PUMA as of Dec 2020 for the failing H/K system with bass / sound drops. This is translated from German. A Service Bulletin should be making its way soon to the U.S. This affects a lot of models.
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The PUMA measure for this is: DE 65463809-01 - 17.11.20
Only vehicles with the following special equipment (SA) are affected: ...
F40, F44, F90, G01, G02, G08, G20, G21, G22, G28, G29, G30, G31, G32, G38,
With the two special equipment (optional extra):
SA 6U3 BMW LIVE COCKPIT PROFESSIONAL
AND
S-0688 HARMAN / KARDON SURROUND SOUND SYSTEM
A diagnosis must be carried out in the event of a customer complaint.
If the fault memory entry in control unit RAM01:
B7F480 - Booster no connection
is present and no other cause can be found:
(For example loudspeaker noises or background noises originating from the end device ), the control device is:
Replace amplifier Top-Hifi-System with the following part number:
65 12 5 A38 AB8 amplifier top hi-fi system
!Important:!
The change index must be checked before installing the part number.
The new spare part must have the change index AI-02 or higher.
Only with these can it be excluded that the customer complaint will recur.
!Info:!
The control unit amplifier Top-Hifi-System 65 12 5 A38 AB8 with AI-02 is
expected to be available from December / 2020.
Only applies to vehicles with the production period: from March 1st, 2020 to November 1st, 2020
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Here is the part, make sure the revision index is AI-02 or higher if your service center is ordering:
https://www.getbmwparts.com/oem-part...22-65125a38ab8