3 year old post...
This was what I ended up using , works awesome .. 2 hour install .
Rear Camera Kit - Car Kit Company
There is a simple test to see if it will work with your Sat/Nav head unit
With Radio off
Press and hold the “Settings” button and turn the volume control counter clockwise.
After about 40 clicks a menu will appear
Select “confirmation/adjustment”
Next move down to “Camera” and select
Then select “Camera Syst Type” and change from “No Camera” to “With Rear view Camera”
Come all the way out of the menus using the back button and the system will reboot
Now when you put the car in reverse, if a blue screen appears with “Please check your surroundings” message your car is compatible