How many discs do you have?
One for ALL of the USA? Or 11 for USA and Canada?
What is the zone number on your disc? What is the date on your disc?
2000 to 2002 were CD-Rom navs. 2003 and up are DVD navs.
No way could a 'factory installed' DVD nav unit come standard in a 2001.
Actually, a 2001 could not have come with a DVD NAV either as a factory or
dealer option. The DVD NAV was not introduced until sometime late in 2002
and was available in the 2003 model. However, because it is backward
compatible with any model year MCS, it could have (and must have) been added
later in the vehicle's life. It is possible that the original owner bought
the DVD NAV unit and added it himself, but the D2B system on the ML
generally requires dealer "coding" of any new peripherals. Of course it is
also possible that the owner slipped a mechanics a few $$ to do this, but
otherwise, there should be a record of this service visit.
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