Service Information

Spark

Steering Wheel Controls Malfunction

Diagnostic Instructions

•	Perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure.

•	Review Strategy Based Diagnosis for an overview of the diagnostic approach.

•	Diagnostic Procedure Instructions provides an overview of each diagnostic category.

The radio supplies voltage to the audio steering wheel control switch and monitors the return signal. Each switch state is associated to a set resistance value and when pressed a specific voltage drop occurs across the resistor unique to the switch. The radio identifies the switch selection and activates the feature.

Diagnostic Aids

•	This diagnostic is for the audio steering wheel controls.

•	Before diagnosis of the steering wheel controls, ensure the primary controls of the associated component are functioning properly.

•	If a single switch function is inoperative, test the suspect switch. Refer to Component Testing.

Reference Information

Electrical Information Reference

•	Circuit Testing

•	Wiring Repairs

•	Testing for Intermittent Conditions and Poor Connections

•	Connector Repairs

Scan Tool Reference

Control Module References for scan tool information

Circuit/System Testing

Ignition OFF, disconnect the X1 wiring harness plug at the inflatable restraint steering wheel module coil.
Ignition ON, test for B+ between the voltage reference circuit terminal 3 (X1) male side 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 radio.

Test for B+ between the voltage reference circuit terminal 3 (X1) male side and the signal circuit terminal 2 (X1) male side.

⇒	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 radio.

Ignition OFF, disconnect the X1 wiring harness plug at the radio.
Test for infinite resistance between the signal circuit terminal 2 (X1) male side at the inflatable restraint steering wheel module coil and ground.

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

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

Component Testing

Static Test

Disconnect the wiring harness plug at the inflatable restraint steering wheel module coil.
Test the resistance between the terminals 3 (X1) female side and 2 (X1) female side of the inflatable restraint steering wheel module coil.

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

Function Switch	Minimum Resistance Value	Maximum Resistance Value
Volume Up	9.5k	10.5k
Volume Down	12.6k	14.0k
Seek	18.9k	20.9k
Mode	25.4k	28.0k
Power	30.1k	33.3k

Repair Instructions

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

Steering Wheel Control Switch Assembly Replacement