LEMON Manuals: Even more car manuals for everyone
Home >> Mercedes Benz >> 2012 >> S550 Base >> Repair and Diagnosis >> Accessories & Equipment >> Interior/Illumination Lights >> Electrical System - Body - 221 Chassis - 03 Of 10 >> Basic Knowledge >> Rear entertainment disk applications, function >> Rear entertainment disk applications, function - GF82.90-P-2003LE

Rear entertainment disk applications, function - GF82.90-P-2003LE

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 disc applications, general 

The following applications are available in the "Disc" menu:

In the audio or MP3-CD application, with the switched-on left rear display (A40/5) or right rear display (A40/6) an audio or MP3-CD inserted into the DVD drive of the DVD player can be played back.

In the video or MP3-DVD application, the switched-on rear display can be used to view a video or MP3-DVD inserted into the DVD drive of the DVD player and it can be listened to using headphones connected to the headphones socket. On vehicles with code (810) Sound system audio output through the vehicle's speaker system is also possible.

The disc applications and the relevant settings can be called up and changed using the following controls on the RCP (HBF) control unit (N72/2):

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

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

When the left rear display and right rear display are switched on, the disc application can be run on both rear displays. Only when operating the disc applications through the RCP (HBF) control unit does the screen button on the respective rear display have to be selected.

The "Rear entertainment disc applications" function consists of the following subfunctions:

Function sequence for playing back an audio or MP3-CD 

The DVD drive integrated into the DVD player deciphers the data for the inserted audio or MP3-CD and forwards it internally to the DVD player. The DVD player then uses the data from the audio or MP3-CD to generate the audio and picture signals for the rear display. The following information is shown on the application field of the screen on the rear display:

Now the function bar of the rear display screen with the listed RCP (HBF) control unit controls can be used to make the following settings:

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. The DVD player evaluates these signals.

Function sequence for playing back a video or MP3-DVD 

The DVD drive integrated into the DVD player deciphers the data for the inserted video or MP3-DVD and forwards it internally to the DVD player. The DVD player then uses the data from the video or MP3-DVD to generate the audio and picture signals for the rear display. The DVD video picture is displayed in the application field of the rear display.

Now the function bar of the rear display screen with the listed RCP (HBF) control unit controls can be used to make the following settings:

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. The DVD player evaluates these signals.

Transmission of audio and picture signals function sequence 

After deciphering the data for the audio or MP3-CD or the video or MP3-DVD and after receiving the signals for the listed controls on the RCP (HBF) control unit as well as the relevant buttons on the rear display, the DVD player generates the audio and picture signals. The audio and picture signals are sent by the DVD player over the respective low voltage differential signal (LVDS) line to the rear display.

The picture signals are shown on the screen of the respective 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).

As of circuit 15R ON status the DVD player sends the audio signals over a direct line to the audio tuner control unit.

This outputs the audio signals over the following speakers:

REFER TO SYSTEM WIRING DIAGRAMS Electrical function schematic for rear entertainment disk applications   PE82.90-P-2051-97SAA
  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
scientia non olet · About LEMON Manuals