tonykast

Hello i have a 2004 rx300 with the 6cd mark levinson stereo, im changing the unit to and im struggling to find a wiring diagram, also ive disconnected the old one and now the display unit for the reversing camera, air con, trip info and all the settings do not work, ive found a 2 wire cable which goes to the display connected to the back of the stereo and im wondering what the wires do, are they just for power, my new unit has both sat nav and camera but it i wont have all of the other functions. Thanks for any help you can offer Tony