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Yes the BMW head unit is the server for the Most Bus which can
have a number of modules besides the SOS function . All those
modules will cease to function when replaced by and aftermarket
head unit . There are some harnesses that bypass this stuff like
certain connects 2. From the old days the first thing you did when
removing and replacing the OEM with aftermarkete was code out
the SOS module from the Instrument Panel and remove the TCU
and or Mulf .
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