WIRE HARNESSES: STANDALONE CAN-BUS GUIDE
The low-beam canbus harnesses have a single input and a single output. The Bi-Xenon versions of the harnesses have two outputs: one for the ballast and one for the high beam.
The low beam canbus harnesses can be plugged in ultimately either way. If you aren't seeing proper function of the harness or any activity at all through it, you may need to flip the connector over depending on the polarity of your stock wiring.