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Audio mode, function - GF82.85-P-2030GB

MODEL 463.306 /336 /346 up to 31.5.12 with CODE (EU1) COMAND APS except CODE (ZJ1) Japan version as of Model Year 2011 /YoM 10 

MODEL 463.202 /222 /236 /237 /270 /271 /303 /340 /341 up to 31.5.12 with CODE (EU1) COMAND APS except CODE (ZJ1) Japan version as of Model Year 2009 /YoM 08 

Shown on code (EU9) Surround sound system (harman/kardon Logic 7) 

Fig 1: Audio Mode Function Diagram
G07891420Courtesy of MERCEDES-BENZ USA

Function requirements, general 

General information on the audio mode 

The audio mode consists of the following subfunctions, which can be activated via the "Audio" menu item:

Further subfunctions are described in separate documents:

Operating instructions 

Audio functions are operated using the following components:

Function sequence for radio mode (AM/FM) 

The function sequence for radio mode is divided into the following subfunctions:

Function sequence for radio mode (AM/FM) (without code (ZU8) USA version) 

The amplifier module 1, window antenna and amplifier module 3, window antenna (except model 463.202/303/ 306) or radio and cell phone antenna (A28) (in model 463.202/ 303/306) receive high frequency (HF) signals for the radio frequency bands FM and AM (MW, LW, SW).

The following useful signals relevant for the radio reception are modulated onto these HF signals:

The signals are then transmitted via coaxial cables (FM, AM) directly (except model 463.202/303/306) or via the radio and cell phone antenna splitter (A28/1) and the HF switch antenna splitter (A28/7) (in model 463.202/303/306) to the tuners integrated into the COMAND operating, display and controller unit, where they are demodulated and undergo final amplification.

The demodulated audio signals in vehicles with code (EU9) Surround sound system (harman/kardon Logic 7) are routed by the COMAND operating, display and controller unit via MOST to the sound system amplifier, where they undergo final amplification.

The audio is then output by the following speakers via direct lines:

On vehicles without code (EU9) Surround sound system (harman/ kardon Logic 7), the audio signals are output by the COMAND operating, display and controller unit via direct lines by the following speakers:

Function sequence for radio mode (AM/FM/WB) (with code (ZU8) USA version) 

The amplifier module 1, window antenna and the amplifier module 3, window antenna receive high frequency (HF) signals for the radio frequency bands FM and AM (MW, LW, SW).

The following useful signals relevant for the radio reception are modulated onto these HF signals:

The signals are then sent via the coaxial lines (FM, AM) to the tuners integrated into the COMAND operating, display and controller unit, where they are demodulated and undergo final amplification. The demodulated audio signals in vehicles with code (EU9) Surround sound system (harman/kardon Logic 7) are routed by the COMAND operating, display and controller unit via MOST to the sound system amplifier, where they undergo final amplification.

The audio is then output by the following speakers via direct lines:

On vehicles without code (EU9) Surround sound system (harman/ kardon Logic 7), the audio signals are output by the COMAND operating, display and controller unit via direct lines by the following speakers:

AM tuner function sequence (MW/LW/SW) 

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

FM tuner function sequence with phase diversity (FM/WB/ TMC) 

For the FM radio frequency band, the useful signals are broadcast using frequency modulation (FM). The FM tuner integrated into the COMAND operating, display and controller unit demodulates these signals. In other words, it also separates the useful signals (audible frequencies) from the carrier signal (inaudible). The COMAND operating, display and controller unit also switches between the antenna amplifiers, depending on the reception quality.

Function requirements for "Radio Broadcast Data System" (with code (ZU8) USA version) or radio data system (without code (ZU8) USA version) 

Function sequence for "Radio Broadcast Data System" (with code (ZU8) USA version) or RDS (without code (ZU8) USA version) 

In addition to the normal radio program, many radio stations (ultra short wave) broadcast additional digital information such as station name, program type (PTY) (e.g. pop, culture) and traffic program identification (without code (ZU8) USA version). This information is evaluated by the COMAND operating, display and controller unit and appears on the display of the COMAND operating, display and controller unit:

Disk function sequence 

The disc function sequence comprises the following subfunctions:

DVD, CD or MP3 function sequence 

Integrated into the COMAND operating, display and controller unit is a 6-disk DVD changer with a single slot. The audio CDs or DVDs (including in MP3 format) are read in via the 6-disk DVD changer and processed internally by the COMAND operating, display and controller unit. The user interface for controlling the disk functions (e.g. track selection) and for displaying supplemental information (e.g. track) is provided on the display of the COMAND operating, display and controller unit.

The audio signals in vehicles with code (EU9) Surround sound system (harman/kardon Logic 7) are routed by the COMAND operating, display and controller unit via MOST to the sound system amplifier, where they undergo final amplification.

The audio is then output by the sound system amplifier over the following speakers via direct lines:

On vehicles without code (EU9) Surround sound system (harman/ kardon Logic 7), the audio signals are output by the COMAND operating, display and controller unit via direct lines by the following speakers:

AUX function sequence 

If an external device (e.g. MP3 player) is connected via the AUX jack and the "AUX" menu item is called up, the base screen is displayed. Only two speaker symbols are shown in the display. Selection or settings via function bar:

IMPORTANT The menu navigation and display of the connection options are shown on the display of the COMAND operating, display and controller unit and are dependent on the particular portable terminal that is connected.

The audio signals in vehicles with code (EU9) Surround sound system (harman/kardon Logic 7) are routed by the COMAND operating, display and controller unit via MOST to the sound system amplifier, where they undergo final amplification.

The audio is then output by the sound system amplifier over the following speakers via direct lines:

On vehicles without code (EU9) Surround sound system (harman/ kardon Logic 7), the audio signals are output by the COMAND operating, display and controller unit via direct lines by the following speakers:

Memory card function sequence 

If a memory card (Secure Digital (SD) card) is inserted into the SD slot of the COMAND operating, display and controller unit and the "Memory card" menu item is called up, the base screen is displayed.

The following appears on the display:

The audio signals in vehicles with code (EU9) Surround sound system (harman/kardon Logic 7) are routed by the COMAND operating, display and controller unit via MOST to the sound system amplifier, where they undergo final amplification.

The audio is then output by the sound system amplifier over the following speakers via direct lines:

On vehicles without code (EU9) Surround sound system (harman/ kardon Logic 7), the audio signals are output by the COMAND operating, display and controller unit via direct lines by the following speakers:

Function sequence for Music Register 

Files (in MP3 format) from the DVD or CD via the 6-disk DVD changer of the COMAND operating, display and controller unit as well as from the memory card (SD card) via the SD slot of the COMAND operating, display and controller unit can be stored on the integrated hard disk of the COMAND operating, display and controller unit and then called up as desired. If the "Music Register" menu item is called up the basic screen appears. The following appears on the display:

The audio signals in vehicles with code (EU9) Surround sound system (harman/kardon Logic 7) are routed by the COMAND operating, display and controller unit via MOST to the sound system amplifier, where they undergo final amplification.

The audio is then output by the sound system amplifier over the following speakers via direct lines:

On vehicles without code (EU9) Surround sound system (harman/ kardon Logic 7), the audio signals are output by the COMAND operating, display and controller unit via direct lines by the following speakers:

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