Hab noch mal im US Forum nachgefragt im E31 Forum, die haben ja die selben Probleme und teilweise das selbe SMM Steuergeraet im E31:
FWIW, I had the steering column memory controller fail on my 850 and yes the controls were reversed along with a shorter than normal travel.
Given, they are functionally identical I anticipate the Seat/Mirror Memory Module circuitry will be nearly identical.
Been an E-Tech for 50yrs so I always open up everything and do some meter probing to see if I can determine what went wrong. Might even research the parts to see if I can determine the specific circuitry.
In my steering column controller, one of the electrolytic caps failed and caused the dual +5v regulator to not perform correctly.
Essentially, these controllers have a constant power (sleep mode) to maintain memory settings and a run power (ignition on).
That I recall, the run power was being overloaded by the failing cap and the output voltage was below spec when the ignition was turned on.
Yep, replaced the caps and all was well.
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