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Maneesh:
Sorry I'm late getting to you on this, pretty busy at the shop these days.
The MCS does need to have some reprogramming done. The 2002 ML's use a fiber optics system for the CD changer, prior to this it was used for the phone only. It was also a plug and play hardwired system prior to 2002 also. The MCS reprogramming involves setting up the internal configuration of the MCS so that the MCS knows what components are located on the fiber optics ring. That's about the simplest explaination I can give. However, just to answer about where/how this is done, yes, there are a couple different types of diagnosis computers that can be used, and typically the dealers are the only ones who have them, although some Mercedes-only independent shops will occasionally have them, they are very expensive to obtain and maintain (monthly updates). The diagnostic connector for the whole truck is under the dash on the drivers side, there is only this one port for the whole truck, and through this port is where the MCS diagnosis/version coding changes are made, not directly at the MCS unit, but through a communication line to this port from the MCS unit.
This is not an extremely difficult or time consuming job, I would even say that especially if you take it to the same dealer you bought the truck from, they may even be willing to do this at no charge.
Gilly
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