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(Audio Mode, Function - GF82.85-P-2030GR)

MODEL 166 up to model year 2016 

G14136929Courtesy of MERCEDES-BENZ USA

Function requirements, audio mode, general 

General information on the audio mode 

The audio mode consists of the following component functions:

IMPORTANT In vehicles with CODE 518 (Media Interface), additional audio mode functions are available that are described in the "Media Interface, function" document.

IMPORTANT Audio mode functions are selected using the following controls:

On vehicles except CODE 810 (Sound system) and CODE 811 (Advanced sound system), the audio equipment outputs the audio signals via the vehicle's speaker system.

On vehicles with CODE 810 (Sound system) or CODE 811 (Advanced sound system), the audio equipment forwards the audio signals via MOST to the sound system amplifier control unit, which actuates the speaker system.

In vehicles with CODE 811 (Advanced sound system), the sound system amplifier control unit does not actuate some of the speakers directly, but via the bass speaker amplifier.

On vehicles with CODE 867 (SPLITVIEW), the audio equipment forwards the audio signals via the integrated Kleer® radio interface to the radio frequency headphones or via a direct line to the headphones electrical connector (cabled).

IMPORTANT More detailed information on the speaker system is available in the Speaker output function documentation.

Function sequence for volume/tone settings 

All volume and tone settings are performed using the audio equipment. This is performed either by the user or automatically by the audio unit.

The volume and tone settings are shown on the Audio/COMAND display. The sound settings can be changed with "Tone" and the system returned to the default settings in the system settings menu. On vehicles with CODE 810 (Sound system) or CODE 811 (Advanced sound system), in addition to the general sound settings (treble, bass and balance) the audio equipment has the additional Logic7 (surround sound) or Surround Sound (Bang & Olufsen) sound setting.

IMPORTANT The tone settings can be carried out separately for each audio source. The volume can be adjusted separately for the traffic information service and navigation announcements.

IMPORTANT With the AUX audio source (via the Media Interface adapter cable (with CODE 518 (Media Interface))) or via the AUX connection electrical connector (except CODE 518 (Media Interface), up to 13.12.2013) it is possible to select "Standard" or "Boost effect" in the "Volume" menu. The input level can be increased by selecting "Boost effect".

The audio signals are output via the speaker system.

The volume and tone setting partial function is subdivided into the following subfunctions:

Function sequence for manual volume/sound settings 

The manual volume/tone setting function is subdivided into the following subfunctions:

IMPORTANT On vehicles with CODE 810 (Sound system) or CODE 811 (Advanced sound system), the desired settings are forwarded via MOST to the sound system amplifier control unit where they are processed. On vehicles except CODE 810 (Sound system) or CODE 811 (Advanced sound system), the selected settings are processed internally. Audio emitted over the speaker system is interrupted by actuating the Mute button (S111s6) or using the corresponding key on the audio equipment.

Function sequence for volume settings via right multifunction steering wheel button group 

Pressing the + and - button for setting specific functions and volume control (S111s1) enables the volume for audio and video source to be increased or reduced.

Function sequence for volume settings through the audio equipment 

Operating the control on the audio equipment increases or reduces the volume.

Function sequence for sound settings via audio/COMAND control panel 

The user can set the corresponding sound by selecting the "Sound" menu on the audio/COMAND control panel.

The Audio/COMAND control panel control signals are transmitted via the telematics CAN to the audio equipment.

Function sequence for tone settings via remote control (as of 15.07.2013 with CODE 867 (SPLITVIEW)) 

By pressing the + and - button, the volume for the audio or video sources is raised or lowered. The user can make the corresponding tone settings by selecting the "Sound" menu via the remote control. The control signals from the remote control are forwarded via infrared directly to the COMAND controller unit and processed there.

The control signals are forwarded to the audio equipment via the following route:

Function sequence for speed-dependent volume control (SDV [GAL]) 

The volume is adapted to the noise level in the vehicle interior using the speed-dependent volume control, which is defined by the vehicle speed.

In order to make this adjustment, the instrument cluster transmits vehicle speed information to the audio equipment via the interior CAN. In vehicles with CODE 810 (Sound system) or CODE 811 (Advanced sound system), the audio equipment forwards the information via MOST to the sound system amplifier control unit.

In accordance with this information the audio equipment or the sound system amplifier control unit raises the output level or lowers it.

On vehicles with CODE 811 (Advanced sound system), the SDV is additionally optimized by using the sound system microphone. The sound system amplifier control unit reads in the signals of the sound system microphone, evaluates the signals, and adjusts the volume of the audio signals to the interior or driving noises.

Function sequence for radio mode (FM/AM) 

The antennas receive signals for the frequency bands FM (ultra-short wave) and AM (medium wave) and - not for all national versions - short wave (SW), long wave (LW)). The following useful signals relevant for the radio reception are modulated onto these signals:

The FM-1 signals are received via direct lines from the audio equipment via the following route:

The FM-2 signals are received via direct lines from the audio equipment via the following route:

The AM signals are received via direct lines from the audio equipment via the following route:

The radio mode function sequence consists of the following subfunctions:

Function sequence for AM tuner (MW, LW, SW) 

For the MW and LW radio frequency bands, the useful signals are broadcast using amplitude modulation (AM). The AM tuner integrated into the audio equipment demodulates these signals. In other words, it separates the useful signals (audible frequencies) from the carrier signal (inaudible).

IMPORTANT In vehicles with CODE 498 (Japan version) or CODE 494 (USA version), only MW frequencies can be received in the AM frequency range.

Function sequence for FM twin tuner with multipath reception (FM), except CODE 498 (Japan version) 

For the FM radio frequency band, the useful signals are broadcast using frequency modulation (FM).

The dual FM tuner integrated into the audio equipment demodulates these signals. In other words, it separates the useful signals (audible frequencies) from the carrier signal (inaudible). The audio unit also enables a reception-specific switchover between the FM 1, AM, CL and KEYLESS-GO antenna amplifier and the FM 2, DAB and TV 1 antenna amplifier.

Function sequence for FM twin tuner with multipath reception (FM), with CODE 498 (Japan version) 

The double FM tuner integrated into the audio equipment separates the audio signals (audible frequencies) from the carrier signal (not audible).

The FM 1, AM, CL and Keyless-Go antenna amplifier is used for Vehicle Information and Communication System (VICS) signals (traffic messages) and the FM 2, DAB and TV 1 antenna amplifier is used for FM radio signals. Reception-dependent changeovers do not take place.

Function sequence for Radio Broadcast Data System (RDBS) (with CODE 494 (USA version)) or RDS (except CODE 494 (USA version), except CODE 498 (Japan version)) 

In addition to the radio program, many radio stations (FM) also broadcast additional digital information such as station name and traffic message channel recognition.

The additional digital information is evaluated by the audio equipment and shown on the Audio/COMAND display, provided that the following preconditions are complied with:

Function sequence for digital radio (DAB) (with CODE 537 (Digital radio)) 

The Digital Audio Broadcasting control unit allows reception of digital radio in the DAB format. The stations are categorized into groups in DAB, so-called "Ensembles".

Control of the DAB functions is accomplished via the audio equipment. The information or displays required for control are shown on the Audio/COMAND display.

The Digital Audio Broadcasting control unit receives the DAB signals as DAB band-III signals via direct lines as follows:

The DAB signals are transmitted and made available by the audio unit via MOST. The audio equipment transmits the FM station lists to the Digital Audio Broadcasting control unit. If a comparable FM station is found, it is requested by the Digital Audio Broadcasting control unit. If the DAB reception worsens, a switch is made to the audio unit's FM station, whereby the Digital Audio Broadcasting control unit adjusts the time lag between the digital and the analog signal. In this way the switchover is almost inaudible ("Seamless Linking").

DAB dual tuner 

The Digital Audio Broadcasting control unit is designed as a dual tuner and provides not only the known functions but also the following optimizations and extensions:

Function sequence for Satellite Digital Audio Radio (satellite radio) (SDAR) (with CODE 536 (SIRIUS satellite radio)) 

The satellite digital audio radio (SDAR) control unit permits the reception of stations from the provider "Sirius satellite radio". The SDAR system is controlled through the audio equipment and the control occurs over MOST. The information or displays required for control are output via the Audio/COMAND display and also in the instrument cluster.

The Sirius satellite radio signal is broadcast 3 times to achieve a diversity of channels (using two satellites and one terrestrial transmitter).

The multifunction antenna receives all three channels of the Sirius satellite radio (Sat 1, Sat 2, terrestrial stations) and transmits these signals via a direct line to the satellite digital audio radio (SDAR) control unit.

The satellite digital audio radio (SDAR) control unit receives and decodes the signals and transmits them via MOST to the audio unit.

IMPORTANT Real-time traffic data (RTTD) is also transmitted via SDAR, which includes accident and congestion reports and traffic flow information. In vehicles with CODE 512 (COMAND APS with DVD changer) this data is made available to the navigation module of the COMAND controller unit via MOST.

Function sequence for connections in stowage compartment (telephone compartment) between the front seats 

External devices (e.g. Walkman, USB stick) can be connected to the AUX connection electrical connector (except CODE 518 (Media interface), up to 13.12.2013) and the USB electrical connector.

The electrical connectors are connected to the audio equipment via direct line. If the "AUX" or "USB storage" menu is activated, the audio equipment outputs the audio data of the connected devices via the speaker system or forwards it via the MOST to the sound system amplifier control unit (with CODE 810 (Sound system) or CODE 811 (Advanced sound system)).

In the "USB storage" menu, user guidance is provided via the Audio/COMAND display. The audio equipment generates the display information and transmits it to the Audio/COMAND display via an LVDS line.

The "Aux" menu is operated from the external device (except the volume and tone settings).

IMPORTANT In vehicles with CODE 518 (Media Interface), the Media Interface electrical connector is installed instead of the AUX connection electrical connector (installed up to 13.12.2013). AUX devices can be connected to the Media Interface electrical connector via the relevant adapter cable. The media interface function is described in a separate document.

Function sequence for DVD/CD audio 

The DVD/CD audio and video function can be used to play back audio CDs or audio DVDs (including MP3 format).

User guidance for controlling DVD/CD functionality and displaying supplemental information is carried out via the Audio/COMAND display. The data exchange between the audio equipment and the Audio/COMAND display takes place via the telematics CAN, but the audio equipment transmits image and video data to the Audio/COMAND display via an LVDS line.

Function sequence for Music Register (with CODE 512 (COMAND APS with DVD changer) or with CODE 527 (COMAND APS with single DVD drive (with navigation))) 

Files in MP3 format on a CD/DVD, USB memory stick or Secure Digital (SD) card can be stored on the hard disk integrated in the audio equipment and then retrieved as required.

IMPORTANT In vehicles with CODE 498 (Japan version) MP3 files may not be copied to the Music Register due to legal specifications. Instead of this, in the "Disc" menu one can use "REC" to store music tracks from an audio CD as MP3 file on the COMAND controller unit's hard disk ("rip"). The MP3 files in the Music Register are not imported in this instance, but generated by the audio equipment itself.

Function sequence for Bluetooth® audio 

The Bluetooth® antenna allows the audio equipment to receive Bluetooth® audio signals from external devices. Bluetooth® audio is divided into the following subfunctions:

Search for devices and authorization 

The same options exist for the authorization of a Bluetooth® audio source as are available for telephony:

The device lists are set up the same for Bluetooth® audio and telephony. In the respective list, only those devices that support the corresponding Bluetooth® profile of the respective function are found or displayed during a search.

With Bluetooth® audio these are Audio Video Remote Control Profiles (AVRCP) and Advanced Audio Distribution Profiles (A2DP), and for telephony it is the Hands-free Profile (HFP). If a device supports both functions, it is shown in both lists following authorization.

Connection and reconnection 

An authorized device can be connected by means of selection in the corresponding list. If a device is connected that supports both HFP and AVRCP/A2DP, all profiles are connected. In this case the device is a telephone and the source of Bluetooth® audio at the same time. On most devices, it is necessary to start the player on the telephone so that it can then be controlled via the audio equipment.

When starting, the audio equipment proceeds with the following strategy: First a check is performed as to whether an authorized telephone is inserted into the mobile phone cradle (with CODE 386 (Comfort telephony)). If this is the case, the audio equipment connects to the telephone and goes into the comfort telephony status. If no mobile phone cradle is present or no telephone inserted, the audio equipment searches for the last two telephones. If one of these devices is found, the audio equipment connects to this device. If this device also supports AVRCP/A2DP, these profiles are also connected.

If a device is connected that only supports HFP and a change to the Bluetooth® audio application is made, "No Bluetooth audio device connected" is shown on the audio equipment if corresponding audio sources are shown in the device list.

The "Connect last device" function bar enables the last used Bluetooth® audio source to be connected. However, the connection to the current telephone is interrupted here.

If a device is connected that only supports AVRCP/A2DP and a change to the telephone application is then made, the connection to the device is disconnected and the audio equipment begins the search for the last two telephones.

Metadata and display of information 

The display of information for Bluetooth® audio depends on the respective device used. If this device supports AVRCP 1.0, only "Audio streaming" is shown on the Audio/COMAND display and in the instrument cluster.

As of AVRCP 1.3, the track, album and artist are shown. In addition, the currently played time of the track can also be conveyed. Furthermore, there is the option of changing between the normal track sequence and shuffle.

IMPORTANT It is possible to jump to the next or the previous track using the left multifunction steering wheel button group.

IMPORTANT Notes on supported devices for Bluetooth® audio can be found under:

www.mercedes-benz.com

Function sequence for audio output via headphones (with CODE 867 (SPLITVIEW)) 

Equipment with CODE 867 (SPLITVIEW) enables the driver and the front passenger to use the entertainment and communication systems integrated into the vehicle, including the display on the Audio/COMAND display at the same time and independent of each other. The audio mode functions can be called up via the remote control. The COMAND controller unit receives the signals from the remote control via the integrated infrared interface. In order to enable undisturbed concentration on the traffic situation for the driver, the front passenger receives the audio signals via headphones. The COMAND controller unit transmits the audio signals via an integrated Kleer® radio interface to the radio frequency headphones. As an option, external cabled headphones can also be used. The cabled headphones receive the audio signals from the COMAND controller unit via the headphones (cabled) electrical connector.

  Electrical function schematic for Digital Audio Broadcasting function   PE82.60-P-2057-97NAA
  Electrical function diagram for audio mode, function   PE82.60-P-2058-97NAA
  Electrical function schematic for SDAR function   PE82.60-P-2060-97NAA
  Overview of system components, telematics   GF82.85-P-9999GR 
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