i drive a 2000 nissan maxima with B.o.s.e (buy other stereo equipment)factory system installed. about six months ago i replaced my bose head unit with a clarion cz500. everything worked fine up until i decided to install a different head unit( pioneer 980-bt ) i remove the harness to wire it with my new hu then when i put it in the car and i turn it up..... no sound but subs in the back ground...i attempted to install my clarion back in still no sound from the speakers with the clarion either. i checked my radio and speaker fuses they are ok. and checked my harness adapter. the speakers connect via rcas on the adapter so i know everything was connected. any ideas about what happen?? plz plz help!!!!!!!!!!! riding with just bass is ok but gets old really quick.