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 Instructions) provides 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

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 Relearning) for scan tool information

Circuit/System Testing

1. Ignition OFF, disconnect the harness connector at the P4 security siren.
2. Test for less than 10ohm between the ground circuit terminal 4 and ground.

• If greater than the specified range, test the ground circuit for an open/high resistance.

3. Ignition ON, verify a test lamp illuminates between the B+ circuit terminal 2 and ground.

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

4. Disconnect the X6 harness connector at the K9 BCM.
5. Test for less than 1V between the serial data circuit terminal 9 and ground.

• If greater than the specified range, test the serial data circuit for a short to voltage.

6. Ignition OFF, test for infinite resistance between the serial data circuit terminal 9 and ground.

• If not the specified value, test the serial data circuit for a short to ground.

7. Test for less than 2ohm 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 greater than the specified range, test the serial data circuit for an open/high resistance.

8. If all circuits test normal, replace the P4 security siren.

Repair Instructions

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

Control Module References (Programming and Relearning) for BCM replacement, setup, and programming