NHTSA ID Number: 11024406
Manufacturer Communication Number: LI82.70-P-079903
TSB/Document Date: 2025-10-21
Summary
Complaint Noise interference occurs during hands-free phone calls. Cause The interference is due to electromagnetic compatibility (EMC) faults affecting the microphone wiring. This disrupts signal integrity and degrades voice quality. Severity may vary by vehicle configuration. Remedy A corrective measure involving modified wiring harnesses and revised microphone connections is in development. The updated solution is scheduled for release in December 2025. Once the measure is implemented, this bulletin will be updated and versioned accordingly.
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TSB/Document ID: LI82.70-P-079903
Replacement Service Bulletin Number:
MFR Communication Date: 2025-10-20
MFR Internal Campaign ID/Software Version:
Communication Type: Service Bulletin/Repair Instructions
NHTSA Components: ELECTRICAL SYSTEM
MFR Component System:
MFR Component Subsystem:
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Noise interference during use of the hands-free system
Topic number
LI82.70-P-079903
Version
1
Function group
82.70 - Telephone, Voice-control-system(VCS)
Date
10/20/25
Validity
BR465
Reason for change
Complaint
Noise interference occurs during hands-free phone calls.
Cause
The interference is due to electromagnetic compatibility (EMC) faults affecting the microphone wiring. This disrupts signal integrity and degrades voice quality. Severity may vary by vehicle configuration.
Remedy
A corrective measure involving modified wiring harnesses and revised microphone connections is in development.
The updated solution is scheduled for release in December 2025.
Once the measure is implemented, this bulletin will be updated and versioned accordingly.
Disclaimer
NOTE: The information contained in this document is intended for use by trained, professional technicians with the
knowledge to properly and safely perform diagnosis and repairs on Mercedes-Benz
vehicles, using Mercedes-Benz
approved tools and equipment. It informs service technicians about conditions that could occur in certain vehicles and
provides information that could assist in proper vehicle diagnosis, service, or repair. It does not indicate that a defect
is present in any vehicle referenced in this document nor does it imply warranty coverage. DO NOT assume that a
symptom or condition, or a described cause of a symptom or condition, affects any particular vehicle or groups of vehicles, or that a described repair applies to any particular vehicle or groups of vehicles. There can be multiple causes
resulting in the same or similar symptoms or conditions described in this document, and trained professional service
technicians must use their diagnostic skills to make evaluations on a case-by-case basis. The information contained
in this document does not guarantee warranty coverage nor does it extend the vehicle’s warranty in any way.
Symptoms
Communication/information > Entertainment > Audio/Sound > Poor audio quality
Communication/information > Communication > Mobile phone > Telephone > Poor understanding
Communication/information > Communication > Mobile phone > Telephone > Other party cannot be heard
Communication/information > Communication > Mobile phone > Telephone > Driver can be poorly/hardly heard
Communication/information > Communication > Mobile phone > Telephone > Person on other end can be poorly/hardly heard
21.10.2025 15:47
© Copyright Mercedes-Benz AG
CCUSHWA
Page 1 / 2
Operation numbers/damage codes
Op. no.
Operation text
21.10.2025 15:47
© Copyright Mercedes-Benz AG
Time
Damage
code
Note
H
8210REM
Use this damage code for warranty
claims
CCUSHWA
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