Steering Wheel Controls, SWC or Key, brown with black stripe, usually employs CAN bus.Back view, orange with white strip, works when reverse gear light is on, and it is used to turn on the back camera screen (i.e.Phone: the cable to mute when receiving a call is brown. ![]() Amplifier remote turn on: blue with white stripe.They have low electric current, which is activated when the radio is turned on. Wires with black stripes are for negative power: as GND ( black), 0V, usually connected to the vehicle's metal chassis and body. Illumination ( orange with white stripe) or dimmer, when it is night and cars lights are turned on, head unit screen illumination is dimmed.This allows the radio to retain settings (for example, stored radio stations) when the ignition is switched off. Constant ( yellow), also called BAT or Battery, provides permanent +12V power from battery.ACC ( red), supplies +12V power to car audio and other accessories, only when the car's ignition is switched on.Splicing wires used in car audio are mainly for power, ground, amplifier and antenna, speakers, phone and others. Several types of connectors for car audio systems are used.
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