Normally the key1 and key2 wires are for connecting the original steering wheel control based on the analog resistance signal.
About the subwoofer, you can also connect the subwoofer to one couple of our audio rca output cable, such as Rear Out L and R, Front Out L and R.
RegardsStatistics: Posted by Jammy — Wed Jul 13, 2016 6:40 am
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