i just did this in my vy calais. the CAT10F unit has a pinout system inside it where you put these little clips on different number for different combinations of car and brand of system. very simple. then there are a few wires - blue brown green black and red. Red to Acc, Black to Earth, Brown to vehicle brown, blue to antenna, and green is not used. Also, i had to earth out the black with yellow trace on the vehicle. The install is very straight forward and the instructions come with it. also i had to mount the IR sender, i tucked it along the roof lining and put it near the rear passenger vanity light. This isnt the best because when i have a passenger their head blocks the signal so im going to move it somewhere low near the handbrake. hope this helps. I paid $188 for the unit from JB but that was cost price.