Rear entertainment, function - GF82.90-P-0002SX
MODEL 221.0/1 with CODE (864) Rear entertainment system except CODE (494) USA version up to Model Year 8
The rear entertainment is the overall entertainment system for passengers in the rear.
The central elements of the rear entertainment are the
- audio/video controller control unit (N66/3),
- left rear display (A40/5),
- right rear display (A40/6) and
- RCP [HBF] control unit (N72/2).
Function requirements
All functions are available as of an active circuit 30G. The system can be made operational by switching on the rear display (left rear display and right rear display).
The functions of the audio tuner control unit (N93/1) (with code (810) Sound system) are rendered available when the COMAND control unit (A40/3) and circuit 15R are switched on.
Rear entertainment overview (full equipment)
Rear entertainment block diagram
Audio/video controller control unit
The central element of the system is the audio/video controller control unit. It controls the
- integrated DVD disk drive,
- TV combination tuner (analog/digital) and
- optional devices, which may be connected to the AUX inputs.
The audio/video controller control unit enables rear passengers to use all audio and video sources installed on and in the control unit during a journey irrespective of the COMAND control unit actually installed in it.
The user can operate the audio/video controller control unit using the RCP [HBF] control unit and the rear display control buttons.
The audio/video controller control unit is connected over the telematics CAN with the COMAND control unit. The COMAND control unit (with code (810) Sound system) controls the audio signal output over the vehicle speakers.
To this end, the signals are sent over an analog connection from the audio/video controller control unit to the audio tuner control unit.
Additionally, the audio signals are also emitted over headphones, which can be connected to the 3.5 mm headphone socket on the rear displays.
Image transmission between the TV combination tuner (analog/digital) and audio/video controller control unit is by way of a direct connection.
Playing CDs and DVDs with the DVD player
The DVD player is integrated into the audio/video controller control unit.
The video signal can be shown optionally on one or both rear displays.
The interface is generated by the audio/video controller control unit and is shown on the rear displays.
Headphones are used for the audio output. On vehicles equipped with a sound system (Code 810), audio signal output can also take place via the audio tuner control unit and the vehicle speakers.
Additional functions over the AUX inputs
The AUX inputs of the audio/video controller control unit can be used to connect two additional video/audio devices on the rear entertainment system.
External devices can be e.g.
- portable DVD player,
- video camera,
- MP3 player and
- games consoles.
RCP [HBF] control unit
The user can actuate the rear entertainment functions at the RCP [HBF] control unit.
The settings desired by the user can be made using the following controls:
- Turn/push control
- Left "Activate screen" button
- Right "Activate screen" button
- "Back" button (twice)
Television reception by TV combination tuner (analog/digital)
The TV combination tuner (analog/digital) provides the following functions:
- Multistandard color (PAL, NTSC, Secam), multistandard sound and channel lists
- Integrated DVB-T for digital TV reception (ECE)
- Station identification (name of television channel)
- Station comparison and alternatively sound comparison for analog operation or over a so-called "service descriptor" for digital operation
- List of stations with maximum 100 stations that can currently be received
- Playing part of a track, function
- Teletext with page memory
- Digital image storage for bypassing "dead zones"
- Adaptive Video quality evaluation
- Parallel sound scheme with quality assessment
The interface is generated by the audio/video controller control unit and shown on the rear displays (left rear display, right rear display).
It is possible to make settings to the brightness, contrast, color, bass and treble from the rear. Channel selection, however, can only be made using the COMAND control unit and the front central operating unit.
Headphones are used for the audio output.
On vehicles equipped with a sound system code (810), audio signal output can also take place over the audio tuner control unit and the vehicle speakers.
The audio tuner control unit is connected to the Media Oriented System Transport (MOST). Control takes place by the COMAND control unit.
Left rear display, right rear display
The rear displays, which are integrated into the head restraints, are used for visualization of all application-relevant data in the rear entertainment system.
This means e.g. graphical displays for user guidance and operation as well as the display of video signals.
Each display has buttons for switching on/off and for regulating brightness and volume.
Apart from this, a photo sensor has been integrated for automatic brightness adaptation as well as a headphone connection (3.5 mm).
For transmission of audio and video signals between the audio/video controller control unit and the rear displays, the so-called LVDS standard (LVDS = L ow-V oltage D ifferential S ignaling) is used.
Communication between the rear displays, audio/video controller control unit and other components in the rear entertainment system takes place over the telematics CAN.
| RCP [HBF] control unit, component description | GF54.21-P-4510SX | ||
| Audio/video controller, component description | GF82.60-P-3102SX | ||
| TV tuner, component description | With code (863) Digital/analog TV tuner | GF82.60-P-3110SX | |
| Audio tuner control unit, component description | Except code (810) Sound system | GF82.62-P-3132SX | |
| with CODE (810) Sound system | GF82.62-P-3132SXS | ||
| COMAND control unit, component description | except CODE (498) Japanese version | GF82.85-P-3136SX | |
| with CODE (498) Japan version | GF82.85-P-3136SXJ | ||
| Left/right rear display, component description | GF82.90-P-4020SX |