Thanks for all your info. Why does GM (in other cars thankfully) run so many things through the HU. I doesn't make any sense to me.

Hello out there. Newbie here. I just got my 2005 Vibe with 25000 kms on it (LOVE IT!!!) and I would like to upgrade the stock head unit. I went to my local stereo shop and the sales guy said I might have a problem with an aftermarket deck working in conjunction with my air bags, door chimes and seat...