My hubby was changing the radio in our 2010 Mazda 3 and it blew a fuse and suddenly our ac, our info panel, and the cigarette lighter stopped working. He replaced the fuse, and the lighter, the info panel, they started to work again, but here's where it gets weird. The hazard lights only work now if the car is running. Same for the door locks. The AC is blowing hot (when it was ice cold just before that) and the radio won't come on at all. The interior lights won't come on either. We swapped the fuse relay under the hood with the horn relay and the horn worked, so it isn't that. We're just extremely confused. Is there a fuse we're missing? Anyone have ideas?

 

Have you gone thru and tested all the fuses in the interior fuse box as well as the engine bay fuse box?

 

We did! And in doing so, we found the 15A ROOM fuse in the engine bay fuse box was blown. Once we replaced that, EVERYTHING started working again and our cold cold AC is back! We checked that the other day too but missed that it blew I guess lol