Went to Best-Buy and bought a GPS Navigation, Pioneer AVIC-X930BT. I have a great dash kit, fits perfectly; only problem is my wiring. I bought the Scosche - Stereo Installation Kit for Select 2006 or Later GM LAN Vehicles model GM21SR from best buy but for some reason after connecting all wires, tried to start the unit and it wouldnt start at all. The installation kit that I bought said it works if you hear it chime at first but even then the actual unit still doesnt power up. Please if you have any ideas on how to help I would love more info. I never installed anything like this before so I will need step by step instructions. Thank you for your time.

Was a prewired relay socket included on the acc. wire?

yea on some of the scosche wire kits, the relay need to be taken out of the box and plugged in to the socket