I'm working on installing a CarPC and relocating the stock LCD displays for the A/C and radio. I bought another whole console unit with displays so I don't mess up the current one in the car.

I've run into a problem and can't figure out how to fix. Last night I disconnected the A/c controls from the car and plugged into my project board with LCDs to test. All worked well, but when plugging stock back in now the A/C, heat goes on full blast, the LCD displays don't light up, the outside temp doesn't read, the keyfob doesn't lock or unlock...

I've tried unplugging the battery and plugging back in, but no luck. I've read a couple other people on here have run into the issue, but I haven't found a solution. Any ideas/suggestions? Maybe I accidentally shorted, so would the fuse go out? Does anyone know the fuse that controls all the stuff? Thanks in advance!

 

check all the fuses. Inspect them each fuse carefully. Happened to me.

 

Thank you very much for the reply!!! It ended up being the number 7 fuse labeled backup. It was blown so replaced with another of the same 7.5 amps and I'm good to go now. Glad it was easy!