For 1990-2009 cars only
Diagnostic Instructions
| • | Perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure. |
| • | Review Strategy Based Diagnosis for an overview of the diagnostic approach. |
| • | Diagnostic Procedure Instructions provides an overview of each diagnostic category. |
DTC Descriptors
DTC B291B 00: Content Theft Deterrent Sensor MalfunctionDTC B291B 39: Content Theft Deterrent Sensor Internal Malfunction
DTC B291B 42: Content Theft Deterrent Sensor Calibration Not Programmed
Circuit/System Description
This diagnostic applies to internal microprocessor integrity conditions within the content theft sensor (intrusion/inclination sensor).
Conditions for Running the DTC
| • | The ignition is OFF. |
| • | The vehicle is in Park. |
Conditions for Setting the DTC
The body control module detects an internal failure within the content theft 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
Connector End View Reference
Description and Operation
Content Theft Deterrent (CTD) Description and Operation
Electrical Information Reference
Scan Tool Reference
Control Module References for scan tool information
Circuit/System Testing
1. Verify that DTC B291B is not set.
| ⇒ | If the DTC is set, program the B79 content theft deterrent sensor. If the DTC resets, replace the B79 content theft deterrent sensor. |
Repair Instructions
Perform the Diagnostic Repair Verification after completing the diagnostic procedure.
Control Module References for body control module replacement, setup, and programming.
