Replied to your post on NASIOC also.
VSS: Two places, depending on how you want to run your wire.
1. Cruise control module, above driver's side kick panel, pin 19, Green/Yellow.
2. ECU, facing the side with the connectors, it is the far right connector, pin 1 (far right top wire), Green/Yellow.
I chose the ECU because it was easier to get the wire over to the nav unit.
Reverse: Behind passenger side kick panel, in the rearward harness, Light Brown/Yellow.
I didn't hook the reverse up because I didn't know where it was at the time. The AVIC-D3 works fine without it, unless