The Locked Stick Post didn't cover what I was looking for, maybe I didn't explain it right. Let me try again. I have a Bypass Module I didn't actually see it but I was told it was a box you connect to your unit (Z1) and you will be able to drive and watch DVD's and all your Navi functions will work while your drive, which is true I can do all of this. Now I have upgraded to the Z3 HDD and now this box (Bypass Module) doesn't work, when I took it back to the installer he said it only works on the Z1. So I was trying to find out if anyone was using this box and got it to work on the Z3 and if so