Trapper

Hi all, I have been working a problem on my niece's 2012 Journey and I am at a loss. The problem, I found, is not unique to the Journey but it shows up in many Dodge/Jeep vehicles of that era. The 4.3 touch screen is out and the heater system doesn't work (a few moments after starting the car the heater goes into high heat/fan mode). None of the heater control buttons work except for the 4-way flashers. The car was having battery issues and was jumped multiple times. On one jump (from a standalone battery jump starter) I had the negative / positive terminals mixed up. There was a little smoke coming from where I put the 'positive' to a metal piece that I was intending to ground and then quickly disconnected it. We don't actually know exactly when it started. After one of the jumps or after the booster mix-up. I found lots of information on this forum and elsewhere. Here is what I have done: - Disconnect battery for over a day - checked fuses, found none blown - checked for any ODB2 codes but nothing - tried to reset the radio - no work - tried the cd ejection thing - no work - I tested the power and ground (attached image) going into the main radio unit and they both were good. ALTHOUGH the power read hot even with car off which puzzled me but perhaps it's for the emergency flashers that run through the console. I'm not sure how the ignition turns on/off the radio then? - Finally I found a 2011 Journey at a local junk yard. I tried swapping the display with no result. I tried swapping the main radio with no result. I tried the console with the buttons and even tried the heater control module. Nothing. Then I swapped all of them together and still nothing. So, unless the system from the junkyard is also bad (unlikely but possible) the problem is elsewhere in the car. It would be wonderful if anyone has any suggestions on what else I could check or look for. Signed, Uncle Out of Options p.s. It will ultimately go to a shop but trying to see what they could check that I can't as $ is an issue as she's just starting out in life.