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Rear entertainment, TV reception, function - GF82.90-P-1003LE

MODEL 221 up to 31.5.09 with CODE (864) Rear entertainment system with CODE (863) Digital/analog TV tuner as of model year 2009/YoM 08 

Function requirements, general 

Rear entertainment, TV reception, general 

The TV combination tuner (analog/digital) (A90/1) (with code (863) Digital/analog TV tuner) provides all the customary playback options familiar from the predecessor model series. The interface is generated by the DVD player (A40/4) in the "TV" menu and shown on the screen of the left rear display (A40/5) or right rear display (A40/6).

The TV application and the relevant settings (brightness, contrast and color) can be called up and modified using the controls on the RCP (HBF) control unit (N72/2):

The signals for the listed controls on the RCP (HBF) control unit are read in by the RCP (HBF) control unit and sent over the telematics CAN to the DVD player. The additional settings using the respective buttons on the rear display are also sent over the telematics CAN to the DVD player.

IMPORTANT When the left rear display is switched on, the TV application can only be run on the left rear display.

When the right rear display is switched on, the TV application can only be run on the right rear display.

When the left rear display and right rear display are switched on, the TV application can be called up on both rear displays. Only when operating the TV application through the RCP (HBF) control unit does the left screen button or the right screen button need to be used to select the corresponding display.

The "Rear entertainment TV reception" function consists of the following subfunctions:

Selection of TV channel function sequence 

The TV channel is chosen through the COMAND controller unit (A40/3) and the front central operating unit (A40/9).

The screen button is used to activate the menu on the rear display screen. The user can select the "TV" menu with the aid of the front central operating unit and then the desired TV channel through the COMAND display (A40/8).

The TV combination tuner receives the TV signals from the TV antennas 1 to 4 in the rear window over the following path:

The front central operating unit sends the control signals over the telematics CAN to the COMAND controller unit. The COMAND controller unit evaluates them, generates the picture signals for the interface on the COMAND display and sends them over a low voltage differential signal (LVDS) line to the COMAND display. The COMAND controller unit also sends the control signals of the front central operating unit over the Media Oriented System Transport (MOST) to the TV combination tuner.

The TV combination tuner then sends, on the one hand, the signals of the received and selected TV channel over a direct line to the COMAND controller unit and, on the other hand, the analog audio signals over a stereo line and the analog picture signals over a Y-brightness (luminance)/C-color information (chrominance) (Y/C) line to the DVD player.

The DVD player forwards the analog audio and picture signals over a low voltage differential signaling line to the respective display. The user interface is displayed on the screen of the respective rear display.

Function sequence for settings in "TV" menu on rear display 

The DVD player generates the interface for the "TV" menu item on the rear display screen. With the aid of the listed controls on the RCP (HBF) control unit the following menu in the function bar can be used to change the relevant settings:

The following setting can also be made:

Full screen 

If the slider is in the application field, the "Full screen" option can be selected. Selecting this option causes all the menu bars to be hidden and the video picture to fill the entire screen on the rear display. Full-screen mode is deactivated by pressing the rear rotary pushbutton down vertically.

The hidden menu bars are shown again immediately and the video image is now displayed only in the application field.

The signals for the listed controls on the RCP (HBF) control unit are read in by the RCP (HBF) control unit and sent over the telematics CAN to the DVD player. The DVD player evaluates these signals.

Transmission of audio and picture signals function sequence 

After the signals of the receiving and selected TV channel are received by the TV combination tuner and after the signals for the listed controls on the RCP (HBF) control unit and the relevant buttons on the rear display are received, the DVD player then generates the audio and picture signals.

The audio and picture signals are sent by the DVD player over the respective low voltage differential signaling line to the rear display. The picture signals are shown on the screen of the rear display.

Audio signals are emitted over the headphones that are connected to the headphones socket on the rear display.

Alternatively, the audio signals for vehicles with code (810) Sound system can also be emitted through the vehicle's speaker system.

The audio signals are output at the volume set at the COMAND controller unit.

The signals for this are transmitted by the COMAND controller unit via the Media Oriented System Transport (MOST) to the audio tuner control unit (N93/1).

The DVD player sends the audio signals over a direct line to the audio tuner control unit. The audio tuner control unit emits the audio signals at the following speakers:

REFER TO SYSTEM WIRING DIAGRAMS Electrical function schematic for rear entertainment TV reception   PE82.90-P-2053-97SAA
  Component description for COMAND controller unit A40/3
With code (526) COMAND with single DVD drive (without navigation) or with code (527) COMAND APS with single DVD drive (with navigation)		 GF82.85-P-3136LE 
  Component description for rear entertainment DVD player A40/4 GF82.90-P-4009LE 
  Component description for rear display left/right A40/5, A40/6 GF82.90-P-4020LE 
  COMAND display, component description A40/8
Without code (867) SPLITVIEW		 GF54.30-P-6110LE
  Front central operating unit, component description A40/9 GF54.21-P-4500LE
  TV combination tuner (analog/digital), component description A90/1
For code (863) Digital/analog TV tuner		 GF82.90-P-4019LE 
  RCP [HBF] control unit, component description N72/2 GF54.21-P-4510LE
  Audio tuner control unit, component description N93/1
With code (810) Sound system		 GF82.62-P-3132LES
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