Pinpoint Test E: The Steering Wheel Switch Illumination Is Inoperative

Instrument Cluster and Panel Illumination

Pinpoint Test E: The Steering Wheel Switch Illumination Is Inoperative

Refer to Wiring Diagram Set 71, Cluster and Panel Illumination for schematic and connector information [1][2]Diagrams By Number.

Normal Operation

When the parking lamps are on, the Smart Junction Box (SJB) sends a pulse-width modulated voltage to the steering wheel switches. The voltage then passes through the clockspring to the steering wheel harness and then to the steering wheel control switch(es).

This pinpoint test is intended to diagnose the following:

- Wiring, terminals or connectors

- Steering wheel harness

- Steering wheel switch(es)

- Clockspring

PINPOINT TEST E : THE STEERING WHEEL SWITCH ILLUMINATION IS INOPERATIVE

NOTICE: Use the correct probe adapter(s) when making measurements. Failure to use the correct probe adapter(s) may damage the connector.

E1 CHECK THE OTHER DIMMABLE LIGHTING SWITCHES

- Ignition OFF.

- Place the headlamp switch in the PARKING LAMPS ON position.

- Rotate the instrument panel dimmer switch to the full illumination position and observe the other dimmable switches.

Are all the dimmable switches inoperative?

Yes
GO to Pinpoint Test C Pinpoint Test C: All Dimmable Switch Illumination Is Inoperative.

No
GO to E2.

E2 CHECK FOR VOLTAGE TO THE CLOCKSPRING

- Place the headlamp switch in the OFF position.

- Depower the Supplemental Restraint System (SRS). Refer to Restraints and Safety Systems &/or Air Bag Systems.

- Disconnect: Clockspring C2274.

- Connect: Negative Battery Cable.

- Ignition ON.

- Place the headlamp switch in the PARKING LAMPS ON position.

- Rotate the instrument panel dimmer switch to the full illumination position.

- Measure the voltage between the clockspring C2274-16, circuit VLN04 (VT/GY), harness side and ground.





Is the voltage greater than 10 volts?

Yes
GO to E3.

No
REPAIR circuit VLN04 (VT/GY) for an open. REPOWER the SRS (Supplemental Restraint System). REFER to Restraints and Safety Systems &/or Air Bag Systems. TEST the system for normal operation.

E3 CHECK FOR VOLTAGE TO THE CLOCKSPRING USING THE CONNECTOR GROUND

- Measure the voltage between the clockspring C2274-16, circuit VLN04 (VT/GY), harness side and the clockspring C2274-5, circuit GD116 (BK/VT), harness side.





Is the voltage greater than 10 volts?

Yes
GO to E4.

No
REPAIR circuit GD116 (BK/VT) for an open. REPOWER the SRS (Supplemental Restraint System). REFER to Restraints and Safety Systems &/or Air Bag Systems. TEST the system for normal operation.

E4 CHECK THE CLOCKSPRING FOR AN OPEN

- Place the headlamp switch in the OFF position.

- Remove the driver air bag module.

- Disconnect: Upper Clockspring Connector.

- Measure the resistance between the clockspring C2274 pin 5, component side and the upper clockspring connector pin 4, component side.





- Measure the resistance between the clockspring C2274 pin 16, component side and the upper clockspring connector pin 5, component side.





Are the resistances less than 5 ohms?

Yes
GO to E5.

No
INSTALL a new clockspring. TEST the system for normal operation.

E5 CHECK THE STEERING WHEEL HARNESS

- Inspect the steering wheel harness for opens.

Is the steering wheel harness OK?

Yes
INSTALL a new steering wheel control switch. INSTALL the driver air bag module. TEST the system for normal operation.

No
REPAIR or INSTALL a new steering wheel harness. INSTALL the driver air bag module. TEST the system for normal operation.