Steering Wheel Controls Inoperative Preset/Vol

The CD changer supplies voltage to the steering wheel control momentary contact switches and monitors the return signal. Each switch state is associated with a set resistance value and when the switch is pressed, a specific voltage drops across the resistor unique to the switch. The CD changer identifies the switch selected and activates the feature.

Schematic Reference

Steering Wheel Secondary/Configurable Control Schematics

Connector End View Reference

Component Connector End Views

Description and Operation

Steering Wheel Controls Description and Operation

Electrical Information Reference

Scan Tool Data List

Control Module References for scan tool information

1. Ignition OFF, disconnect the harness connector at the left and right steering wheel control switches.
2. Ignition ON, radio ON, test for 9.8-10.2 volts between the voltage reference circuit terminal 1 and ground.

⇒	If greater than the specified range, test the voltage reference circuit for a short to voltage. If the circuit tests normal, replace the CD changer.

⇒	If less than the specified range, test the voltage reference circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the CD changer.

3. Test for greater than 9.0 volts between the voltage reference circuit terminal 1 and the signal circuit terminals listed below:

•	Steering wheel control switch signal circuit terminal 6 - left switch

•	Steering wheel control switch signal circuit terminal 2 - right switch

⇒	If less than the specified range, test the signal circuits for a short to voltage or an open/high resistance. If the circuits test normal, replace the CD changer.

4. Ignition OFF, disconnect the X1 harness connector at the CD changer.
5. Test for infinite resistance between ground and the signal circuit terminals listed below:

•	Steering wheel control switch signal circuit terminal 6 - left switch

•	Steering wheel control switch signal circuit terminal 2 - right switch

⇒	If less than the specified value, test the signal circuit for a short to ground.

6. Ignition ON, test for less than 1 volt between ground and the voltage reference circuit terminal 5 at the left steering wheel control switch.

⇒	If greater than the specified range, test the voltage reference circuit for a short to voltage

7. Ignition ON, test for infinite resistance between ground and the voltage reference circuit terminal 5 at the left steering wheel control switch.

⇒	If not the specified value, test the voltage reference circuit for a short to ground.

8. Test for less than 1 ohm between the voltage reference circuit terminal 5 at the left steering wheel control switch and the voltage reference circuit terminal 5 at the right steering wheel control switch.

⇒	If greater than the specified range, test the voltage reference circuit for a an open/high resistance.

9. If all circuits test normal, test or replace the left or right steering wheel control switch.

1. Disconnect the harness connector at the right or left steering wheel control switch.
2. Connect a DMM between terminal 5 (left switch) and terminal 6 (left switch) or terminal 1 (right switch) and terminal 2 (right switch) of either the left or right steering wheel control switches.

⇒	If any of the resistance measurements for the individual switches are not within the specified resistance values, replace the right steering wheel control switch.

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

Steering Wheel Controls Inoperative Mute/Seek

The body control module (BCM) supplies voltage to the MUTE/SEEK + multiple momentary contact switch and monitors the steering wheel control switch 2 signal circuit. Each switch state is associated with a set resistance value and when the switch is pressed, a specific voltage drops across the resistor unique to that switch.

This diagnostic is for the audio steering wheel controls for vehicles not equipped with RPO K59 adaptive cruise.

Schematic Reference

Steering Wheel Secondary/Configurable Control Schematics

Connector End View Reference

Component Connector End Views

Description and Operation

Steering Wheel Controls Description and Operation

Electrical Information Reference

Scan Tool Data List

Control Module References for scan tool information

1. Ignition OFF, disconnect the harness connector at the left steering wheel control switch.
2. Ignition ON, test for B+ between the voltage reference circuit terminal 1 and ground.

⇒	If less than the specified value, test the voltage reference circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the BCM.

3. Test for B+ between the voltage reference circuit terminal 1 and the signal circuit terminal 2.

⇒	If less than the specified value, test the signal circuit for a short to voltage or an open/high resistance. If the circuit tests normal, replace the BCM.

4. Ignition OFF, disconnect the X1 harness connector at the BCM.
5. Test for infinite resistance between the signal circuit terminal 1 and ground.

⇒	If less than the specified value, test the signal circuit for a short to ground.

6. If all circuits test normal, test or replace the left steering wheel control switch.

1. Disconnect the harness connector at the left steering wheel control switch.
2. Connect a DMM between terminals 1 and 2 of the left steering wheel control switch.

⇒	If any of the resistance measurements for the individual switches are not within the specified resistance values, replace the right steering wheel control switch.

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.