Symptoms - Fixed and Moveable Windows. GMC Truck Sierra Classic

For 1990-2009 cars only

Makes 🢒 GMC_Truck 🢒 2007 🢒 Sierra Classic - 2WD 🢒 Body Systems 🢒 Fixed and Moveable Windows 🢒 Symptoms - Fixed and Moveable Windows

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 link.

Review the system operation in order to familiarize yourself with the system functions. Refer to the following system descriptions:

•	Power Windows Description and Operation

•	Rear Window Defogger Description and Operation

•	Inspect for aftermarket devices which could affect the operation of the power door lock, power window and power mirror systems. Refer to Checking Aftermarket Accessories.

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

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

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

•	Defogger Grid Lines Diagnosis

•	Rear Window Defogger Inoperative

•	Power Window Inoperative - Driver Door

•	Power Window Inoperative - Passenger Door

•	Power Window Express Down Function Inoperative

•	Power Window Lockout Function Inoperative