A Symptoms - Theft Deterrent

Important Preliminary Checks Before Starting
1. Perform Diagnostic System Check - Theft Deterrent before using the Symptom Tables in order to verify that all of the following are true: Diagnostic System Check
^ There are no DTCs set.
^ The control module(s) can communicate via the serial data link.
2. Review the vehicle theft deterrent description and operation in order to familiarize yourself with the system functions. Refer to the following:
^ Theft Systems Description and Operation
^ Vehicle Theft Deterrent (VTD) Description and Operation

Visual/physical inspection
^ Inspect for aftermarket devices which could affect the operation of the VTD system. Refer to Checking Aftermarket Accessories in Diagnostic Aids.
^ Inspect the easily accessible or visible system components for obvious damage or conditions which could cause the symptom.

Intermittent
Faulty electrical connections or wiring may be the cause of intermittent conditions. Refer to Testing for Intermittent and Poor Connections in Diagnostic Aids.

Symptom list
Refer to Security Indicator Inoperative in order to diagnose a SECURITY indicator malfunction.