What is SWC in car stereo?
Car Audio Interface SWC Retention Steering Wheel Control Module.
What is key1 and key2 wires for?
The Key 1, Key 2, and Key GND wires will be used to interface steering wheel controls if your vehicle came equipped. Most newer vehicles will also need the Axxess ASWC-1 to translate the steering wheel controls to this stereo.
Do I need to hook up power antenna wire?
Yes, these two wires should be connected together. This is what allows the radio to retract the antenna when it isn’t being used. Just because your wiring harness has a connection for this wire, it doesn’t necessarily mean that your car has this kind of motorized antenna.