Steering Wheel Controls Malfunction
Steering Wheel Controls Malfunction
Diagnostic Instructions
* Perform the Diagnostic System Check - Vehicle Diagnostic System Check - Vehicle prior to using this diagnostic procedure.
* Review Strategy Based Diagnosis Strategy Based Diagnosis for an overview of the diagnostic approach.
* Diagnostic Procedure Instructions Diagnostic Procedure Instructions provides an overview of each diagnostic category.
Diagnostic Fault Information
Circuit/System Description
The body control module (BCM) supplies voltage to the audio steering wheel control switches 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 BCM identifies the switch selection and activates the feature.
Reference Information
Schematic Reference
Steering Wheel Secondary/Configurable Control Schematics Steering Wheel Secondary/Configurable Control Schematics
Connector End View Reference
Component Connector End Views Sunshade - Left (D61)
Description and Operation
Steering Wheel Controls Description and Operation Steering Wheel Controls
Electrical Information Reference
* Circuit Testing Circuit Testing
* Connector Repairs Connector Repairs
* Testing for Intermittent Conditions and Poor Connections Testing for Intermittent Conditions and Poor Connections
* Wiring Repairs Wiring Repairs
Scan Tool Reference
Control Module References Control Module References for scan tool information
Circuit/System Verification
1. Ignition ON.
2. Verify the primary controls of the associated component are functioning properly.
• If any of the primary controls do not function properly
Refer to Symptoms - Entertainment Symptoms - Entertainment
• If all of the primary controls function properly
3. Refer to Circuit/System Testing.
Circuit/System Testing
1. Ignition OFF and all vehicle systems OFF, disconnect the X1 harness connector at the S70R Steering Wheel Controls Switch - Right, ignition ON.
2. Test for 11.8-12.2 V between the reference voltage circuit terminal 1 and ground.
• If less than 11.8 V
1. Ignition OFF, disconnect the harness connector at the K9 body control module.
2. Test for infinite resistance between the reference voltage circuit and ground.
• If less than infinite resistance, repair the short to ground on the circuit.
• If infinite resistance
3. Test for less than 2 ohms in the reference voltage circuit end to end.
• If 2 ohms or greater, repair the open/high resistance in the circuit.
• If less than 2 ohms, replace the K9 body control module.
• If greater than 12.2 V
1. Ignition OFF, disconnect the harness connector at the K9 body control module, ignition ON.
2. Test for less than 1 V between the reference voltage circuit and ground.
• If 1 V or greater, repair the short to voltage on the circuit.
• If less than 1 V, replace the K9 body control module.
• If between 11.8-12.2 V
3. Test for 11.8-12.2 V between the reference voltage circuit terminal 1 and signal circuit terminal 2.
• If not between 11.8-12.2 V
1. Ignition OFF, disconnect the harness connector at the K9 body control module.
2. Test for less than 1 V between the signal circuit and ground.
• If 1 V or greater, repair the short to voltage on the circuit.
• If less than 1 V
3. Test for less than 2 ohms in the signal circuit end to end.
• If 2 ohms or greater, repair the open/high resistance in the circuit.
• If less than 2 ohms replace the K9 body control module.
• If between 11.8-12.2 V
4. Ignition OFF, disconnect the harness connector at the K9 body control module.
5. Test for infinite resistance between the signal circuit terminal 2 and ground.
• If less than infinite resistance
Repair the short to ground on the circuit.
• If infinite resistance
6. Test or replace the S70R Steering Wheel Controls Switch - Right.
Component Testing
1. Ignition OFF, disconnect the X1 harness connector at the S70R Steering Wheel Controls Switch - Right.
2. Test the resistance between the signal terminal 2 and the reference voltage terminal 1 while pressing the appropriate steering wheel controls switch button listed below:
• If not the specified value
Replace the S70R Steering Wheel Controls Switch - Right.
• If the specified value
3. All OK
Repair Instructions
Perform the Diagnostic Repair Verification Verification Tests after completing the repair.
Control Module References Control Module References for BCM replacement, programming and setup