Shown on model 246 |
N40/3 | Sound system amplifier control unit |
P82.62-3757-04
Shown on model 117.3 |
N40/3 | Sound system amplifier control unit |
P82.62-3933-04
Location
The sound system amplifier control unit on model 246, 242, 176, 156 and 117.9 is located centrally in the trunk under the cover.
In model 117.3 the sound system amplifier control unit is located in the trunk, beneath the paneling at the right side wall.
Tasks
Receive signals
Decoding signals
Supporting and amplifying signals
Send signals over direct lines
Receive signals
Direct lines
Media Oriented System Transport (MOST)
Direct lines
Power supply over circuit 31 and circuit 30g over one direct line each
Muting of the audio sources (with code 348 (Emergency call/assist system) or with code 350 (eCall Europe emergency call system))
Muting of audio sources from the HERMES control unit (N112/9) (with code 360 (HERMES UMTS) or with code 362 (HERMES LTE))
Visual and electrical wake-up
Media Oriented System Transport (MOST)
The sound system amplifier control unit is a MOST participant and receives audio signals from the following components:
Radio (A2) (except code 516 (Audio 5 USB) and except code 520 (Audio 20 USB))
COMAND controller unit (A40/3)
On model 117.3, 242, 246 as of 03.11.2014, model 156, 176 as of 01.09.2015 and model 117.9
Tuner unit (A90/4) (with CODE 537 (Digital radio (DAB)), with CODE 536 (SIRIUS satellite radio) or with CODE 865 (TV tuner))
On model 117.3, 242, 246 up to 02.11.2014, model 156, 176 up to 31.08.2015:
Digital Audio Broadcasting control unit (N87/3) (with CODE 537 (Digital radio (DAB)))
Satellite Digital Audio Radio (SDAR) control unit (N87/5) (with CODE 536 (SIRIUS satellite radio))
Media interface control unit (N125/1) (with CODE 518 (Media interface))
Decoding signals
Decoding DTCP copy-protected audio signals on basis of newest Digital Signal Processing (DSP) technology
DSP means that for the audio range, audio tracks are processed using mathematical algorithms with the objective of improving the acoustic sound characteristics.
Supporting and amplifying signals
Supporting surround sound (Logic 7)
Supporting two stereo entertainment channels and three announcement channels (e.g. for voice output of navigation instructions)
Amplifying decoded audio signals
Send signals over direct lines
Output of signal tones (BEEPs), digital multiple channel output and output of decoded, volume-adapted and amplified audio signals to the speaker system:
On vehicles with CODE B56 (Drive Kit Plus for the iPhone® 4/4S) or with CODE B62 (Drive Kit Plus for the iPhone® 5s/5c/5), the sound system amplifier control unit actuates the center instrument panel speaker (H4/27) over the Drive Kit control unit for the iPhone® (N123/7).
Function
The sound system amplifier control unit is actuated via the audio equipment. The audio equipment also provides all of the menus for user guidance.
Moreover, the following subfunctions are available:
Diagnosis
Software download
Diagnosis
The diagnosis of the sound system amplifier control unit is performed using the Keyword 2000 protocol. All other control units in MOST are therefore also diagnosed via this interface at the same time.
Software download
The update takes place via the DVD/CD drive of the audio unit using a CD or DVD.