Diagnostic Starting Point - Garage Door Opener

WARNING: This page is about a different car, the 2002 Oldsmobile Bravada, 2002 GMC Envoy XL, 2002 GMC Envoy, and 2002 Chevrolet TrailBlazer. However, it is still accessible from the selected car via links, so may be relevant.

Begin the system diagnosis by reviewing the system Description and Operation. Reviewing the Description and Operation information will help you determine the correct symptom diagnostic procedure to use when a malfunction exists. Reviewing the Description and Operation information will also help you determine if the condition described by the customer is normal operation. Verify with the customer that they attempted programming with the key in the ON position or with the vehicle running . Verify with the customer that they have attempted to program for rolling code. Verify with the customer that they have referred to the owners manual and have contacted the HomeLink toll free assistance line. Refer to Symptoms - Garage Door Opener in order to identify the correct procedure for diagnosing the system and where the procedure is located.