LI82.62-P-058583 Service Bulletin/Repair Instructions

Sound system: Intermittent loss of sound after engine start

Topic number
LI82.62-P-058583
Version
2
Design group
82.62 Loudspeakers, amplifiers, antennas
Date
05-21-2014
Validity
Model 166, 231 with code 810 (Harman Kardon Logic 7

surround sound system)
Reason for change
Symptoms expanded
Reason for block
Complaint:
Intermittently no audio output, regardless of the selected audio source (radio, CD, USB) immediately after engine

start.

When the complaint is active, the COMAND Online control unit (A40/3) or Audio20 control unit (A2) can still be operated. However, when the MOST ring subscribers are selected (Media Interface, TV, DAB), the fault message "Media

Interface unavailable" or "Device unavailable" appears in the Audio/COMAND display (A40/8).

In the quick test, the fault codes "A27B: The specified and actual configurations of the MOST components are different" and/or "A22D: The automatic addressing or the programming is faulty" may be stored in the COMAND Online

control unit (A40/3) / Audio20 control unit (A2).

Note:

The complaint usually occurs in cold outside temperatures.

After bus idle (lock vehicle for approx. 5 minutes), the problem is usually rectified temporarily.
Cause:
Software release of sound system control unit (N40/3).
Remedy:
Perform software update of sound system control unit (N40/3) to software release 14/03.01 or higher.

This software release is expected to be available as of Xentry Telematics CD/DVD 03/2014 (A1668271800,

A1668271900, A1668272000) or newer.
Symptoms

Communication/information / Entertainment / Video TV/DVD / TV mode is not selectable

Communication/information / Entertainment / Video TV/DVD / Individual functions are not selectable/not available

Communication/information / Entertainment / Audio / Volume adjustment function error

Communication/information / Entertainment / Audio / Speakers emit no sound

Communication/information / Entertainment / Audio / Misfire

Communication/information / Entertainment / Video TV/DVD / TV mode function error

Communication/information / Entertainment / Digital radio/Satellite digital audio radio / Unavailable in MOST

Communication/information / Entertainment / Media interface (UMI/UCI) / Menu cannot be selected/is not available
05-21-2014 9:25 PM

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Control unit/fault code

Control unit
Fault code
Fault text
Audio - Audio or COMAND (A2 A27B

- A40/3) (HU45)
The specified and actual configurations of the MOST components

are different.
Audio - Audio or COMAND (A2 A22D

- A40/3) (HU45)
The automatic address allocation or the programming is faulty.
Work units

Op. no.
Operation text
54-0991
CONTROL UNIT: ..... INSTALL SOFTWARE (AFTER QUICK TEST)
54-0650
ON-BOARD POWER SUPPLY VOLTAGE MAINTAIN (WHEN CHECKING/ TESTING AND TROUBLESHOOTING)
54-1011
SHORT TEST PERFORM
Time
Damage

code
Note
82557 EP
Validity

Vehicle
Engine
Transmission
GL (166)
*
*
M (166)
*
*
SL (231)
*
*
Vehicle
Engine
Transmission
166.003
651.960
722.908
166.004
651.960
722.908
166.023
642.826
722.903
166.023
642.826
725.031
166.024
642.826
722.903
166.024
642.826
725.031
166.055
276.955
722.906
166.056
276.821
722.904
166.057
276.955
722.906
166.058
276.955
722.906
166.062
276.821
722.904
166.073
278.928
722.909
166.073
278.928
725.031
166.073
278.928
725.032
166.074
157.982
722.905
166.074
157.982
722.931
Full model designation breakdown
05-21-2014 9:25 PM

© Copyright Daimler AG
PLUBONS
Page 2/3
166.823
642.826
722.903
166.823
642.826
725.031
166.824
642.826
722.903
166.824
642.826
725.031
166.856
276.821
722.904
166.864
276.821
722.904
166.872
278.928
722.909
166.872
278.928
725.031
166.872
278.928
725.032
166.872
278.928
725.033
166.873
278.928
722.909
166.873
278.928
725.031
166.873
278.928
725.032
166.873
278.928
725.033
166.874
157.982
722.905
166.874
157.982
722.931
231.457
276.954
722.906
231.465
276.825
722.904
231.473
278.927
722.909
231.474
157.983
722.931
231.479
279.981
722.932
05-21-2014 9:25 PM

© Copyright Daimler AG
PLUBONS
Page 3/3

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