Symptoms - Immobilizer

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

Perform the Diagnostic System Check - Vehicle before using the symptom tables in order to verify that all of the following are true:

•

There are no DTCs set.

•

The control modules can communicate via the serial data links.

Review the system operation in order to familiarize yourself with the system functions. Refer to Immobilizer Description and Operation .

Visual/Physical Inspection

•

Inspect for aftermarket devices which could affect the operation of the systems. Refer to Checking Aftermarket Accessories .

•

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

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 OnStar Stolen Vehicle Slowdown Active in order to diagnose the symptom.