GM Service Manual Online
For 1990-2009 cars only

Important: Review the system Description and Operation in order to familiarize yourself with the system functions. Refer to Garage Door Opener Description and Operation .

Visual/Physical Inspection

    • Turn the ignition key to the ON position and press any garage door opener (GDO) button. The LED should light when the unit has power and is functional.
    • Inspect for aftermarket devices which could affect the operation of the GDO. Refer to Checking Aftermarket Accessories in Wiring Systems.
    • 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 Conditions and Poor Connections in Wiring Systems.

Symptom List

Refer to Garage Door Opener Inoperative in order to diagnose the symptom.