non-networked illumination sources inoperative or always on?

Yes	GO to Pinpoint Test C

No	If all steering wheel switch illumination is inoperative, GO to I3 If only one steering wheel switch is inoperative, GO to I7

I2 CHECK THE HORN OPERATION
- Press the airbag module against the steering wheel.
Does the horn sound?

Yes GO to I3

No REFER to: Horn .

I3 CHECK FOR ILLUMINATION VOLTAGE AT THE CLOCKSPRING

Ignition OFF.

Place the headlamp switch in the OFF position.

Disconnect SCCM C226A.

Depower the SRS. REFER to: Supplemental Restraint System (SRS) Depowering .

Remove the driver airbag. REFER to: Driver Airbag .

Place a light source over the ambient light sensor so the illumination can reach maximum brightness.

Place the headlamp switch in the PARKING LAMPS ON position.

Ignition ON.

Press the illumination dim up switch to the full illumination position.

Measure:

Positive Lead	Measurement / Action	Negative Lead
C226A-7	Courtesy of FORD MOTOR COMPANY	Ground

Is the voltage greater than 10 volts?

Yes

GO to I4

No	REPAIR the circuit

I4 CHECK THE ILLUMINATION GROUND CIRCUIT

Ignition OFF.

Place the headlamp switch in the OFF position.

Disconnect Clockspring C218A.

Ignition ON.

Place the headlamp switch in the PARKING LAMPS ON position.

Measure:

Positive Lead	Measurement / Action	Negative Lead
C226A-7	Courtesy of FORD MOTOR COMPANY	C218A-8

Is the voltage greater than 10 volts?

Yes

GO to I5

No	REPAIR the circuit.

I5 CHECK FOR VOLTAGE TO THE STEERING WHEEL HARNESS AT THE CLOCKSPRING

Ignition OFF.

Place the headlamp switch in the OFF position.

Connect SCCM C226A.

Connect Clockspring C218A.

Disconnect Clockspring C218B.

Ignition ON.

Place the headlamp switch in the PARKING LAMPS ON position.

Measure:

Positive Lead	Measurement / Action	Negative Lead
C218B pin 15 (component side)	Courtesy of FORD MOTOR COMPANY	C218B pin 4 (component side)

Is the voltage greater than 10 volts?

Yes	INSTALL a new steering wheel. REFER to: Steering Wheel .

GO to I6

I6 CHECK FOR VOLTAGE TO THE STEERING WHEEL HARNESS AT THE CLOCKSPRING

Ignition OFF.

Place the headlamp switch in the OFF position.

Disconnect Clockspring C218D.

Measure:

Positive Lead	Measurement / Action	Negative Lead
C218B pin 15 (component side)	Courtesy of FORD MOTOR COMPANY	C218D pin 9 (component side)

Is the resistance less then 3 ohms?

Yes	INSTALL a SCCM. REFER to: Steering Column Control Module (SCCM) .

No	INSTALL a new clockspring. REFER to: Clockspring .

I7 CHECK THE STEERING WHEEL HARNESS VOLTAGE CIRCUIT FOR AN OPEN

Ignition OFF.

Place the headlamp switch in the OFF position.

Depower the SRS. REFER to: Supplemental Restraint System (SRS) Depowering .

Remove the driver airbag. REFER to: Driver Airbag .

Disconnect Faulty Switch.

Ignition ON.

Place the headlamp switch in the PARKING LAMPS ON position.

While pressing the illumination dim up and dim down switch, monitor the non-networked illumination components.

Measure:

LH Steering Wheel Switch

Positive Lead	Measurement / Action	Negative Lead
C2998-1	Courtesy of FORD MOTOR COMPANY	C2998-6

RH Steering Wheel Switch

Positive Lead	Measurement / Action	Negative Lead
C2999-1	Courtesy of FORD MOTOR COMPANY	C2999-6

Is the voltage greater than 11 volts?

Yes	INSTALL a new steering wheel switch. REFER to: Steering Wheel Multifunction Switch .

No	INSTALL a new steering wheel. REFER to: Steering Wheel .