Help with my 2001 sebring lxi please

My cousin was installing a deck in my car and he touched two speaker wires together. now my keyless entry, radio, dome lights wil not work. i cant even put the factory alarm on. i checked all the fuses and they were good. so what can it be and how do i fix it. please help

It probably just shorted the circut out...Did you seperate the wires after that? If you did, than you should have no problem after that if the fuses are fine. If not, take the head unit out again, and make sure there are no exposed wires touching any metal pieces etc. tape up all the wires...make sure everything is connected properly...That sort of thing. Good luck, let me know how it goes