If you decide to buy the Axxess unit - be sure to get it from JPCustoms.com (ask for Jason) - and let them know you are installing it in a GM car with XM. They will include free of charge the Bosch relay you need for the install. The instructions are were very clear on how to use the relay and what wire to go where.
I was able to install this one myself - and the last time I messed around with a car stereo was back in high school - about 15 years ago. I am as novice as one can be.
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2006 H2 SUV, Slate Blue.
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