The PN# is correct for an '00 - it's called the 'Control Unit anti-drive-off feature, Central Locking, Alarm System' M535 just indicates that it's got Central Locking.
Replacement units are available, but you cannot reuse it once it's been coded to a particular car, meaning that you can't source it from a salvage yard.
My understanding is that the unit is expensive as is programming the replacement unit, IIRC some $3000+
Call a dealer to get a better idea...sorry to break the news to you.
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