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The older ML's that were hard-wired were plug and play. The fiber optics versions are not, they should be programmed. Then again your 99 E320 also should have been. They may work OK for awhile, eventually they can stop playing though. You must be lucky on the 99, usually they don't last over a week or two without stopping/locking up.
The programming needs to be done with the Mercedes scan tool (SDS)
Gilly
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