Steering Wheel Controls Inoperative
Steering Wheel Controls Inoperative
Diagnostic Instructions
* Perform the Diagnostic System Check - Vehicle (Initial Inspection and Diagnostic Overview) prior to using this diagnostic procedure.
* Review Strategy Based Diagnosis (Initial Inspection and Diagnostic Overview) for an overview of the diagnostic approach.
* Diagnostic Procedure Instructions (Initial Inspection and Diagnostic Overview) provides an overview of each diagnostic category.
Diagnostic Fault Information
Circuit/System Description
The radio supplies voltage to the audio steering wheel control momentary contact switches and monitors the return signal. Each switch is associated to a set resistance value and when pressed a specific voltage drops across the resistor unique to that switch. The radio will perform the desired function, or send a serial data message to another component to perform the switch desired function.
Diagnostic Aids
* If a single switch function is inoperative, test the suspect switch.
* The resistance value for the individual steering wheel control switches (right) should be within the listed resistance values below:
Reference Information
Schematic Reference
Steering Wheel Secondary/Configurable Control Schematics (Steering Wheel Secondary/Configurable Control Schematics)
Connector End View Reference
Component Connector End Views (Connector Views)
Description and Operation
Steering Wheel Controls Description and Operation (Steering Wheel Controls Description and Operation)
Electrical Information Reference
* Circuit Testing (Component Tests and General Diagnostics)
* Connector Repairs (Component Tests and General Diagnostics)
* Testing for Intermittent Conditions and Poor Connections (Component Tests and General Diagnostics)
* Wiring Repairs (Component Tests and General Diagnostics)
Scan Tool Reference
Control Module References (Programming and Relearning)
Circuit/System Verification
Ensure the primary controls of the associated component are functioning properly.
Circuit/System Testing
1. Ignition OFF, disconnect the harness connector at the right steering wheel control switch.
2. Ignition ON, Radio ON, test for 9.5-10.5 volts between the 10-volt reference circuit terminal 2 and ground.
• If less than the specified range, test the circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the radio.
• If greater than the specified range, test the circuit for a short to voltage. If the circuit tests normal, replace the radio.
3. Test for 9.5-10.5 volts between the 10-volt reference circuit terminal 2 and the signal circuit terminal 4.
• If less than the specified range, test the signal circuit for an open/high resistance. If the circuit tests normal, replace the radio.
• If greater than the specified range, test the signal circuit for a short to voltage. If the circuit tests normal, replace the radio.
4. Disconnect the X1 harness connector at the radio.
5. Test for infinite resistance between the signal circuit terminal 11 and ground.
• If not the specified value, test the signal circuit for short to ground.
6. If all circuits test normal, test or replace the steering wheel control switch.
Component Testing
1. Ignition OFF, disconnect the harness connector at the right steering wheel control switch.
2. Test for infinite resistance between the signal circuit terminal 4 and the 10-volt reference terminal 2 with the switch in the open position.
• If not the specified value, replace the right steering wheel control switch.
3. Test for less than 3200 ohms between the signal circuit terminal 4 and the 10-volt reference terminal 2 with the switch in the closed position.
• If greater than the specified value, replace the right steering wheel control switch.
Repair Instructions
Perform the Diagnostic Repair Verification (Verification Tests) after completing the diagnostic procedure.
* Steering Wheel Control Switch Assembly Replacement (Service and Repair)
* Control Module References (Programming and Relearning) for radio replacement, setup, and programming