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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.

Diagnostic Fault Information

Circuit

Short to Ground

Open/High Resistance

Short to Voltage

Signal Performance

12V Reference

B1529 03, B1405 03

1

--

B1529 05

Steering Wheel Control Switch Signal

1

1

B3622 07

--

1. Steering Wheel Controls Inoperative

Circuit/System Description

The body control module (BCM) supplies voltage to the audio steering wheel control switches and monitors the reindicator. 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.

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

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

    •  Circuit Testing
    •  Connector Repairs
    •  Testing for Intermittent Conditions and Poor Connections
    •  Wiring Repairs

Scan Tool Reference

Control Module References for scan tool information

Circuit/System Testing
  1. Ignition OFF, disconnect the X3 harness connector at the X85 Steering Wheel Air Bag Coil.
  2. Ignition ON, test for greater than 11 V between the voltage reference circuit terminal 6 X3 male side and ground.
    3. ⇒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 K9 Body Control Module.
  3. Test for greater than 11 V between the voltage reference circuit terminal 6 X3 male side and the signal circuit terminal 7 X3 male side.
    4. ⇒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 K9 Body Control Module.
  4. Ignition OFF, disconnect the X3 harness connector at the K9 Body Control Module.
  5. Test for infinite resistance between the signal circuit terminal 7 X3 male side at the X85 Steering Wheel Air Bag Coil and ground.
    6. ⇒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 S70R Steering Wheel Controls Switch - Right.

Component Testing

Static Test

  1. Disconnect the harness connector at the X85 Steering Wheel Air Bag Coil.
  2. Test the resistance between the terminals 6 X3 female side and 7 X3 female side of the X85 Steering Wheel Air Bag Coil.
    3. ⇒If any of the resistance measurements for the individual switches are not within the specified resistance values, replace the S70R Steering Wheel Controls Switch - Right.

Function Switch

Minimum Resistance Value

Maximum Resistance Value

Volume Up

1.0 kΩ

1.4 kΩ

Volume Down

1.3 kΩ

1.7 kΩ

Seek Up

1.7 kΩ

2.1 kΩ

Seek Down

2.2 kΩ

2.6 kΩ

Source

2.8 kΩ

3.2 kΩ

Phone/Push to Talk

3.6 kΩ

4.0 kΩ

Hang Up/Audio Mute

5.1 kΩ

5.5 kΩ

No Switch Pressed

O.L.

O.L.

Repair Instructions

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

    •  Radio Control Switch Replacement - Steering Wheel
    • Control Module References for BCM replacement, setup, and programming
   


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