2010 Cadillac CTS Sedan AWD V6-3.6L Page 403
DTC B1529
Diagnostic Instructions
* Perform the Diagnostic System Check - Vehicle (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Diagnostic System
Check - Vehicle) prior to using this diagnostic procedure.
* Review Strategy Based Diagnosis (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Strategy Based Diagnosis) for an
overview of the diagnostic approach.
* Diagnostic Procedure Instructions (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Diagnostic Procedure
Instructions) provides an overview of each diagnostic category.
DTC Descriptors
DTC B1529 03
- Device Voltage Reference Output Circuit Voltage Below Threshold
DTC B1529 07
- Device Voltage Reference Output Circuit Voltage Above Threshold
Diagnostic Fault Information
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.
Conditions for Running the DTC
* Battery voltage is between 9-16 volts
* The ignition is ON.
Conditions for Setting the DTC
B1529 03
* The BCM detects a short to ground in the B+ voltage reference circuit.
* The above condition is present for greater than 30 seconds.
B1529 07
* The BCM detects a short to voltage in the B+ voltage 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 (See: Accessories and Optional Equipment/Diagrams/Electrical Diagrams/Steering
Wheel Secondary/Configurable Control Schematics)
Connector End View Reference
Component Connector End Views (See: Diagrams/Connector Views)
Description and Operation
Steering Wheel Controls Description and Operation (See: Accessories and Optional Equipment/Description and Operation/Steering Wheel
Controls Description and Operation)
