It can be done, I bought a Nismo without Bose & had the dealer throw in the 790$ mirror, you tap the orange wire @ the fuse panel (details on Nissan tech net) to power the harness that powers the camera, signal is provided through the harness, (I have a 940bt pioneer & made the harness ,tapping the wires out of the harness that came with the mirror) into a RCA & have camera out of hu & mirror. Details, I'll get you the link
