LI82.62-P-076176

Model series 223 with code 96B - static noise from speakers while driving
Topic number
LI82.62-P-076176
Version
1
Function group
82.62 - Loudspeakers, amplifiers, antennas
Date
4/11/23
Validity
Model series 223 with code 96B
Reason for change
Complaint
Static noises from speakers while driving (see video labeled example of noise).
Static noise is no longer present after opening a window (slightly) or when sliding sunroof is in tilt position.
Attachments
File
Description
Noise+Video+1.mp4
Example of noise
Cause
A total of 4 sensors are installed at the axle housings for the "Active driving noise compensation" function. These record driving noise and transfer them to control unit N156/1 - Active driving sound compensation (ASX7) as electrical
pulses.
The angle bracket of the sensor may come into contact with the longitudinal member of the body. As a result, unintended vibration may be transferred via the bracket to the sensor. The control unit interprets this as driving noise and tries to compensate, causing noise in the speakers.
Attachments
File
Description
RNC.PNG
Sensor Bracket
11.04.2023 16:38:17
© Copyright Mercedes-Benz AG
IKURTIS
Page 1 / 2
Remedy
Check assembly of sensors particularly, the brackets, and ensure that they do not come into contact with the body.
If this does not remedy the problem, please create a TIPS case.
NOTE: There may be no mechanical forces on the sensor as there may be a danger of damage.
Symptoms
Communication/information > Entertainment > Audio/Sound > Speakers emit interference noise
Operation numbers/damage codes
Op. no.
Operation text
11.04.2023 16:38:17
© Copyright Mercedes-Benz AG
Time
IKURTIS
Damage
code
Note
820CM
Please refer to this LI document for
warranty
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