Sorry But if plug into the OBD II data port and change some thing, you could mess up the ECM or PCM ( ENGINE CONTROL MODULE or POWER CONTROL MODULE ) In some cases it controls your transmission (Automatic only ) Then you would have to have it reflashed. Or if you short it out you would have to replace it. They run sometimes up too and over a THOUSAND DOLLARS. I know I sell them to people all the time who mess with things they should not. I do not think Pionner would want to pay for that. I charge $70. just to flash your ECM and if you have an import you might have to take it to the Dealer and they will charge you big buck's ! So be careful if you mess with your ECM. P.S. Flash software only works on a PC not a MAC.

its already done

http://www.pcmag.com/slideshow_viewer/0 ... D40,00.asp

None of this is new GM has had driver infomation center for years. Plus don't foget your ECM can have Pass-Lock I or pass Lock II. If you mess that up you would need to do the relearn so your car will start. this takes someone that knows what they are doing. Not the average Joe. Thanks for that address but I'll stay with my AVIC as my chevy already has as a factory option. If you have a lower end car the Garmin is a good way to go.

2005 Chevy with every option

Guys again, this is off topic, let's get back on topic before I start deleting post.