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Home >> Mercedes Benz Truck >> 2010 >> G 550 (463.236) V8-5.5L (273.963) >> Repair and Diagnosis >> Accessories and Optional Equipment >> Radio, Stereo, and Compact Disc >> Description and Operation >> GF82.85-P-2030GAJ Audio Mode, Function

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




GF82.85-P-2030GAJ Audio Mode, Function
MODEL 463.236 /270 up to 31.5.12
- with CODE (EU1) COMAND APS
- with CODE (ZJ1) Japan version as of Model Year 2009 /YoM 08





1 Circuit status
2 AM/FM, signal
3 Multifunction steering wheel button group, signal
4 VCS switch, signal
5 Hands-free system microphone group, signal
6 Audio, signal
7 Instrument cluster, message
A1 Instrument cluster
A2/71 Amplifier module 1, window antenna
A2/73 Amplifier module 3, window antenna
A40/3 COMAND operating, display and controller unit
A67b1 Hands-free system microphone group
H4/1 Left front door speaker
H4/2 Right front door speaker
H4/5 Left rear door speaker
H4/6 Right rear door speaker
H4/7 Left rear loudspeaker
H4/8 Right rear loudspeaker
H4/27 Center cockpit speaker (centerfill)
H4/29 Subwoofer speaker (with code (EU9) Surround sound system (harman/kardon Logic 7))
H4/33 Left cockpit tweeter
H4/34 Right cockpit tweeter
H4/37 Left rear door tweeter (with code (EU9) Surround sound system (harman/kardon Logic 7))
H4/38 Right rear door tweeter (with code (EU9) Surround sound system (harman/kardon Logic 7))
N40/9 Sound system amplifier (with code (EU9) Surround sound system (harman/kardon Logic 7))
N73 EIS [EZS] control unit
N80 Steering column module
N135 LIN converter
S93/2 VCS switch
S110 Left multifunction steering wheel button group
S111 Right multifunction steering wheel button group
CAN B Interior CAN
LIN Local interconnect network
MOST Media Oriented System Transport

Function requirements, general
^ Circuit 30 On or circuit 15R On status
^ COMAND operating, display and controller unit activated using the "ON" button
^ "Audio" base function selected
^ No fault in antenna system (radio function)
^ Radio station broadcasts additional digital information (Vehicle Information and Communication System (VICS))
^ Data DVD or data CD is inserted or transferred to hard disk

General information on audio mode
The audio mode is made up of the following partial functions which can be activated using the "Audio" menu item:
^ Radio mode function sequence (amplitude-modulated (AM)/ frequency-modulated (FM))
^ Disk function sequence
^ Memory card function sequence
^ Music Register function sequence
A further partial function is described in a separate document:
^ Media interface function (with code (EH3) Media interface)

Operating instructions on audio mode
Audio functions can be selected, activated and adjusted with the following components:
- Control buttons on COMAND operating, display and controller unit
- Left multifunction steering wheel button group and right multifunction steering wheel button group
- Voice control system (VCS [SBS])

Radio mode function sequence (AM/FM)
The radio mode function sequence is subdivided into the following subfunctions:
^ Radio mode function sequence (AM/FM)
^ AM tuner function sequence
^ FM tuner with phase diversity function sequence

Radio mode function sequence (AM/FM)
The amplifier module 1, window antenna and the amplifier module 3, window antenna 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. VICS signals for current traffic information)
The amplifier modules filter the frequencies of the radio frequency bands out of the received HF signals and amplify them. The amplified signals are then sent via coaxial lines (FM, AM) to the tuner integrated into the COMAND operating, display and controller unit where they are demodulated and undergo final amplification.
The demodulated audio signals in vehicles with code (EU9) Surround sound system (harman/kardon Logic 7) are routed from the COMAND operating, display and controller unit via MOST to the sound system amplifier where they undergo final amplification.
The audio output is then sent by the following speakers via direct lines:
- Left front door speaker
- Right front door speaker
- Left rear door speaker
- Right rear door speaker
- Left rear speaker
- Right rear speaker
- Center cockpit speaker (centerfill)
- Subwoofer speaker
- Left cockpit tweeter
- Right cockpit tweeter
- Left rear door tweeter
- Right rear door tweeter
In vehicles without code (EU9) Surround sound system (harman/ kardon Logic 7), the audio signals are output by the COMAND operating, display and controller unit over the following speakers via direct lines:
- Left front door speaker
- Right front door speaker
- Left rear door speaker
- Right rear door speaker
- Left rear speaker
- Right rear speaker
- Center cockpit speaker (centerfill)
- Left cockpit tweeter
- Right cockpit tweeter

AM tuner function sequence
In this radio frequency band, the useful signals are broadcast by means of amplitude modulation. 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 with phase diversity function sequence
In this radio frequency band, the useful signals are broadcast by means of frequency modulation. The FM tuner integrated into the COMAND operating, display and controller unit demodulates these signals. In other words, they also separate the useful signals (audible frequencies) from the carrier signal (inaudible). The COMAND operating, display and controller unit also switches between the amplifier modules, depending on the reception quality.
This function runs automatically.

Disk function sequence
The disk function sequence comprises the following subfunctions:
^ DVD, CD or MP3 function sequence
^ AUX function sequence

DVD, CD or MP3 function sequence
A DVD drive is integrated into the COMAND operating, display and controller unit. The audio CDs or DVDs (including in MP3 format) are read in via the DVD drive and processed internally by the COMAND operating, display and controller unit. The user interface for controlling the disk functions (e.g. track selection) and for displaying supplemental information (e.g. track) is provided on the display of the COMAND operating, display and controller unit.
The audio signals in vehicles with code (EU9) Surround sound system (harman/kardon Logic 7) are routed from the COMAND operating, display and controller unit via MOST to the sound system amplifier where they undergo final amplification.
The audio output is then sent from the sound system amplifier via direct lines to the following speakers:
- Left front door speaker
- Right front door speaker
- Left rear door speaker
- Right rear door speaker
- Left rear speaker
- Right rear speaker
- Center cockpit speaker (centerfill)
- Subwoofer speaker
- Left cockpit tweeter
- Right cockpit tweeter
- Left rear door tweeter
- Right rear door tweeter
In vehicles without code (EU9) Surround sound system (harman/ kardon Logic 7), the audio signals are output by the COMAND operating, display and controller unit over the following speakers via direct lines:
- Left front door speaker
- Right front door speaker
- Left rear door speaker
- Right rear door speaker
- Left rear speaker
- Right rear speaker
- Center cockpit speaker (centerfill)
- Left cockpit tweeter
- Right cockpit tweeter

AUX function sequence
If an external device (e.g. MP3 player) is connected via the AUX jack and the "AUX" menu item is called up, the base screen is displayed.
Only two speaker symbols are shown in the display.
Selection or settings via function bar:
- "AUX"
- No other submenus
- "Tone"
- Configuration of audio output
The menu navigation and display of the connection options are shown on the display of the COMAND operating, display and controller unit and are dependent on the particular portable terminal that is connected.
The audio signals in vehicles with code (EU9) Surround sound system (harman/kardon Logic 7) are routed from the COMAND operating, display and controller unit via MOST to the sound system amplifier where they undergo final amplification.
The audio output is then sent from the sound system amplifier via direct lines to the following speakers:
- Left front door speaker
- Right front door speaker
- Left rear door speaker
- Right rear door speaker
- Left rear speaker
- Right rear speaker
- Center cockpit speaker (centerfill)
- Subwoofer speaker
- Left cockpit tweeter
- Right cockpit tweeter
- Left rear door tweeter
- Right rear door tweeter
In vehicles without code (EU9) Surround sound system (harman/ kardon Logic 7), the audio signals are output by the COMAND operating, display and controller unit over the following speakers via direct lines:
- Left front door speaker
- Right front door speaker
- Left rear door speaker
- Right rear door speaker
- Left rear speaker
- Right rear speaker
- Center cockpit speaker (centerfill)
- Left cockpit tweeter
- Right cockpit tweeter

Memory card function sequence
If a memory card is inserted into the SD slot of the COMAND operating, display and controller unit and the "Memory card" menu item is called up, the base screen is displayed.
The following appears on the display:
- Number of tracks on the memory card
- Current track with elapsed play time
- Artist, track names or group, if stored
The audio signals in vehicles with code (EU9) Surround sound system (harman/kardon Logic 7) are routed from the COMAND operating, display and controller unit via MOST to the sound system amplifier where they undergo final amplification.
The audio output is then sent from the sound system amplifier via direct lines to the following speakers:
- Left front door speaker
- Right front door speaker
- Left rear door speaker
- Right rear door speaker
- Left rear speaker
- Right rear speaker
- Center cockpit speaker (centerfill)
- Subwoofer speaker
- Left cockpit tweeter
- Right cockpit tweeter
- Left rear door tweeter
- Right rear door tweeter
In vehicles without code (EU9) Surround sound system (harman/ kardon Logic 7), the audio signals are output by the COMAND operating, display and controller unit over the following speakers via direct lines:
- Left front door speaker
- Right front door speaker
- Left rear door speaker
- Right rear door speaker
- Left rear speaker
- Right rear speaker
- Center cockpit speaker (centerfill)
- Left cockpit tweeter
- Right cockpit tweeter

Music Register function sequence
Files (in MP3 format) from the DVD or CD can be stored on the hard disk integrated in the COMAND operating, display and controller unit via the DVD drive of the COMAND operating, display and controller unit as well as from a memory card via the SD slot of the COMAND operating, display and controller unit and then called up as desired. If the "Music register" menu item is called up, the default screen is displayed. The following appears on the display:
- Artist
- Current track with elapsed play time
- Number of titles in directory of hard disk
The audio signals in vehicles with code (EU9) Surround sound system (harman/kardon Logic 7) are routed from the COMAND operating, display and controller unit via MOST to the sound system amplifier and undergo final amplification.
The audio output is then sent from the sound system amplifier via direct lines to the following speakers:
- Left front door speaker
- Right front door speaker
- Left rear door speaker
- Right rear door speaker
- Left rear speaker
- Right rear speaker
- Center cockpit speaker (centerfill)
- Subwoofer speaker
- Left cockpit tweeter
- Right cockpit tweeter
- Left rear door tweeter
- Right rear door tweeter
In vehicles without code (EU9) Surround sound system (harman/ kardon Logic 7), the audio signals are output by the COMAND operating, display and controller unit over the following speakers via direct lines:
- Left front door speaker
- Right front door speaker
- Left rear door speaker
- Right rear door speaker
- Left rear speaker
- Right rear speaker
- Center cockpit speaker (centerfill)
- Left cockpit tweeter
- Right cockpit tweeter




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