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Home >> Mercedes Benz >> 2009 >> E 350 Sedan (211.056) V6-3.5L (272.964) >> Repair and Diagnosis >> Accessories and Optional Equipment >> Radio, Stereo, and Compact Disc >> Description and Operation >> GF82.85-P-2030TXC Audio Mode, Function

GF82.85-P-2030TXC Audio Mode, Function



GF82.85-P-2030TXC Audio Mode, Function
- with CODE (512) COMAND APS with DVD changer
- with CODE (528) COMAND with DVD changer


General information
The audio mode is made up of the following functions which can be activated using the Audio menu item:
^ Radio mode (ultra-short wave (FM), medium wave (MW), long wave (LW), short wave band (SW))
^ Media player (Compact Disk (CD), Digital Versatile Disk (DVD), Secure Digital (SD) card)
^ Music Register (hard disk)

Further functions are described in separate documents:
^ Digital Audio Broadcasting (DAB) function, with code 537 Digital radio and with code 833 Great Britain version
^ SDAR control unit (N87/5), with code 536 SIRIUS satellite radio and code 494, USA version

Operating instructions
Audio functions are operated using the following components:
^ Left multifunction steering wheel button group (S110)
^ Right multifunction steering wheel button group (S111)
^ Control panels of the COMAND operating, display and controller unit (A40/3)
^ Voice control system

Function requirements
^ Status "Circuit 30 ON"
^ The COMAND operating, display and controller unit works correctly
^ No fault in antenna system (radio function)
^ The medium to be played is available and correct

Function sequence for radio mode (amplitude modulation (AM) / frequency modulation (FM)), in general
The function sequence is subdivided into the following subfunctions:
^ Function sequence for radio mode (AM/FM), except code (494) USA version
^ Function sequence for radio mode (AM/FM), with code (494) USA version
^ AM tuner function sequence (MW/LW/SW)
^ FM tuner function sequence with phase diversity (PFM/ Weather band (WB)/Traffic Message Channel (TMC))
^ Radio Broadcast Data System (RBDS) or Radio Data System (RDS) function sequence

Function sequence for radio mode (AM/FM), except code (494) USA version
The radio antennas receive the radio frequency (RF) signals for the AM and FM radio frequency bands. The following useful signals relevant for the radio reception are modulated onto these HF signals:
- Music signals
- Speech signals
- Data signals (e.g. TMC messages (traffic information))

The high frequency signals are routed via direct lines to the corresponding antenna amplifier. These antenna amplifiers filter the frequencies of the radio frequency bands out of the received HF signals and amplify them. The amplified signals are then sent over coaxial lines (FM, AM) to the tuner integrated into the COMAND operating, display and controller unit where they are demodulated.
The demodulated audio signals in vehicles with code (810) Sound system are routed from the COMAND operating, display and controller unit via the Media Oriented System Transport (MOST) to the sound system amplifier (N40/3) where they undergo final amplification. The audio is then output by the following speakers via direct lines:
- Left front door speaker group (H4/1)
- Right front door speaker group (H4/2)
- Left rear door speaker group (H4/3)
- Right rear door speaker group (H4/4)
- Bass box speaker (H4/17)
- Center cockpit speaker (centerfill) (H4/27)
- Left rear surround speaker (H4/54)
- Right rear surround speaker (H4/57)

The audio signal for the bass box speaker travels from the COMAND operating, display and controller unit via MOST to the amplifier for sound system and from there, over direct lines via the subwoofer amplifier (N40/9) to the bass box speaker.

For vehicles except code 810 Sound system, the audio signals undergo final amplification by the COMAND operating, display and controller unit and are then output over the following speakers via a direct line:
- Left front door speaker group
- Right front door speaker group
- Left rear door speaker group
- Right rear door speaker group
- Center cockpit speaker (centerfill)

Function sequence for radio mode (AM/FM), with code (494) USA version
The radio antennas receive the radio frequency (RF) signals for the AM and FM radio frequency bands. The following useful signals relevant for the radio reception are modulated onto these HF signals:
- Music signals
- Speech signals
- Data signals (e.g. weatherband (WB) messages (Weather information))

The high frequency signals are routed via direct lines to the corresponding antenna amplifier. These antenna amplifiers filter the frequencies of the radio frequency bands out of the received HF signals and amplify them. The amplified signals are then sent over coaxial lines (FM, AM) to the tuner integrated into the COMAND operating, display and controller unit where they are demodulated.

The demodulated audio signals in vehicles with code 810 Sound system are routed from the COMAND operating, display and controller unit via the Media Oriented System Transport (MOST) to the sound system amplifier where they undergo final amplification. The audio signals are then output on the following speakers over discrete lines:
- Left front door speaker group
- Right front door speaker group
- Left rear door speaker group
- Right rear door speaker group
- Bass box speaker
- Center cockpit speaker (centerfill)
- Left rear surround speaker
- Right rear surround speaker

The audio signal for the bass box speaker travels from the COMAND operating, display and controller unit via MOST to the amplifier for sound system and from there, over direct lines via the subwoofer amplifier to the bass box speaker.

For vehicles except code 810 Sound system, the audio signals undergo final amplification by the COMAND operating, display and controller unit and are then output over the following speakers via a direct line:
- Left front door speaker group
- Right front door speaker group
- Left rear door speaker group
- Right rear door speaker group
- Center cockpit speaker (centerfill)

AM tuner function sequence (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 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 RBDS, with code 494 USA version, or RDS, except code 494 USA version
^ An RBDS or RDS station has been set
^ The "RBDS" or "RDS" function is activated.

User navigation for controlling DVD/CD functionality and displaying supplemental information is carried out via the display of the COMAND operating, display and controller unit.

In vehicles with code 810 Sound system, the data exchange between the COMAND operating, display and controller unit and the sound system amplifier takes place via the MOST.
The audio output takes place over the following speakers:
- Left front door speaker group
- Right front door speaker group
- Left rear door speaker group
- Right rear door speaker group
- Bass box speaker
- Center cockpit speaker (centerfill)
- Left rear surround speaker
- Right rear surround speaker

The audio signal for the bass box speaker travels from the COMAND operating, display and controller unit via MOST to the amplifier for sound system and from there, over direct lines via the subwoofer amplifier to the bass box speaker.

For vehicles except code 810 Sound system, the audio signals undergo final amplification by the COMAND operating, display and controller unit and are then output over the following speakers via a direct line:
- Left front door speaker group
- Right front door speaker group
- Left rear door speaker group
- Right rear door speaker group
- Center cockpit speaker (centerfill)

The DVD/CD menu and the Title menu stored on the inserted DVD/CD and the DVD/CD slots occupied, are shown on the control unit display. Slots "1" to "6" are numbered consecutively. The appearance and functional scope of the menus depend on the specific medium. In the event that one of the two menus is missing on the DVD/CD, the control unit display provides a corresponding menu item with a gray background.

General Music Register, with code (512) COMAND APS with DVD changer
On the integrated hard drive in the COMAND operating, display and controller unit, files (in MP3 format) can be stored from the CD/ DVD via the SD interface and then called up as required.





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