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May 26, 2026 Service bulletin

Complaint After successful commissioning of the HERMES control unit (N112/9) with XENTRY Diagnosis DVD...

Mercedes-Benz technical service bulletin LI82.85-P-080507 for 2015-2026 Mercedes-Benz C300, 2010-2016, 2020-2023 Mercedes-Benz E350 and 2016-2023 Mercedes-Benz GLC 300 and others.

Bulletin number
LI82.85-P-080507
Component
Electrical system
Summary
Complaint After successful commissioning of the HERMES control unit (N112/9) with XENTRY Diagnosis DVD 03/2026, the message "SOS - service not activated" appears on the instrument cluster. In addition, the following two conditions are also met: • HERMES (N112/9) control unit: event code B15CE00 is ACTIVE and STORED (A+S) • Vehicle Documentation System: For the HERMES control unit, the EID1, EID2, ICCID, IMEI, IMSI, TELNR fields in the "Identification/Serial number" column have the value "-" Cause Still under analysis Remedy Recommission the HERMES control unit (N112/9) with XENTRY Diagnosis 03/2026 and add-on 33399 installed or carry out the procedure with a newer version of XENTRY Diagnosis: XENTRY→ "N112/9 - Control unit for telematics services (HERMES)" -> "Adaptations" -> "Control unit commissioning" -> "Commissioning of previously installed control unit"

Owners of these vehicles have filed 1,184 complaints in the electrical category.

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