Hey I am in the process of installing a Pioneer avic-z2. I have found the wiring harness needed but I don't know where to locate the vss wire and back up wire for are cars. I have the premium package and someone on nasioc was saying it may be in the oem harness to the 6 disk changer. can anyone confirm this or no where I can locate them. Also Will i need to wire the parking brake wire? ??? ???