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Home >> Mercedes Benz >> 2011 >> E 350 BLUETEC (212.024) V6-3.0L DSL Turbo (642.850) >> Repair and Diagnosis >> Accessories and Optional Equipment >> Radio, Stereo, and Compact Disc >> Description and Operation >> GF82.85-P-2030FLA Audio Mode, Function

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



GF82.85-P-2030FLA Audio Mode, Function
- with CODE (511) Audio 50 APS with DVD changer
- with CODE (525) MB Audio 50 APS radio


Function requirements, general
^ Circuit 30g ON

General
The following audio functions can be selected using the "Audio" menu item
^ Function sequence for radio mode (AM/FM)
^ Function sequence for audio DVD/CD as well as MP3 (on DVD/CD)

Further subfunctions are described in separate documents:
^ Media interface function (with code (518) Media Interface)
^ Digital audio broadcasting (DAB), function (with code (537) Digital radio)

The audio functions are operated using the following components:
- Left multifunction steering wheel button group (S110)
- Group of buttons on right of multifunction steering wheel (S111)
- Audio/COMAND control panel (A40/9)
- Control panel on the radio with auto pilot system (A2/56)
- Handsfree system microphone (A67b1) (with code (511) Audio 50 APS incl. DVD changer)

With "Circuit 15R OFF", switching on the radio with auto pilot system activates the subscribers of the Media Oriented System Transport (MOST).

Function sequence for radio mode (AM/FM)
The antennas in the rear window receive the signals of the radio frequency bands FM and AM (MW, LW, SW). The following useful signals relevant for the radio reception are modulated onto these signals:
- Music signals
- Speech signals
- Data signals (e.g. traffic information)

The signals are sent over direct lines to the FM 1, AM, CL [ZV], and KEYLESS-GO antenna amplifier (A2/18) and to the FM 2 and DAB antenna amplifier (A2/19).

The antenna amplifiers filter the frequencies of the radio frequency bands out of the received audio signals and amplify them. The amplified signals are then sent via coaxial lines to the tuner integrated into the radio with auto pilot system and then demodulated. In vehicles with code (810) Sound system, the demodulated signals are routed by the radio with auto pilot system via MOST to the sound system amplifier control unit (N40/3) where they undergo final amplification.

The audio is output by the following speakers via direct lines:
- Center dashboard speaker (H4/27)
- Left rear surround speaker (H4/54)
- Right rear surround speaker (H4/55) (model 212.2)
- Right rear surround speaker (H4/57) (model 212.0)
- Left front door sound system tweeter (H4/68)
- Right front door sound system tweeter (H4/69)
- Left rear door sound system tweeter (H4/70)
- Right rear door sound system tweeter (H4/71)
- Left front door sound system midrange and bass speakers (H4/72)
- Right front door sound system midrange and bass speakers (H4/73)
- Left rear door sound system midrange speaker (H4/80)
- Right rear door sound system midrange speaker (H4/81)

On the bass speaker (H4/17) (model 212.0) or the bass speaker (H4/29) (model 212.2), the audio signal runs from the radio with auto pilot system to the sound system amplifier control unit via MOST and from there via direct lines over the rear bass speaker amplifier (N40/9) to the bass speaker.

In vehicles without code (810) Sound system, the audio signals are output directly by the radio with auto pilot system to the following speakers:
- Left front door speaker (H4/1)
- Left front door tweeter (H4/1h1)
- Right front door speaker (H4/2)
- Right front door tweeter (H4/2h1)
- Left rear door speaker (H4/3)
- Left rear door tweeter (H4/3h1)
- Right rear door speaker (H4/4)
- Right rear door tweeter (H4/4h1)

The function sequence for radio mode also consists of the following subfunctions:
^ Function sequence for AM tuner (MW, LW, SW)
^ FM double tuner function sequence with phase diversity (FM)
^ Function sequence for radio data system (RDS)
^ Function sequence for Radiotext+ (as of 1.6.2010)

Function sequence for AM tuner (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 radio with auto pilot system demodulates these signals. In other words, it separates the useful signals (audible frequencies) from the carrier signal (inaudible).

FM double tuner function sequence with phase diversity (FM)
For the FM radio frequency band, the useful signals are broadcast using frequency modulation (FM). The FM double tuner integrated into the radio with auto pilot system demodulates these signals. In other words, it also separates the useful signals (audible frequencies) from the carrier signal (inaudible).

The radio with auto pilot system also enables an additional reception-specific changeover between the two antenna amplifiers.

Function sequence for radio data system (RDS)
In addition to the normal radio program, many FM radio stations also transmit additional digital information such as station names, program type (PTY) (e.g. pop, culture, etc.) and traffic program identification. This information is evaluated by the radio with auto pilot system and shown on the audio/COMAND display (A40/8) if the following prerequisites are met:
- An RDS station is tuned in.
- The "RDS" function is activated

Function sequence for Radiotext+ (as of 1.6.2010)
During FM radio operation, additional information on the program can be shown on the Audio/COMAND display. For this, the "Info" softkey in the function bar must be pressed.

Function sequence for audio DVD/CD as well as MP3 (on DVD/ CD)
On the radio with auto pilot system with code (511) Audio 50 APS with DVD changer, a DVD changer is integrated and with code (525) MB Audio 50 APS radio, a single DVD drive is installed. This enables audio CDs and audio DVDs to be played (even MP3 format). User guidance for controlling DVD/CD functionality and displaying supplemental information is carried out via the Audio/ COMAND display.
In vehicles with code (810) Sound system, the data is exchanged between the radio with auto pilot system and the sound system amplifier control unit over MOST.

The audio is then output by the following speakers via direct lines:
- Center instrument panel speaker
- Left rear surround speaker
- Right rear surround speaker
- Left front door sound system tweeter
- Right front door sound system tweeter
- Left rear door sound system tweeter
- Right rear door sound system tweeter
- Left front door sound system midrange and bass speakers
- Right front door sound system midrange and bass speakers
- Left rear door sound system midrange speaker
- Right rear door sound system midrange speaker

On the bass speaker, the audio signal is routed from the radio with auto pilot system to the sound system amplifier control unit via MOST and from there via the rear bass speaker amplifier using direct lines to the bass speaker.

In vehicles without code (810) Sound system, the audio signals are output directly by the radio with auto pilot system to the following speakers:
- Left front door speaker
- Left front door tweeter
- Right front door speaker
- Right front door tweeter
- Left rear door speaker
- Left rear door tweeter
- Right rear door speaker
- Right rear door tweeter





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