Ok I bought a Pioneer Head unit and its going into a 87 Mazda B series Truck Here is the problem ....

Wiring Harnesses have -
Red - 12 volt ign
yellow -12 volt Batt
Black - ground
Blue - power Ant
blue / white - amp turn on
Black / white - amp ground
Orange - Alumination
Orange white - dimmer
Brown - Phone Mute

Head unit
REd ?
red/white - door switch
yellow/black -mute
brown - alarm out put
orange/white ??
Blue / White System remote control
Black ??

 

the colors are universal for almost all new decks...

so, basically match the colors...

and you don't need to hook up the door switch, alarm output, or cellular mute