I posted this Q in celica.net too -

Here's the scoop - my ex ::tried:: to hook up my amp/box to my celica (neither are blown b/c I just took them out of my old car and they worked fine). I dunno what he did/didn't do right, but the amp light does come on but NO sound comes out of the speakers, my little mode/equ button is now 10x louder than ever before and none of my heat control lights work anymore. Thats the only thing that seems to have happened. Any suggestions?

Where do you live? I know a person who does custom installations and full electrical work for installing anything on cars.

If your around the Harrisburg, PA area I could hook you up.

I live in Maryland - It'd probably take me about 1.5hrs to get there but at this point I really dont care. I'm about 2 seconds away from paying someone to come to my house to fix this mess, but if you can get me the hook up I'd appreciate it - I dont care about driving that far. Thanks!

Check all RCA connections and splitters theses wires can short and even split if they are cheap also if your amp has high pass and low pass freqs then check they are set correctly.

sounds like a blown fuse to me if the lights arent working either.