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

MODEL 211, 219 with CODE (512) COMAND APS with DVD changer as of model year 09/YoM 08 

MODEL 211, 219 with CODE (528) COMAND with DVD changer with CODE (494) USA version as of model year 09/YoM 08 

General information 

The audio mode is made up of the following functions which can be activated using the Audio menu item:

Further functions are described in separate documents:

Operating instructions 

Audio functions are operated using the following components:

Function requirements 

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 

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:

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:

IMPORTANT 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.

IMPORTANT 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:

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:

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:

IMPORTANT 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.

IMPORTANT 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:

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 

Function sequence for RBDS, with code 494 USA version, or RDS, except code 494 USA version 

In addition to the normal radio program, many radio stations (FM) transmit additional digital information such as station names, program type (PTY) (e.g. pop, culture, etc.) and traffic program identification (ECE only). 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:

Function sequence for media player 

Integrated into the COMAND operating, display and controller unit is a 6-disk DVD changer with a single slot. This enables audio CDs or audio DVDs (including MPEG-1 audio layer 3 (MP3) format) to be played. The integrated SD card reader enables music files in MP3 or Windows Media Audio (WMA) formats to be played or copied into the MUSIC REGISTER.

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:

IMPORTANT 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.

IMPORTANT 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:

IMPORTANT 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.

COMAND operating, display and controller unit, component description   GF82.85-P-3134TXB 
Sound system amplifier, component description With code 810 Sound system GF82.62-P-6003TM
Subwoofer amplifier, component description With code 810 Sound system GF82.62-P-3050TM
Speaker system, component description Model 219 GF82.62-P-4220TXB
Model 211 GF82.62-P-4220TM
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