Navigation Retrofit Cost
The fiasco mentioned was (in broad and probably inaccurate outline) that MBUSA took navigation orders from '03 buyers before the system was ready, with promises that their cars would be retrofitted with navigation. When MBUSA decided that they couldn't retrofit after all, they swapped the non-nav cars for new cars that had navigation. It amounted to several hundred cars, or at any rate a lot.

As Some 2003s were NOT Pre wired for Nav...It can be done just More Labor
www.mbenznl.com S_Krabbenborg@hotmail.com
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My car is prewired because it is a late build, all I had to do is connect the MOST loop so it recognizes the DVD in the trunk. All the rest is pretty simple stuff, but you must have some car install knowledge. For non-installers, I strongly recommend MBenzNL or the dealer.
It works perfectly, my cost was less than $800 and did it myself with LOTS of patience. I still need to get the trunk side panel and the bracket, so figure about another couple of hundred.
Cheers,
Edward
The install was not too bad, importantly due to the prewiring. Total cost for my unit was about $1300 US (which includes the cost of the trunck panel)
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