Thread: Stereo installation in a 2003 GTP

Now, I know there are lots of posts about installing stereos in the '97 - '03 GPs, BUT.... there is so much confusion, I would like to attempt to get all the info into one thread. So, I am throwing out this question to those that have installed stereos in these vehicles. The variables about this install are: 1) WITHOUT OnStar or Bose, 2) WITHOUT OnStar, but With Bose 3 WITH OnStar and Bose, what is needed in way of wiring harnesses AND brackets. I have read that all that is needed is a simple plug with bare wires, or a wiring harness adapter kit. I have heard double dins need a bracket, and I have heard double dins need a "homemade" remedy. I have seen double dins that just fit behind the bezel and use a few pieces of plastic to fill the voids, and I have seen double dins that infringe on the heater controls below. So, what I am asking, is please post your installs, listing what you used and did to install your radio (as in what wiring did you need?). I am not so much concerned what your radio does, just what size (single or double din) If single din, was it a video unit, and did the video display go above or below the radio? Thanks to all who can help out.

So nobody has successfully installed a double din in their 2003ish Grand Prix? Someone has to of done this. Still wondering what harnesses you need to get this all done. I know about the steering wheel control harness, but am still confused if I need a simple wire harness to connect the head unit up to my Bose amp, or if I need one of the harnesses that has a module in it??

Cut and fit. I have one in my car right now. I can snag you a pic in 15 if ya like

Originally Posted by Bluemagic

Looks not bad, but did you need a simple adapter that just plugged into the stock vehicle wiring and then soldered the wire connections to your deck, or did you need one of the special adaptors with a module in it? Also, did your car have the Bose system in it?