B1529

DTC B1529

Diagnostic Instructions

* Perform the Diagnostic System Check - Vehicle (Diagnostic System Check - Vehicle) prior to using this diagnostic procedure.
* Review Strategy Based Diagnosis (Strategy Based Diagnosis) for an overview of the diagnostic approach.
* Diagnostic Procedure Instructions (Diagnostic Procedure Instructions) provides an overview of each diagnostic category.

DTC Descriptor
DTC B1529 03
- Control Module Voltage Reference Output 5 Circuit Low Voltage

DTC B1529 07
- Control Module Voltage Reference Output 5 Circuit High Voltage

Diagnostic Fault Information
Electrical DTCs





Circuit/System Description

The body control module (BCM) supplies voltage to the 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.

Conditions for Running the DTC

* The system voltage is between 9-16 V.
* The ignition is ON.

Conditions for Setting the DTC
B1529 03

* The BCM detects a short to ground in the 12 V reference circuit.
* The above condition is present for greater than 30 s.

B1529 07

* The BCM detects a short to voltage in the 12 V reference circuit.
* The above condition is present for greater than 30 seconds.

Action Taken When the DTC Sets

The BCM will ignore switch inputs.

Conditions for Clearing the DTC

* The condition responsible for setting the DTC no longer exists.
* A history DTC will clear once 100 consecutive malfunction free ignition cycles have occurred.

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)
Electrical Information Reference

* Circuit Testing (Circuit Testing)
* Connector Repairs (Connector Repairs)
* Testing for Intermittent Conditions and Poor Connections (Testing for Intermittent Conditions and Poor Connections)
* Wiring Repairs (Wiring Repairs)

Scan Tool Reference

Control Module References (Programming and Relearning) for scan tool information

Circuit/System Testing

1. Ignition OFF, disconnect the X2 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 (X2) male side 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 6 (X2) male side and the signal circuit terminal 7 (X2) male side.

• 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 X2 harness connector at the K9 Body Control Module.
5. Test for infinite resistance between the signal circuit terminal 7 (X2) male side at the X85 Steering Wheel Air Bag Coil 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.

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 (X2) female side and 7 (X2) female side of the X85 Steering Wheel Air Bag Coil.

• 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.





Repair Instructions

Perform the Diagnostic Repair Verification (Verification Tests) after completing the diagnostic procedure.

* Radio and Telephone Control Switch Replacement (Radio and Telephone Control Switch Replacement)
* Control Module References (Programming and Relearning) for BCM replacement, setup, and programming