Hello All. I hope somebody can help me. I have a 2015 Astra J 2.0 cdti  Elight with a Navi 650. I have fitted a Xbox unit & reversing camera that is working great. Now I am fitting a four antenna DVB-T2 unit but I have lost the fitting instructions. I can remember most of the connections but am stuck on three wires. Purple TX. Green RX. and White IR. I seem to remember one or two wires connected to the handbrake circuit but not sure which ones. Thanks. best regards.  kipper