Hopefully this will Help:
Radio 12v red/white + radio harness
Radio Ground black - radio harness
Radio Ignition (GMLAN Serial Data)
Radio Illumination yellow (dimmer) + radio harness
Factory Amp Turn-on same as power antenna wire
Power Antenna white + radio harness
LF Speaker +/- tan - gray +,- radio harness or amplifier
Notes: If equipped, the amplifier is under the rear of the center console.
At the amplifier, the left subwoofer wires are dk. blue/white (+) - lt. green/black (-). The right subwoofer wires are dk. green (+) - lt. blue/black (-).
RF Speaker +/- lt. green - dk. green +,- radio harness or amplifier
LR Speaker +/- brown - yellow +,- radio harness or amplifier
RR Speaker +/- dk. blue - lt. blue +,- radio harness or amplifier