Wires are either standard color coded or labeled for a simplified installation: Wire Color / Function Red: +12 Volt Accessory (There are 2 of these wires) Yellow: +12 Volt Constant Black: Chassis Ground (for Subaru only) Blue: Amp Turn-On Orange: Illumination 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 -
Ground Wire Note: The ground wire found in the wiring harness is only for select vehicles only. Confirm that your vehicle's wiring harness has a corresponding ground wire. If no wire is present, connect the ground wire of your aftermarket head unit to the vehicle's metal chassis.