JoeyF

Hi just wondering if someone here can help me out. I have a 2007 Nissan skyline v36 sedan. My radio and air con have stopped working, car runs fine though. I've tried swapping the relays (small blue plugs) but none of them seem to be doing the trick. Is there a particular way of doing this or would there be something wrong with the relays? Any help would be great thanks.

How do you know which relay to use?