B291B
DTC B291B
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 Descriptors
DTC B291B 00
- Content Theft Deterrent Sensor Malfunction
DTC B291B 39
- Content Theft Deterrent Sensor Internal Malfunction
DTC B291B 42
- Content Theft Deterrent Sensor Calibration Not Programmed
Circuit/System Description
The content theft deterrent intrusion/inclination sensor is a multifunction sensor which detects motion inside the vehicle (intrusion), as well as change in the vehicle level (inclination). The intrusion/inclination sensor is supplied power and ground for operation and communicates with the body control module (BCM) via a dedicated serial data circuit. The sensor may be turned on or off using the disable switch and will display its status through the status LED.
Conditions for Running the DTC
* The ignition is OFF.
* The vehicle is in Park.
Conditions for Setting the DTC
The BCM detects a malfunction 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 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 B291B 39 or B291B 42 is not set.
• If DTC B291B 39 or B291B 42 is set
1. Program the K9 body control module.
2. Operate the vehicle within the Conditions for Running the DTC.
3. Verify the DTC does not set.
• If the DTC sets, replace the B67 ultrasonic intrusion sensor.
• If the DTC does not set
4. All OK.
• If DTC B291B 39 or B291B 42 is not set
3. Refer to Circuit/System Testing.
Circuit/System Testing
1. Ignition OFF and all vehicle systems OFF, disconnect the harness connector at the S43 ultrasonic intrusion sensor disable switch. It may take up to 2 minutes for all vehicle systems to power down.
2. Test for less than 10 ohm between the ground circuit terminal 2 and ground.
• If 10 ohm or greater
1. Ignition OFF.
2. Test for less than 2 ohm in the ground circuit end to end.
• If 2 ohm or greater, repair the open/high resistance in the circuit.
• If less than 2 ohm, repair the open/high resistance in the ground connection.
• If less than 10 ohm
3. Ignition OFF, connect the harness connector at the S43 ultrasonic intrusion sensor disable switch. Disconnect the harness connector at the B67 ultrasonic intrusion sensor.
4. Test for less than 10 ohm between the ground circuit terminal 5 and ground.
• If 10 ohm or greater
1. Ignition OFF.
2. Test for less than 2 ohm in the ground circuit end to end.
• If 2 ohm or greater, repair the open/high resistance in the circuit.
• If less than 2 ohm, repair the open/high resistance in the ground connection.
• If less than 10 ohm
5. Ignition ON.
6. Verify a test lamp illuminates between the B+ circuit terminal 3 and ground.
• If the test lamp does not illuminate and the circuit fuse is good
1. Ignition OFF.
2. Test for less than 2 ohm in the B+ circuit end to end.
• If 2 ohm or greater, repair the open/high resistance in the circuit.
• If less than 2 ohm, verify the fuse is not open and there is voltage at the fuse.
• If the test lamp does not illuminate and the circuit fuse is open
1. Ignition OFF.
2. Test for infinite resistance between the B+ circuit and ground.
• If less than infinite resistance, repair the short to ground on the circuit.
• If the test lamp illuminates
7. Test for less than 1 V between the signal circuit terminal 1 and ground.
• If 1 V or greater
Repair the short to voltage on the circuit.
• If less than 1 V
8. Ignition OFF.
9. Test for infinite resistance between the signal circuit terminal 1 and ground.
• If less than infinite resistance
1. Ignition OFF, disconnect the harness connector at the S43 ultrasonic intrusion sensor disable switch.
2. Test for infinite resistance between the signal circuit and ground.
• If less than infinite resistance, repair the short to ground on the circuit.
• If infinite resistance, test or replace the S43 ultrasonic intrusion sensor disable switch.
• If infinite resistance
10. Test for less than 10 ohm between the signal circuit terminal 1 and ground with the S43 ultrasonic intrusion sensor disable switch closed.
1. Ignition OFF, disconnect the harness connector at the S43 ultrasonic intrusion sensor disable switch.
2. Test for less than 2 ohm in the B+ circuit end to end.
• If 2 ohm or greater, repair the open/high resistance in the circuit.
• If less than 2 ohm, test or replace the S43 ultrasonic intrusion sensor disable switch.
11. Ignition ON.
12. Verify the content theft disable indicator is not illuminated.
• If the content theft disable indicator is illuminated
Repair the short to voltage on the circuit.
• If the content theft disable indicator is not illuminated
13. Install a 3 A fused jumper wire between the control circuit terminal 2 and B+.
14. Verify the content theft disable indicator is illuminated.
• If the content theft disable indicator is not illuminated
1. Ignition OFF, disconnect the harness connector at the S43 ultrasonic intrusion sensor disable switch.
2. Test for infinite resistance between the signal circuit and ground.
• If less than infinite resistance, repair the short to ground on the circuit.
• If infinite resistance.
3. Test for less than 2 ohm in the signal circuit end to end.
• If 2 ohm or greater, repair the open/high resistance in the circuit.
• If less than 2 ohm, test or replace the S43 ultrasonic intrusion sensor disable switch.
• If the content theft disable indicator is illuminated
15. Ignition OFF, disconnect the X6 harness connector at the K9 body control module, ignition ON.
16. Test for less than 1 V between the serial data circuit terminal 16 and ground.
• If 1 V or greater
Repair the short to voltage in the circuit.
• If less than 1 V
17. Ignition OFF.
18. Test for infinite resistance between the serial data circuit terminal 16 and ground.
• If less than infinite resistance
Repair the short to ground in the circuit.
• If infinite resistance
19. Test for less than 2 ohm between the serial data circuit terminal 16 at the K9 body control module harness connector X6 and the serial data circuit terminal 4 at the B67 ultrasonic intrusion sensor harness connector.
• If 2 ohm or greater
Repair the open/high resistance in the circuit.
• If less than 2 ohm
20. Replace the B67 ultrasonic intrusion sensor.
21. Verify DTC B291B is not set.
• If DTC B291B is set
Replace the K9 body control module.
• If DTC B291B is not set
22. All OK.
Repair Instructions
Perform the Diagnostic Repair Verification Verification Tests after completing the repair.
* Theft Deterrent Sensor Replacement Service and Repair
* Control Module References Control Module References for BCM replacement, setup, and programming