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Rear entertainment AUX applications, function - GF82.90-P-2004LE

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

Function requirements, general 

Rear entertainment AUX applications, general 

2 additional video units or pieces of audio equipment can be connected to the rear entertainment system via the two AUX inputs of the DVD player. These may be portable DVD players, video cameras, MP3 players or games consoles, for example.

No equipment-specific interface for these video units or this audio equipment is provided by the DVD player.

Only one interface is provided for the following setting in the menu "AUX 1" or "AUX 2":

The video units or audio equipment are controlled using the video unit or audio equipment itself.

The video or audio device is detected automatically.

Depending on whether a device with video or audio output is detected, the corresponding screen is displayed on the respective rear display.

Video or audio output is performed automatically.

The settings in the menu "AUX 1" or "AUX 2" occur via the following controls of the rear control panel control unit (N72/2):

IMPORTANT With the left rear display switched on, the video or audio output and the settings can only be performed in the left rear display.

With the right rear display switched on, the video or audio output and the settings can only be performed in the right rear display.

With the left rear display and right rear display switched on, the video or audio output and the settings can be performed in both rear displays. The respective rear display must be selected using the screen button only when performing settings via the rear control panel control unit.

The rear entertainment AUX applications function comprises the following subfunctions:

Video unit detected function sequence 

The DVD player automatically recognizes the connection of a video unit via the AUX input 1 or AUX input 2. The DVD player uses the transmitted data of the video unit to generate the audio and picture signals for the rear display. The video image is shown in full-screen mode in the application field of the screen on the rear display.

Full-screen mode is ended by pressing the rear rotary pushbutton vertically down. The hidden menu bars are shown again immediately and the video image is now displayed only in the application field.

Now the following settings can be made via the following menu item in the function bar of the screen on the rear display using the listed controls of the rear control panel control unit:

If the slider is in the application field, the "Full screen" option can be selected. This causes all menu bars to be hidden and the video image to be shown in full-screen mode again.

The signals of the listed controls of the rear control panel control unit are read in by the rear control panel control unit and sent via telematics CAN to the DVD player.

The additional settings via the respective buttons at the rear display are also sent via telematics CAN to the DVD player. The DVD player evaluates these signals.

Audio unit detected function sequence 

The DVD player automatically recognizes the connection of audio equipment via the AUX input 1 or AUX input 2. The DVD player uses the transmitted data of the audio equipment to generate the audio and picture signals for the rear display. All menu bars are shown on the screen of the rear display. Now the corresponding settings can be changed using the listed controls of the rear control panel control unit via the following menu item in the function bar:

The signals of the listed controls of the rear control panel control unit are read in by the rear control panel control unit and sent via telematics CAN to the DVD player.

The additional settings via the respective buttons at the rear display are also sent via telematics CAN to the DVD player. The DVD player evaluates these signals.

Transmission of audio and picture signals function sequence 

After transmitting the data from the video unit or audio equipment and after reception of the signals of the listed controls of the rear control panel control unit as well as of the respective buttons at the rear display, the DVD player generates the audio and picture signals. The audio and picture signals are sent by the DVD player via the respective low voltage differential signal (LVDS) line to the rear display.

The picture signals are output via the screen of the respective rear display. The audio signals are output via the headphones that are connected to the headphone jacks at the rear displays.

As an alternative, there is also the option of outputting the audio signals via the speaker system of the vehicle on vehicles with code (810) Sound 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).

As of the status Circuit 15R ON, the DVD player sends the audio signals via a direct line to the audio tuner control unit. The audio tuner control unit outputs the audio signals over the following speakers:

REFER TO SYSTEM WIRING DIAGRAMS Electrical function schematic for rear entertainment AUX applications   PE82.90-P-2050-97SAA
  Component description for COMAND controller unit A40/3 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 
  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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