Steering Wheel Controls Malfunction
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Steering Wheel Controls Malfunction
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Diagnostic Fault Information
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Circuit
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Short to Ground
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Open/High Resistance
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Short to Voltage
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Signal Performance
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12V Reference
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1
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1
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-
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1
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Steering Wheel Control Switch Signal
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1
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1
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1
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-
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1. Steering Wheel Controls Inoperative
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Circuit/System Description
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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.
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This diagnostic is for the audio steering wheel controls.
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Before diagnosis of the steering wheel controls, ensure the primary controls of the associated component are functioning properly.
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If a single switch function is inoperative, test the suspect switch. Refer to component testing.
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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
Scan Tool Reference
Control Module References
for scan tool information
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1.
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Ignition OFF, disconnect the X1 harness connector at the X85 Steering Wheel Air Bag Coil.
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2.
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Ignition ON, test for greater than 11 V between the voltage reference circuit terminal 5 X1 male side and ground.
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3.
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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.
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4.
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Test for greater than 11 V between the voltage reference circuit terminal 5 X1 male side and the signal circuit terminal 4 X1 male side.
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5.
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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.
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6.
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Ignition OFF, disconnect the X3 harness connector at the K9 Body Control Module.
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7.
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Test for infinite resistance between the signal circuit terminal 52 X3 male side at the X85 Steering Wheel Air Bag Coil and ground.
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8.
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If less than the specified value, test the signal circuit for a short to ground.
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9.
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If all circuits test normal, test or replace the S70R Steering Wheel Controls Switch - Right.
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Static Test
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1.
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Disconnect the harness connector at the X85 Steering Wheel Air Bag Coil.
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2.
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Test the resistance between the terminals 5 X1 female side and 4 X1 female side of the X85 Steering Wheel Air Bag Coil.
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3.
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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.
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Function Switch
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Minimum Resistance Value
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Maximum Resistance Value
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Volume Up
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1.0 kΩ
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1.4 kΩ
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Volume Down
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1.3 kΩ
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1.7 kΩ
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Seek Up
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3.4 kΩ
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4.2 kΩ
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Seek Down
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2.0 kΩ
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2.8 kΩ
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Source
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2.8 kΩ
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3.2 kΩ
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Phone/Push to Talk
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3.6 kΩ
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4.0 kΩ
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Hang Up/Audio Mute
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5.1 kΩ
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5.5 kΩ
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No Switch Pressed
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O.L.
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O.L.
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Perform the
Diagnostic Repair Verification
after completing the diagnostic procedure.
See
Control Module References
for BCM replacement, setup and programming
