i just found it

1998 Pontiac Grand Prix ItemWire colorPolarityWire LocationRadio 12vorange + radio harness Radio Ground black/white - radio harness Radio Ignition yellow +radio harness Radio Illumination gray/black + radio harness Factory Amp Turn-on pink+radio harness or amplifier Power Antenna green+ radio harness LF Speaker +/- tan - gray +,- radio harness or amp RF Speaker +/- lt. green - dk. green +,- radio harness or amp LR Speaker +/- brown - yellow +,- radio harness or amp RR Speaker +/- dk. blue - lt. blue +,- radio harness or amp