Anyone have steering wheel control diagram? Need to wire pac switch for radio controls and I don't know what wires to use.

2003 Land Rover Discovery II

 

Yep, you will use the white wire on your pac unit, and connect it to the grey/red on your rover. I had the Becker traffic pro unit stock in my 03, so my grey red wire was connected to the module just behind the heater control panel, below the actual radio.
Then you will want to connect the grey/black to ground.
Thats what I did with mine and it works perfect!
-Nick