Having trouble wiring my Pioneer deh-p5901b. Cannot find wiring diagram because I bought it used. I just matched up the color wiring and for some reason when I tried it it didn't work. It turns on and powers on but no sound to the speakers. First time trying to install a unit. I have three extra wires left. one is for the amp, power antenna, and dimmer. the hyundai didn't have the wires for it. your help is greatly appreciated. Thanks