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Mercedes-Benz S-Class Active Multi-contour Seat, Code 432, Function not available

Mercedes-Benz S-Class Active Multi-contour Seat, Code 432, Function not available

2024年 6月 21日
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Complaint: Active Multi-contour Seat function not available.

The fault memory contains the fault “B1EA904 – Multi-contour seat pneumatic pump has malfunction. Internal fault.”

The pneumatic pump can only be activated again by deleting the fault entry.

Cause: The malfunction of the pneumatic pump is due to temporary icing due to large temperature fluctuations.

Remedy:

  • Never replace the pneumatic pump!
  • The pneumatic pump control unit (M40/1) is equipped with the latest software.

Notes on the new software:

  • In the event of temporary icing, a fault is again recorded in the control unit M40/1 and the pneumatic pump remains locked in the current ignition sequence.
  • The next time the ignition switch is switched on, the pump restarts and the pneumatic multi-contour function is available again.

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