Getting prepared to install an X940 into a "05" ford Escape and since this is a DIY project I'm looking at everything related to the project. My unit was used so I'm uncertain about several things. One of these is that initially I'm not planning on using any other A/V source related to the auxiliary wiring harness , that being the case,  do I need it to operate the unit?  

UPDATE: OK it dawned on me that even if I don't use it for anything else, I'll need the Auxiliary Harness to do the PB Bypass.