Steering Wheel Controls Malfunction
Diagnostic Instructions
Diagnostic Fault Information
Circuit
|
Short to Ground
|
Open/High Resistance
|
Short to Voltage
|
Signal Performance
|
12V Reference
|
B1529 03, B1405 03
|
1
|
B1529 07
|
B1529 07
|
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 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.
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. |
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
Scan Tool Reference
Control Module References for scan tool information
Circuit/System Testing
| 1. |
Ignition OFF, disconnect the
S70R Steering Wheel Controls Switch - Right. |
| 2. |
Ignition ON, test for greater
than 11 V between the voltage reference circuit terminal 1 and
ground. |
| ⇒ |
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 1 and the signal
circuit terminal 2. |
| ⇒ |
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 2 at the S70R Steering Wheel
Controls Switch - Right and ground. |
| ⇒ |
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. |
Repair Instructions
Perform the
Diagnostic Repair Verification after completing the diagnostic
procedure.
Control Module References for BCM replacement, setup, and
programming
|
