I need some help on the install of my amp on a 99 es300. I have a stock radio and i am trying to put in some bang i hooked up everything right and its still not working amp cuts on and everything. Is there an extra factory amp im suppose to uninstall?? I got a converter/step down kinda thing hooked up to the rear driver side door right now i had it hooked up to the rear sub but it didnt help?? THANKS FOR ANY HELP GUYS!!!!!!!