2002 GMC Envoy Car Stereo Wiring Chart - ModifiedLife Whether your an expert GMC Envoy mobile electronics installer, GMC Envoy fanatic, or a novice GMC Envoy enthusiast with a 2002 GMC Envoy, a car stereo wiring diagram can save yourself a lot of time. Automotive wiring in a 2002 GMC Envoy vehicles are becoming increasing more difficult to identify due to the installation of Read More Read More 2002 GMC Envoy | Stereo Wiring Diagram 2002 GMC Envoy. April 13th, 2014 Posted in GMC Envoy. 2002 GMC Envoy Stereo Wiring Information. Radio Battery Constant 12v+ Wire: Orange The stereo wiring diagram listed above is provided “as is” without any kind of warranty. Use of the information above is at your own risk. SOLVED: Need wiring diagram for Gmc envoy stereo - Fixya need wiring diagram for Gmc envoy stereo I've conncected a new radio, but there's a seperate small harness with 5 - GMC 2006 Envoy question. Search Fixya. Browse Categories 2002 GMC Envoy Car Stereo Wiring Chart Car Radio Battery Constant 12v+ Wire: Orange 2002-2003 Gmc Envoy Vehicle Wiring Chart and Diagram Listed below is the vehicle specific wiring diagram for your car alarm, remote starter or keyless entry installation into your 2002-2003 Gmc Envoy. This information outlines the wires location, color and polarity to help you identify the proper connection spots in the vehicle.