Right on MUD- all that info is much appreciated!
Now I have to make some sense out of all of it.
RE: the TSB.... In all my Google searching and result reading I did come across the going off automatically after being turned on. Those problems seem to have been narrowed down to the MCM under the seat, and the actual element itself shorting out.
The only problem solver I've been able to find for the on / off ghost is the door module, which is connected to the bottom of the window switches in an 03 Yukon.
http://www.fixya.com/cars/t1790846-0...lution-heading
A side from that it's a bunch of 'what I do I do' without a bunch of 'this is what you do' when it comes to auto on/off issues.
I really want to avoid the dealer. I think an acquaintance has a body code reader, but it's not a tech 2. That should work, no?
OH- and RE: the actual switch on the door. That little SOB, when turning on a seat heater at will, will really test a man's anger management issues. I was ready to rip the wires right off that damn circuit board and the only reason I didn't is because I was afraid the heater would still come on leaving me really ****ed.
Anyways, it is removed from the door at this time. I too thought it could be a switch problem because when things go haywire the input of the seat heater BACK button doesn't always register, or is delayed. Once you remove the plastic cosmetic buttons you'll find little low profile rubber buttons attached to the circuit board. I don't think there's a spring behind that. I think it is just the rubber molded the way it is that causes the button to auto return from depress. From what I can see there is nothing wrong visually with the circuit board the switches are attached to.