Shock Sensor Inoperative

Shock Sensor Inoperative

Diagnostic Fault Information

* 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 Instructionsprovides an overview of each diagnostic category.

Diagnostic Fault Information






Circuit/System Description

The shock sensor is a component of the content theft deterrent (CTD) system which monitors the vehicle for shock impacts. The shock sensor provides an alarm signal to the body control module (BCM) in the event that the vehicle is being tampered with. The sensor ground is controlled through a switched ground from the BCM. By providing ground from the BCM the sensor is powered-up and activated.

Diagnostic Aids

The shock sensor is a dealer installed accessory. Not all vehicles are equipped with an inclination sensor. To determine if a particular vehicle is equipped with an inclination sensor, visually inspect the installation location for the sensor based on the information contain in the installation instructions.

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

Content Theft Deterrent (CTD) Description and Operation Content Theft Deterrent (CTD)
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 Relearningfor scan tool information

Circuit/System Testing

Without Accessory Inclination Sensor
1. Ignition OFF, disconnect the harness connector at the shock sensor.
2. Ignition ON, verify a test lamp illuminates between the B+ circuit terminal A and ground.

• If the test lamp does not illuminate, test the B+ circuit for a short to ground or an open/high resistance.

3. Test for B+ between the signal circuit terminal B and ground.

• If not the specified value, test the signal circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the BCM.

4. Ignition OFF, connect the harness connector at the shock sensor. Disconnect the X7 harness connector at the BCM.
5. Ignition ON, test for B+ between the signal circuit terminal 15 and ground.

• If not the specified value, test the signal circuit for a short to ground or and open/high resistance. If the circuit tests normal, replace the shock sensor.

6. If all circuits test normal, test or replace the shock sensor.

With Accessory Inclination Sensor
1. Ignition OFF, disconnect the harness connector at the shock sensor and the harness connector at the inclination sensor.
2. Ignition ON, verify a test lamp illuminates between the shock sensor B+ circuit terminal A and ground.

• If the test lamp does not illuminate, test the B+ circuit for a short to ground or an open/high resistance.

3. Test for B+ between the signal circuit terminal B and ground.

• If not the specified value, test the signal circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the BCM.

4. Ignition OFF, connect the harness connector at the shock sensor. Disconnect the X7 harness connector at the BCM.
5. Ignition ON, test for B+ between the BCM signal circuit terminal 15 and ground.

• If not the specified value, test the signal circuit for a short to ground or and open/high resistance. If the circuit tests normal, test or replace the shock sensor.

6. Ignition OFF, connect the harness connector at the inclination sensor.
7. Ignition ON, test for B+ between the BCM signal circuit terminal 15 and ground.

• If not the specified value, test or replace the inclination sensor.

8. If all circuits test normal, test or replace the shock sensor.

Repair Instructions

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

Control Module References Programming and Relearningfor BCM replacement, setup, and programming