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Home >> Mercedes Benz >> 2009 >> S 550 (221.171) V8-5.5L (273.961) >> Repair and Diagnosis >> Accessories and Optional Equipment >> Radio, Stereo, and Compact Disc >> Description and Operation >> GF82.85-P-2030LE Audio Mode, Function

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



GF82.85-P-2030LE Audio Mode, Function
- with CODE (527) COMAND APS with single DVD drive (with navigation)
- with CODE (526) COMAND with single DVD drive (without navigation)


Function requirements, general
^ C. 30g ON or c. 15R ON
^ COMAND controller unit (A40/3) is switched on
^ "Audio" menu selected
^ No fault in antenna system (radio function)

General information on the audio mode
The audio mode consists of the following component functions:
^ Radio mode function sequence (AM/FM)
^ Disk and MP3 function sequence

The following components are available for control of the audio system:
- Front central operating unit (A40/9)
- Left multifunction steering wheel button group (S110) and right multifunction steering wheel button group (S111)
- Hands-free system microphone group (A67b1) (up to 31.5.09 with code (813) Voice control system (VCS [SBS]) or as of 1.6.09)
- Center console button group (S148)
- Remote control (with code (816) Entertainment remote control or code (867) SPLITVIEW or in model 221 with code (864) Rear entertainment system)

The audio signals in model 216 are output via the following components:
- Left door speaker group (H4/1) (without code (810) Sound system)
- Right door speaker group (H4/2) (without code (810) Sound system)
- Left door rear speaker (H4/3)
- Right door rear speaker (H4/4)
- Bass module speaker (H4/17)
- Center cockpit speaker (centerfill) (H4/27)
- Additionally with code (810) Sound system:
- Left rear surround speaker (H4/54)
- Right rear surround speaker (H4/57)
- Left door sound tweeter (H4/68)
- Right door sound tweeter (H4/69)
- Left door sound woofer and midrange speaker group (H4/72)
- Right door sound woofer and midrange speaker group (H4/73)

The audio signals in model 221 are output via the following components:
- Left front door speaker group (H4/1) (without code (810) Sound system)
- Right front door speaker group (H4/2) (without code (810) Sound system)
- Left rear door speaker group (H4/3)
- Right rear door speaker group (H4/4)
- Bass module speaker
- Center cockpit speaker (centerfill)
- Additionally with code (810) Sound system:
- Left rear surround speaker
- Right rear surround speaker
- Left front door sound tweeter (H4/68)
- Right front door sound tweeter (H4/69)
- Left front door sound woofer and midrange speaker group (H4/72)
- Right front door sound woofer and midrange speaker group (H4/73)

Radio mode function sequence (AM/FM)
The antenna structures in the rear window receive 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 signals:
- Music signals
- Speech signals
- Data signals (e.g. Traffic Message Channel (TMC) messages (traffic information))

The signals are routed to the rear window antenna amplifier module (A2/12) via direct lines.
The rear window antenna amplifier module filters the radio frequency band frequencies from the frequency signals received, and amplifies these. The amplified signals are then transmitted via coaxial lines (FM, AM) to the audio tuner control unit (N93/1), where they are demodulated, undergo final amplification, and all output over the speaker system.

The user guidance interface is generated by the COMAND controller unit and displayed on the COMAND display (A40/8) (without code (867) SPLITVIEW) or on the SPLITVIEW display (A40/10) (with code (867) SPLITVIEW).

The radio mode (AM/FM) function is made up of the following subfunctions:
^ Function sequence for AM reception (MW, LW, SW)
^ Function sequence for FM reception
^ Function sequence for radio data system (RDS) reception

Function sequence for AM reception (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 in the audio tuner control unit demodulates these signals. In other words, it separates the useful signals (audible frequencies) from the carrier signal (inaudible).

Function sequence for FM reception
For the FM radio frequency band, the useful signals are broadcast using frequency modulation. The FM double tuner integrated in the audio tuner control unit demodulates these signals.
In other words, it also separates the useful signals (audible frequencies) from the carrier signal (inaudible). The audio tuner control unit also enables an automatic reception-specific changeover.

Additional function requirements for RDS reception
^ RDS function activated
^ Radio stations also transmit additional digital information

Function sequence for RDS reception
Apart from the normal radio program, many radio stations (FM) transmit additional digital information such as station names, program type (e.g. pop, culture) and traffic program identification.

This information is evaluated by the COMAND controller unit and shown on the COMAND display or the SPLITVIEW display.

Disk and MP3 function sequence
A DVD drive is integrated into the COMAND controller unit. This DVD drive can play the following media and formats:
- DVD video
- DVD audio
- DVD ROM (audio/video data)
- Audio CD
- CD ROM (audio or video data)
- CD-R
- CD-R/W
- MP3
- WMA (Windows Media Audio)

The user guidance for controlling the DVD functionality (e.g. track selection) and for displaying supplemental information (e.g. track) is on the COMAND display or the SPLITVIEW display.





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