Hey everyone... i have this big problem. since i tried to extend my hvac for a non navi tablet swap, i got no power in half of my car. hvac & radio screen doesnt work except front window defrost. clock , door lock, driver door lock & unlock button nothing works. my trip a & b restart everything i start my car. i had to extend the cable from the main harness for the hvac, tried rewire two times, does the same thing again. ordered another hvac screen with non extended hvac buttons still nothing. need your help plz!

 

Did you disconnect the battery negative prior to starting your work?

I've read and heard about people blowing their MICU when they disconnect the connectors on the factory headunit / HVAC display while removing them with the battery still connected.

Check all the fuses in the interior fuse box first, maybe a few of them are blown since your fault indications are all over the place.

Verified the correct wires were done? Didn't cross any?

Other than that I'd say it's probably the MICU in the under dash fuse box on the driver's side, only way to replace it is to replace the entire under dash fuse box and it's like $300.

I think there's some troubleshooting steps to check it in the factory service manual as well, if you have one you could try those first.

 

ive disconnected the positive :S, i did check a couple of fuses in the interior dash fuse box, none of them were blown, even checked the on under the hood. i did check 5-6 times that ive connected the proper wires, theyre all wired correctly. might be the MICU. Thank you

 

in case someone is interested... it was my backup light fuse :P lmao

 

I ran into the same issue today. I changed out my head unit but were not able to install the new head unit. After putting back the factory head unit, my dash, all windows, clock, sunroof. None of it is working. I disconnected the battery and left the car over night hopeig it will reset. Now seeing this thread, I'll double check the back up light fuse.

 

best way is with a test light, each fuses got two metal thing on top, check both... so you dont have to take each one out to see if its burned!