- Symptoms

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: Diagnostic System Check - Door Systems
^ There are no DTCs set.
^ The control module(s) can communicate via the serial data link.

2. Review the system description and operation in order to familiarize yourself with the system functions. Refer to:
^ Power Windows Description and Operation
^ Power Door Locks Description and Operation
^ Outside Mirror Description and Operation (Power Mirrors) or Outside Mirror Description and Operation (Heated Mirrors) or Outside Mirror Description and Operation (Automatic Day -- Night Mirrors)

VISUAL/PHYSICAL INSPECTION
^ Inspect for aftermarket devices which could affect the operation of the power door lock, power window and mirror systems. Refer to Checking Aftermarket Accessories in Diagrams.
^ 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 Diagrams.

SYMPTOM LIST
Refer to a symptom diagnostic procedure from the following list in order to diagnose the symptom:
^ Power Windows Inoperative - Express Down Function
^ Power Windows Inoperative - Lockout Function
^ Power Window Inoperative - Driver Door
^ Power Window Inoperative - Passenger Door
^ Power Door Locks Inoperative - All Doors and Switches
^ Power Door Locks Inoperative - One Door or Switch
^ Power Door Lock inoperative - Driver Door
^ Power Door Locks - Lock Inoperative Unlock Operates
^ Power Door Locks - Unlock Inoperative Lock Operates
^ Automatic Door Locks Inoperative (Manual Transmission)
^ Power Mirrors Inoperative (except Escalade)
^ Mirrors - Outside Automatic Day-Night Feature Inoperative
^ Heated Mirrors Inoperative