Here is Alpine's wiring info:

Black: Ground
Yellow : 12v+ Constant
Red: 12v+ Switched
Blue: Electric Antenna Trigger
Blue/White: 12v+ Remote Trigger
Orange: Illumination
Orange/White: Dimmer
Brown: Mute
White: Left Front Speaker +
White/Black: Left Front Speaker -
Gray: Right Front Speaker +
Gray/Black: Right Front Speaker -
Green: Left Rear Speaker +
Green/Black: Left Rear Speaker -
Violet: Right Rear Speaker +
Violet/Black: Right Rear Speaker -