n2sound2

If the speed sensor data is in question simply disconnect it. The unit will operate fine without it. As far as check antenna error, it usually means exactly what it says. A bad antenna. I bet you have cut the insulation on the ant. wire somewhere or crimped by accident. Try a new antenna. If it was a problem with the nav traffic portion the message "xm updating" would constantly pop up on the screen. Hope this helps.

Will the unit eject the nav disc? If so, is it dirty? If you can eject the disc use a can of compressed air to clean out the cd/dvd mech. If you need more info on how to do this reply back.