Horn stopped working,I can hear the relay clicking when using steering wheel button no sound, but the horn works when alarm is set off,P.S does someone know exactly were that horn relay is?.

Look at http://http://forum.planetisuzoo.com/viewtopic.php?t=6107 for info on checking your horn (there are two horns, one activated by the steering wheel button and one for the factory alarm).

Look at http://forum.planetisuzoo.com/viewtopic.php?t=5608 for info on where the horn relay is located.

I'm betting its a fuse, bad ground (it grounds through the housing, only the power wire goes to it), or the horn is shot and needs replaced.