I know it is the Vehicle Speed Sensor, but I am wonder what all does it do? Is is just to provide a speed reading for the dynamic guages in the nav system? Does it have anything to do with preventing you from watching a DVD in motion like the bypass allows?

Methinks you forgot to search first!

http://www.avic411.com/forum/viewtopic.php?t=11510

http://www.avic411.com/forum/viewtopic.php?t=10859

http://www.avic411.com/forum/viewtopic.php?t=7599

http://avic411.com/forum/viewtopic.php?t=6011

http://www.avic411.com/forum/viewtopic.php?t=2222

http://www.avic411.com/forum/viewtopic.php?t=1084

answered several times at that. locked.