For 1990-2009 cars

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

1. Perform the Diagnostic System Check - Vehicle before using the Symptom tables in order to verify that there are no DTCs set.
2. Review the system operation in order to familiarize yourself with the system functions.

### Visual/Physical Inspection

• | Inspect for aftermarket devices which could affect the operation of the Theft Deterrent System. Refer to Checking Aftermarket Accessories .

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

• | Inspect that the transmitter is the correct model for the vehicle. An incorrect model will not operate the Theft Deterrent System.

### Intermittent

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

### Symptom List

Refer to the following list in order to diagnose the symptom:

• | Scan Tool Does Not Power Up

• | Scan Tool Does Not Communicate with CAN Device