If its usb, its for the audio from your phone into your head unit. Look up the model number of your Kenwood, it will tell you if it has a backup camera input. Most aftermarket radios with backup camera capabilities, the input is almost always an rca jack on the back of the head unit.
EDIT:
to add to why there's probably 2 cables, one will be just just for audio playback, the other will also play audio but will add capability for updates/programming of the head unit.
EDIT:
to add to why there's probably 2 cables, one will be just just for audio playback, the other will also play audio but will add capability for updates/programming of the head unit.
