['63GENIII]

Well we've gone over a month without any BCM issues. It did have a PCM plug issue that kept it from starting for a while but a little cleaning of the pins worked great and the Yukon has been running ever since. That is until yesterday.

A couple of days ago, a guy asked my wife for a jump start for his El Camino. Reluctantly she agreed knowing that the electrics in this car are not that robust or tolerant of anything out of the norm. Yesterday, she texted me that all of the gauges had shut down, windows and door locks stopped working, radio is dead, door chime is not working, battery charge light on, display reads "unknown driver" heated seats are out. In short, the car runs but nothing electrical works inside.

So last night, I get the meters back out to check voltage and alternator output. 12.8 not running and 14.4 and fluctuating while idling. Thats when she told me about letting someone get a jump off of the car. Every fuse was checked last night and again this morning. All good there. I put my Amp Probe on the negative cable and I'll be damned, another 2.9 - 3.0 amp draw. It killed the battery overnight so I had to charge it again. It fired right up. Voltage is good, still no electrical power to any interior devices. I plugged my OBD scanner in as well just for kicks but it will not communicate to anything.

While I know that jump starting a car incorrectly (which is what I suspect happened) can cause a host of problems, is it possible that the BCM was smoked again in the process? Im not even sure that I know where to start. I think that Im going to just try to get the windows back up before it starts raining while I debate taking it into the dealer again.

Any starting points would be greatly appreciated.

Thanks, Chris