Hi All. Looking to hardwire my RD to my mirror using a mirror tap on my 2018 Q50 with homelink for garages. There are 4 wires- black, brown, red, and white. Not sure which is the hot ignition and which is the hot wire all the time. It's a lease so I don't want to cause any issues with the other functions of the mirror. Anyone familiar with this set up and if so I would appreciate any help. TIA.