Steering Wheel Controls Inoperative (Preset/Vol)
Steering Wheel Controls Inoperative (Preset/Vol)
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) provide an overview of each diagnostic category.
Circuit/System Description
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.
Diagnostic Aids
* 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.
* A poor connection at the right switch could cause both banks of switches to be inoperative or malfunction.
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 Data List
Control Module References (Programming and Relearning)
Circuit/System Verification
Ignition ON, observe the scan tool Band status parameter while pressing and releasing the source switch. The reading should change bands.
Circuit/System Testing
Important: It is recommended that Component Testing be performed before Circuit Testing when diagnosing steering wheel controls.
Caution: Refer to SIR Caution (SIR Caution) .
1. Ignition OFF, disconnect the X2 harness connector at the steering wheel control switch.
2. Ignition ON, test for 9.5-10.5 volts between the ignition circuit terminal 3 and ground.
• If less than the specified range, test the ignition circuit for a short to ground, or an open/high resistance. If the circuit tests normal, replace the CD changer.
• If greater than the specified range, test the ignition circuit for a short to voltage. If the circuit tests normal, replace the CD changer
3. Test for 9.5-10.5 volts between the ignition circuit terminal and the signal circuit terminal 5.
• If less than the specified range, test the signal circuit for an open/high resistance. If the circuit tests normal, replace the CD changer.
• If greater than the specified range, test the signal circuit for a short to voltage. If circuit test normal , replace the CD changer.
4. Install a 3A fused jumper wire between the ignition terminal 3 and the signal circuit terminal 4.
5. Disconnect the X1 harness connector at the steering wheel controls.
6. Test for 9.5-10.5 volts between the signal circuit terminal 1 and ground.
• If less than the specified range, test the signal circuit for a short to ground or an open/high resistance. If the circuit tests normal, test or replace the switch.
• If greater than the specified range, test the signal circuit for a short to voltage. If the circuit tests normal, test or replace the switch.
7. Test for 9.5-10.5 volts between the signal circuit terminal 1 and the signal circuit terminal 2.
• If less than the specified range, test the signal circuit for an open/high resistance. If the circuit tests normal, replace the CD Changer.
• If greater than the specified range, test the signal circuit for a short to voltage. If the circuit tests normal, replace the CD Changer.
8. Ignition OFF, disconnect the X1 harness connector at the CD Changer.
9. Test for infinite resistance between the signal circuit terminal 11 and ground.
• If less than the specified range, test the signal circuit for a short to ground.
10. If all circuits test normal, test or replace the steering wheel control switch.
Component Testing
Caution: Refer to SIR Caution (SIR Caution) .
1. Ignition OFF, disconnect the X2 harness connector at the steering wheel control switch.
2. Test for less than 2,400 ohms between the ignition circuit terminal 3 and signal circuit terminal 4.
• If not the specified value, replace the steering wheel control switch.
3. Test for infinite resistance between the ignition circuit terminal 3 and the signal circuit terminal 5 with the switch in the open position.
• If not the specified value, replace the steering wheel control switch.
4. Test for less than 2,400 ohms between the ignition circuit terminal 3 and the signal circuit terminal 5 with the switch in the closed position.
• If not the specified value, replace the steering wheel control switch.
5. Disconnect the X1 harness connector at the steering wheel control switch.
6. Test for infinite resistance between the signal circuit terminal 1 and the signal circuit terminal 2.
• If not the specified value, replace the steering wheel control switch.
7. Test for less than 2,000 ohms between the signal circuit terminal 1 and the signal circuit terminal 2.
• If not the specified value, replace the 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)
* Remote CD Changer Replacement (Removal and Replacement)