Security Indicator Malfunction

Security Indicator Malfunction

Diagnostic Instructions

* Perform the Diagnostic System Check - Vehicle (Initial Inspection and Diagnostic Overview) prior to using this diagnostic procedure.
* Review Strategy Based Diagnosis (Initial Inspection and Diagnostic Overview) for an overview of the diagnostic approach.
* Diagnostic Procedure Instructions (Initial Inspection and Diagnostic Overview) provides an overview of each diagnostic category.



Diagnostic Fault Information






Circuit/System Description

The security indicator is controlled by the body control module (BCM) based on commands from the immobilizer system or the content theft deterrent (CTD) system. With the ignition OFF, the security indicator is commanded by the CTD system. With the ignition ON, the security indicator is commanded by the immobilizer system.


The security indicator is located on the upper instrument panel. When the immobilizer or CTD system requests the indicator be commanded ON, the BCM applies B+ to the security indicator control circuit, illuminating the indicator.


Reference Information
Schematic Reference

Theft Deterrent System Schematics (Theft Deterrent System Diagrams)
Connector End View Reference

Component Connector End Views (Connector Views)
Description and Operation

Content Theft Deterrent (CTD) Description and Operation (Content Theft Deterrent (CTD) Description and Operation)
Electrical Information Reference

* Circuit Testing (Component Tests and General Diagnostics)
* Connector Repairs (Component Tests and General Diagnostics)
* Testing for Intermittent Conditions and Poor Connections (Component Tests and General Diagnostics)
* Wiring Repairs (Component Tests and General Diagnostics)

Scan Tool Reference

Control Module References (Programming and Relearning) for Scan Tool Information


Circuit/System Verification

Ignition ON, command the security indicator ON and OFF with a scan tool. The security indicator should turn ON and OFF when changing between the commanded states.


Circuit/System Testing

1. Ignition OFF, disconnect the harness connector at the theft LED.
2. Test for less than 10 ohms of resistance between the ground circuit terminal A and ground.

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

3. Connect a test lamp between the signal circuit terminal B and ground.
4. Ignition ON, command the security indicator ON and OFF with a scan tool. The test lamp should turn ON and OFF when changing between the commanded states.

• If the test lamp is always ON, test the control circuit for a short to voltage. If the circuit tests normal, replace the BCM.
• If the test lamp is always OFF, test the control circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the BCM.

5. If all circuits test normal, replace the theft LED.



Repair Instructions

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

* LED Indicator Replacement - Vehicle Security System (Removal and Replacement)
* Control Module References (Programming and Relearning) for BCM replacement, setup, and programming