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There were some tranitsional years
There were some transitional years
where the 5 series and the 3 series systems where not
the same I believe . The 5 series had a distributed system
where some of the channel were in the Head Unit .
When people try to program options that were not in there
car that year the production date has to be maniputlated for
the programming to take.
But if the wiring is not correct for that option that has to be
taken care of to.
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