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May 20, 2026 Service bulletin

Complaint • Driver's seat and/or front passenger seat cannot be adjusted

Mercedes-Benz technical service bulletin LI91.16-P-073576 for 2021, 2023 Mercedes-Benz S 580, 2022-2026 Mercedes-Benz S 580 4matic and 2022-2026 Mercedes-Benz S 500 4matic and others.

Bulletin number
LI91.16-P-073576
Component
Seats
Summary
Complaint • Driver's seat and/or front passenger seat cannot be adjusted. • Not possible to adjust front seats to memory preset. • Head restraints of front seats cannot be adjusted. • Cannot move to chauffeur mode/reclining seat position. Fault identification: → Create log of seat control unit (both conditions must be met) 1. Fault B1F7E54 "Head restraint inclination adjustment not normalized. No calibration." stored in fault memory. 2. Value "0C" present in seat control unit log service 0X220239 (see attachment "seat control unit log"). If fault B1FBB15 "Malfunction in 'Head restraint inclination' switch. There is a short circuit to positive or an open circuit." is also stored in the fault memory, the cause might also be due to the wiring or terminal contacts. Cause Faulty head restraints Remedy Replace the affected head restraint

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