Alarm Malfunction

Theft Deterrent Alarm Malfunction

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 Instructionsprovides an overview of each diagnostic category.

Circuit/System Description

The content theft deterrent system uses the security siren as an audible alert device to alert individuals near the vehicle that a vehicle intrusion is occurring. The security is supplied power and ground for operation and communicates with the body control module (BCM) via a dedicated LAN circuit.

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 Referencesfor scan tool information

Circuit/System Testing

1. Ignition OFF and all vehicle systems OFF, disconnect the harness connector at the P4 security siren. 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 4 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 ON.
4. Verify a test lamp illuminates between the B+ circuit terminal 2 and ground.

• If the test lamp does not illuminate

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 infinite resistance.

3. 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 illuminates

5. Ignition OFF, disconnect the X6 harness connector at the K9 BCM, ignition ON.
6. Test for less than 1 V between the serial data circuit terminal 9 and ground.

• If 1 V or greater
Repair the short to voltage in the circuit.

• If less than 1 V

7. Ignition OFF.
8. Test for infinite resistance between the serial data circuit terminal 9 and ground.

• If less than infinite resistance
Repair the short to ground in the circuit.

• If infinite resistance

9. Test for less than 2 ohm between the serial data circuit terminal 9 at the K9 BCM harness connector X6 and the serial data circuit terminal 3 at the P4 security siren harness connector.

• If 2 ohm or greater
Repair the open/high resistance in the circuit.

• If less than 2 ohm

10. Replace the P4 security siren.

Repair Instructions

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

Control Module References Control Module Referencesfor BCM replacement, setup, and programming