Question about 2004 GMC Envoy
Is the LED on the right side of the mirror green or red? If it's red, or not illuminated at all, there is a problem in the onstar system that needs to be diagnosed with a scan tool. Also- that model may also still have the analog onstar system. GM had an upgrade program that ran for a few years that allowed you to upgrade your onstar to digital hardware. If you're still running the analog onstar hardware, it's not going to work. Again, going to a reputable dealer would be the best way to find out what's going on.
Posted on Oct 31, 2013
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Posted on Jan 02, 2017
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