Originally Posted by bullet4

i dont advise doing this. your car is under warranty let the dealer fix it. most likely it needs a new nav/audio unit. ive seen a few of these recently due to faulty cradles in the dvd unit for the nav disc. the disc wobbles in the cradle and scratches the disc.

as for the self diag mode i dont know if any of you know this but you can do irrepairable damage by clicking a couple different things in the nav diag mode. and a disc read error wont be detected by the self diag anyway. that mode is more for us to diag controller and button problems and to check to make sure gps antennas are working and to install newer software