I'm working on my after market stereo and amp. I want to remove the seat and console and start the car. What, if any, problems will I run into having the HVAC, F55, seat heater harness/switches disconnected?

 

You may get a code / error without the traction control button plugged into the harness. What are your intentions with starting the car? Just radio install? Without the seat, does not sound like you intend to drive. You'll be fine.

 

I'm chasing down engine noise in my stereo system. It's in the RCAs. I want to reroute the wires and start it up to check. Will the error code clear itself once I connected back?

 

Starting the car without the seats plugged in will turn the airbag light on. Just means the computer cant make the airbags fire. I have both my seat harnesses and seat airbag harnesses disconnected when I go to the track. I cant say for the console but id imagine the traction control/suspension system would be in-op until the console is re-installed.