My nav system will all of a sudden just stop and eject or say the Nav disc needs to be changed, I remove the disc and put it back in and it will just spit it out. Other times will work fine! Any ideas?

 

My best guess is that the laser is dirty, the disc is dirty, or the disc is damaged.

 

Anyone know how you clean the laser?

 

there are cds that clean the laser

 

Can you put in another cd in the Nav and see if it's just the cd?

 

Just be sure it's another nav CD and not a music CD when you check.

 

When I put in another section cd it just tells me to change cd's. I purchased a cleaning Cd but can't tell if it's running or not, or how long it should stay in as it tells me to change the cd within a few seconds. this said other times the Nav system works perfectly.

 

You may need to re-flash your COMAND firmware. Your dealer can do it. In any case, this will require diagnostics that your dealer or a good independent MB tech will have to address.