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

D1 INSPECT THE DIMMABLE NON-NETWORKED ILLUMINATION SOURCES
- Ignition ON.
- Place the headlamp switch in the PARKING LAMPS ON position.
- Place a shop light above the instrument panel ambient light sensor to make sure the BCM outputs maximum illumination voltage.
- While pressing the instrument panel dimmer switch up and down, monitor the dimmable non-networked illumination sources.
Are all of the dimmable non-networked illumination source inoperative or always on?
- Yes : If all dimmable non-networked illumination sources are always on, GO to PINPOINT TEST C
  If all dimmable non-networked illumination sources are inoperative, GO to PINPOINT TEST B
- No : If all steering wheel switches illumination is inoperative, GO to D2
  If the LH switch illumination is inoperative, GO to D6
  
  If the RH switch illumination is inoperative, GO to D7
D2 CHECK THE HORN OPERATION
- Press the airbag module against the steering wheel.
Does the horn sound?
- Yes : GO to D3
- No : REFER to: HORN .

D3 CHECK FOR ILLUMINATION VOLTAGE AND GROUND AT THE CLOCKSPRING

Place the headlamp switch in the OFF position.
Ignition OFF.
WARNING: Turn the ignition OFF and wait one minute to deplete the backup power supply. Failure to follow this instruction may result in serious personal injury or death in the event of an accidental deployment.

Wait one minute.
Disconnect Clockspring C218B .
Ignition ON.
Place the headlamp switch in the PARKING LAMPS ON position.
Press and hold the instrument panel dimmer switch up to the full illumination position.

Measure:

Positive Lead	Measurement/Action	Negative Lead
C218B-13		C218B-15

Is the voltage greater than 11 volts?

Yes : GO to D5
No : GO to D4

D4 CHECK FOR ILLUMINATION VOLTAGE AT THE CLOCKSPRING

Measure:

Positive Lead	Measurement/Action	Negative Lead
C218B-13		Ground

Is the voltage greater than 11 volts?

Yes : REPAIR the illumination ground circuit
No : REPAIR the illumination circuit.

D5 CHECK FOR ILLUMINATION VOLTAGE AND GROUND TO THE STEERING WHEEL SWITCHES

Place the headlamp switch in the OFF position.
Ignition OFF.
Remove the driver airbag.
REFER to: DRIVER AIRBAG .
Connect Clockspring C218B .
Disconnect Clockspring C218C .
Place the headlamp switch in the PARKING LAMPS ON position.
Ignition ON.

Measure:

Positive Lead	Measurement/Action	Negative Lead
C218C-7 (component side)		C218C-5 (component side)

Is the voltage greater than 11 volts?

Yes : INSTALL a new steering wheel.
REFER to: STEERING WHEEL .
No : INSTALL a new clockspring.
REFER to: CLOCKSPRING .

D6 CHECK THE LH (LEFT-HAND) STEERING WHEEL SWITCH

Ignition OFF.
WARNING: Turn the ignition OFF and wait one minute to deplete the backup power supply. Failure to follow this instruction may result in serious personal injury or death in the event of an accidental deployment.

Wait one minute.
Remove the driver airbag.
REFER to: DRIVER AIRBAG .
Disconnect LH Steering Wheel Switch C2998 .
Ignition ON.

Measure:

Positive Lead	Measurement/Action	Negative Lead
C2998-3		C2998-1

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 .

D7 CHECK THE RH (RIGHT-HAND) STEERING WHEEL SWITCH

Ignition OFF.
WARNING: Turn the ignition OFF and wait one minute to deplete the backup power supply. Failure to follow this instruction may result in serious personal injury or death in the event of an accidental deployment.

Wait one minute.
Remove the driver airbag.
REFER to: DRIVER AIRBAG DRIVER AIRBAG .
Disconnect RH Steering Wheel Switch C2999 .
Ignition ON.

Measure:

Positive Lead	Measurement/Action	Negative Lead
C2999-3		C2999-1

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 .