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Home >> Mercedes Benz >> 2007 >> SL 55 AMG (230.472) V8-5.5L SC (113.995) >> Repair and Diagnosis >> Accessories and Optional Equipment >> Radio, Stereo, and Compact Disc >> Description and Operation >> GF82.85-P-2030RI Audio Mode, Function

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



GF82.85-P-2030RI Audio Mode, Function
- with CODE (528) COMAND with DVD changer
- without navigation system
- with CODE (512) COMAND APS with DVD changer


Function requirements
^ Status "Circuit 30 ON" or "Circuit 15R ON"
^ The Cockpit Management and Data System (COMAND) is working correctly (radio function)

General
The Audio mode consists of the following function sequences which can be activated with the menu item Audio
^ Radio mode function sequence (AM/FM)
^ Player function sequence
^ General Music Register, with code (512) COMAND APS including DVD changer

Further subfunctions are described in separate documents:
^ Digital Audio Broadcasting (DAB) function, with code (537) Digital radio and with code (833) Great Britain version
^ Satellite digital audio radio (satellite radio) (SDAR) function, with code (536) SIRIUS satellite radio

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, (VCS [SBS]) with code (512) COMAND APS with DVD changer

Radio mode function requirements (AM/FM)
^ No fault in antenna system

Radio mode function sequence (AM/FM)
The function sequence is subdivided into the following subfunctions:
^ Radio mode function sequence (AM/FM), except code (494) USA version
^ Radio mode function sequence (AM/FM), with code (494) USA version
^ AM tuner function sequence (MW/LW/SW)
^ FM tuner with phase diversity function sequence (FM/ weatherband (WB) (weather information in USA)/Traffic Message Channel (TMC))
^ Radio Broadcast Data System (RBDS) or Radio Data System (RDS) function sequence

Radio mode function sequence (AM/FM), except code (494) USA version
The rear window antenna, the rear shelf antenna (A2/68), and the antennas in the windshield receive high frequency (HF) signals for the FM and AM 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 function sequence is subdivided into the following subsequences:
^ Signal course for FM reception
^ Signal course for AM reception
^ Signal course for audio output

Signal course for FM reception
The FM signals are transmitted to the COMAND operating, display and controller unit via direct lines over the following path:
- Windshield antennas
- Direct line
- Left antenna amplifier module (A2/64) or right antenna amplifier module (A2/65)
- Direct line

Signal course for AM reception
The signal course depends on the soft top status, which is relayed by the Vario roof closed limit switch (pin on right) (S69/1) via a direct line to the rear shelf antenna amplifier (A2/67). When the soft top is closed, the AM signals are forwarded to the COMAND operating, display and controller unit over the following path:
- Rear window antenna
- Direct line
- Rear window antenna amplifier module (A2/12)
- Direct line
- Rear shelf antenna amplifier
- Direct line
- Left antenna amplifier module - Direct line

When the soft top is open, the AM signals are forwarded to the COMAND operating, display and controller unit over the following path:
- Rear shelf antenna
- Direct line
- Rear shelf antenna amplifier
- Direct line
- Left antenna amplifier module
- Direct line

The antenna amplifiers filter the frequencies of the radio frequency bands out of the received HF signals and amplify them. The amplified signals are demodulated in the COMAND operating, display and controller unit in the integrated tuners.

Signal course for audio output
The demodulated audio signals in vehicles with code (810) Sound system, are output over the following path:
- COMAND operating, display and controller unit
- Media Oriented System Transport (MOST)
- Amplifier for sound system (N40/3)
- Direct line
- Speaker system

The audio output then takes place over the following speakers:
- Left door speaker group (H4/1)
- Right door speaker group (H4/2)
- Left rear speaker (H4/7)
- Right rear speaker (H4/8)
- Center cockpit speaker (centerfill) (H4/27)
- Subwoofer speaker (H4/29)

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

On vehicles except CODE (810) Sound system, final amplification of the audio signals is carried out by the COMAND operating, display and controller unit, and output takes place by means of direct lines via the following speakers:
- Left door speaker group
- Right door speaker group
- Left rear speaker
- Right rear speaker

Radio mode function sequence (AM/FM), with code (494) USA version
The rear window antenna, the rear shelf antenna, and the antennas in the windshield receive high frequency signals for the FM and AM 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. WB)

The function sequence is subdivided into the following subsequences:
^ Signal course for FM reception
^ Signal course for AM reception
^ Signal course for audio output

Signal course for FM reception
The FM signals are transmitted to the COMAND operating, display and controller unit via direct lines over the following path:
- Windshield antennas
- Direct line
- Left antenna amplifier module or right antenna amplifier module
- Direct line

Signal course for AM reception
The signal course depends on the soft top status, which is relayed by the Vario roof closed limit switch (pin on right) via a direct line to the rear shelf antenna amplifier. When the soft top is closed, the AM signals are forwarded to the COMAND operating, display and controller unit over the following path:
- Rear window antenna
- Direct line
- Rear window antenna amplifier module
- Direct line
- Rear shelf antenna amplifier
- Direct line
- Left antenna amplifier module
- Direct line

When the soft top is open, the AM signals are forwarded to the COMAND operating, display and controller unit over the following path:
- Rear shelf antenna
- Direct line
- Rear shelf antenna amplifier
- Direct line
- Left antenna amplifier module
- Direct line

The antenna amplifiers filter the frequencies of the radio frequency bands out of the received HF signals and amplify them. The amplified signals are demodulated in the COMAND operating, display and controller unit in the integrated tuners.

Signal course for audio output
The demodulated audio signals in vehicles with code (810) Sound system, are output over the following path:
- COMAND operating, display and controller unit
- MOST
- Amplifier for sound system
- Direct line
- Speaker system

The audio output then takes place over the following speakers:
- Left door speaker group
- Right door speaker group
- Left rear speaker
- Right rear speaker
- Center cockpit speaker (centerfill)
- Subwoofer speaker

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

On vehicles except CODE (810) Sound system, final amplification of the audio signals is carried out by the COMAND operating, display and controller unit, and output takes place by means of direct lines via the following speakers:
- Left door speaker group
- Right door speaker group
- Left rear speaker
- Right rear speaker

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 RBDS, with code (494) USA version, or RDS, except code (494) USA version
^ RBDS or RDS station set.
^ "RBDS" or "RDS" function activated.

RBDS function sequence, 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 shown on the display of the COMAND operating, display and controller unit.

Player function requirements
^ The medium to be played is available and correct

Player function sequence
Integrated into the COMAND operating, display and controller unit is a 6-disk DVD changer with a single slot. This enables Audio CDs and Audio DVDs to be played (even MP3 format). User guidance to control the DVD/CD functionality and to show supplemental information takes place via the display of the COMAND operating, display and controller unit.

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

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

On vehicles except CODE (810) Sound system, final amplification of the audio signals is carried out by the COMAND operating, display and controller unit, and output takes place by means of direct lines via the following speakers:
- Left door speaker group
- Right door speaker group
- Left rear speaker
- Right rear speaker

The DVD/CD menu and the title menu stored on the inserted DVD/CD and the DVD/CD slots occupied are shown in the display of the COMAND operating, display and controller unit. 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 display of the COMAND operating, display and controller unit provides the corresponding "SOFT KEY" with a gray background.

General Music Register, with code (512) COMAND APS including 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 ScanDisk (SD) interface and then called up as required.





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