B291A

DTC B291A

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 B291A 39
- Content Theft Deterrent Assembly Internal Malfunction

Circuit/System Description

The content theft deterrent intrusion/inclination sensor performers an internal self-check to determine it is functioning properly.

Conditions for Running the DTC

* The ignition is OFF.
* The vehicle is in Park.

Conditions for Setting the DTC

The body control module (BCM) detects an internal failure within the content theft deterrent intrusion/inclination sensor.

Action Taken When the DTC Sets

The intrusion and inclination output is disabled.

Conditions for Clearing the DTC

* A current DTC is cleared when the conditions for setting the DTC are no longer present.
* A history DTC will clear after 40 malfunction-free ignition cycles.

Reference Information
Schematic Reference

Theft Deterrent System Schematics Theft Deterrent System Schematics
Connector End View Reference

Component Connector End Views Connector End Views By Name
Description and Operation

Theft Systems Description and Operation Theft Systems
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 Control Module References for scan tool information

Circuit/System Verification

1. Ignition ON.
2. Verify DTC B291A is not set.

• If DTC B291A is set
Replace the B67 ultrasonic intrusion sensor.

• If DTC B291A is not set

3. All OK.

Repair Instructions

Perform the Diagnostic Repair Verification Verification Tests after completing the repair.

Theft Deterrent Sensor Replacement Service and Repair