The above instructions worked perfectly! If you have any question (like I did) regarding whether your factory alarm is the earlier unit or the later unit, here are the #'s for the earlier 3 button alarm system which was installed in e36's with production dates of 8/95 and earlier;
(as Dave noted below, there are always exceptions to the rules. Such as an earlier style alarm installed in a later production car. My car was not shipped with the alarm system, but was most likely added by the dealer as an upsell or by the request of the purchaser, as it is OEM. So your results may vary
)
the FCC ID# for the 3 button system Alarm Brain is #A269ZUA070 and the remote FCC ID# is A269ZUA071.
PM me if you have any auestions!
Good luck...