I also have a 2010 Edge limited that has the nav screen. Installed a camera that works (Tested with a separate monitor) but we can't get the system to turn on the function. Dealer said no, can't, won.t, no...... I'm pretty sure that it is possible. Have the video interface that goes directly into the nav unit. Thru forscan, I changed what I thought would be the change (APIM 7D01-01 X*XX-XXX-XXX Changed the astrix to a 2, and an a. Both did nothing. Please help.....