I want to upgrade to OEM Auto HVAC and heated seats

[Aloeffler97]

If I can get a running parts list of everything I need I would like to attempt this, unless I have to change out the BCM or any other computers. I would like to stay away from having to splice into any wires aswell, so if every vehicle has the necessary harnesses as they do for most other things then that would be terrific. I want to do this on a 2005 Grand Prix GT

[Fivefingerdeathpunch]

You can wire in wire heated seat, it's been done before.

But you can't switch HVAC systems, the wiring and BCM functions are going to be different.