U can tell wiring is fucked because the Buick logo on start isn’t even centered. If a fuse or battery replacement I would just get a new head unit! Actually just installed a android 13 head unit with a huge screen and everything works perfectly!
After trying a few different things, it was a combination of two that worked. I replaced the climate control module and the heat started working again. Even the ac which has not worked in over a year now comes on. I also had to replace the radio/HVAC control bezel. Got both parts on eBay for under $100. Now all the controls work again, radio buttons, heated seats, climate control, front and rear defrosters. The dealership wanted to charge $250 just to diagnose it.
