For 1990-2009 cars

Important: The following steps must be completed before using the symptom tables.

1. Perform the Diagnostic System Check - Theft Deterrent before using the Symptom Tables in order to verify that all of the following are true:

• | There are no DTCs set.

• | The control module(s) can communicate via the serial data link.

2. Review the theft systems description and operation in order to familiarize yourself with the system functions. Refer to the following:

• | Theft Systems Description and Operation

• | Content Theft Deterrent (CTD) Description and Operation

• | Vehicle Theft Deterrent (VTD) Description and Operation

### Visual/Physical Inspection

• | Inspect for aftermarket accessories which could affect the operation of the theft system. Refer to Checking Aftermarket Accessories in Wiring Systems.

• | Inspect the easily accessible or visible system components for obvious damage or conditions which could cause the symptom.

• | Inspect the ignition key for "PK3" stamped on the shank.

• | Inspect the PASS-Key III® key head for damage.

### Intermittent

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

### Symptom List

Refer to a symptom diagnostic procedure from the following list in order to diagnose the symptom:

• | Content Theft Deterrent (CTD) Alarm Mode Inoperative

• | Content Theft Deterrent (CTD) Does Not Disarm with Key Lock

• | Horn Inoperative in Content Theft Deterrent (CTD) Alarm Mode

• | Lights Inoperative in Content Theft Deterrent (CTD) Alarm Mode

• | Security Indicator Inoperative