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

1. Perform the Diagnostic System Check - Door Systems 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 system operation in order to familiarize yourself with the system functions.

•	Refer to Power Door Locks Operation .

•	Refer to Outside Mirrors Operation .

•	Refer to Power Windows Operation .

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