Diagnostic Fault Information
| • | 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. |
Diagnostic Fault Information
Circuit | Short to Ground | Open/High Resistance | Short to Voltage | Signal Performance |
|---|---|---|---|---|
B+ | 1 | 1 | -- | -- |
Shock Sensor Signal | 1 | 1 | 1 | -- |
Ground | -- | 1 | -- | -- |
1. Shock Sensor Malfunction | ||||
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
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
Without Accessory Inclination Sensor
- Ignition OFF, disconnect the harness connector at the shock sensor.
- Ignition ON, verify a test lamp illuminates between the B+ circuit terminal A and ground.
- Test for B+ between the signal circuit terminal B and ground.
- Ignition OFF, connect the harness connector at the shock sensor. Disconnect the X7 harness connector at the BCM.
- Ignition ON, test for B+ between the signal circuit terminal 15 and ground.
- If all circuits test normal, test or replace the shock sensor.
| ⇒ | If the test lamp does not illuminate, test the B+ circuit for a short to ground or an open/high resistance. |
| ⇒ | 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. |
| ⇒ | 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. |
With Accessory Inclination Sensor
- Ignition OFF, disconnect the harness connector at the shock sensor and the harness connector at the inclination sensor.
- Ignition ON, verify a test lamp illuminates between the shock sensor B+ circuit terminal A and ground.
- Test for B+ between the signal circuit terminal B and ground.
- Ignition OFF, connect the harness connector at the shock sensor. Disconnect the X7 harness connector at the BCM.
- Ignition ON, test for B+ between the BCM signal circuit terminal 15 and ground.
- Ignition OFF, connect the harness connector at the inclination sensor.
- Ignition ON, test for B+ between the BCM signal circuit terminal 15 and ground.
- If all circuits test normal, test or replace the shock sensor.
| ⇒ | If the test lamp does not illuminate, test the B+ circuit for a short to ground or an open/high resistance. |
| ⇒ | 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. |
| ⇒ | 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. |
| ⇒ | If not the specified value, test or replace the inclination sensor. |
Repair Instructions
Perform the Diagnostic Repair Verification after completing the diagnostic procedure.
Control Module References for BCM replacement, setup, and programming
