It sounds like the shop did a very sloppy install and hooked stereo into ABS power and IP power.
Have them fix it, or remove stereo, but honestly, I am not sure I would let them touch it again.
I would have them remove stereo and if problem persists, have GM fix it and let the stereo shop pay for it.
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Monday, October 19th, 2009 AT 9:40 AM