Hi,

this is a knowing problem.
I don't know witch software version you got, but the solution is:


Start your car, and let the car running.

Do a downgrade from your Navigation software, it doesn't mather witch version, say the V22.

After that you put the NAV DVD back and test the system.

If everything is oke than you take take the V26 and do a software upgrade.
After that you put the NAV DVD back and test the system.

If everything is working well you close the car. Open the trunk and lock your car. After a few minutes the light on the MK4 has to go out.

And your Nav computer is oke again.

greets Appy