Rear entertainment, function

General

The rear entertainment system is the entertainment system for rear passengers. It is also referred to as the RSE (Rear Seat Entertainment).

The main constituents of the rear entertainment system are

 the DVD player (A40/4) and

 the rear displays (left rear display (A40/5) and right rear display (A40/6)).

-----------------------------------------------------------------------------------------

DVD player

The DVD player is the main component. It controls and processes the signals of the internal DVD drive and the optional equipment that can be connected to the AUX inputs.

It allows the rear passenger to use all of the audio and video sources connected to the DVD player while driving, independently of the installed COMAND operating, display and control unit (A40/3), radio and navigation unit (A2/56) or radio (A2). The user can operate the DVD player using the rear entertainment remote control (A8/6) and the function keys on the rear display.

-----------------------------------------------------------------------------------------

Rear displays

These are integrated in the front seats and are used to display all user-related information. These are graphical displays for user guidance and operation and video signal displays.

Each rear display has the following elements:

 Operating switch for switching on and off, and controlling the brightness and the volume

 Photo sensor for automatic brightness control

 Headset connection (3.5 mm)

 Infrared sensor for rear entertainment remote control.

An LVDS (LVDS = Low-Voltage Differential Signaling) transmission procedure is used for transmitting video and audio between the DVD player and the rear displays.

Communication between the rear displays and the DVD player takes place using the telematics CAN.

P82.90-2322-09

Rear entertainment overview

(full equipment)

A40/3 COMAND operating, display and control unit

A40/4 DVD player

A40/5 Left rear display

A40/6 Right rear display

H4/3 Left rear door speaker

H4/4 Right rear door speaker

H4/5 Left front door speaker

H4/6 Right front door speaker

H4/36 Right rear door tweeter

H4/54 Left rear surround speaker

H4/57 Right rear surround speaker

N40/3 Amplifier for sound system

H4/27 Center cockpit speaker (centerfill)

H4/29 Subwoofer

H4/33 Left front door tweeter

H4/34 Right front door tweeter

H4/35 Left rear door tweeter

P82.90-2323-09

Rear entertainment block diagram (full equipment)

1 Switch-on request

2 Operation

3 Video signals

4 Audio signals

5 Headphones

6 AUX connections

A8/6 Rear entertainment remote control

A40/3 COMAND operating, display and control unit

A40/4 DVD player

A40/5 Left rear display

A40/6 Right rear display

H4/36 Right rear door tweeter

H4/54 Left rear surround speaker

H4/57 Right rear surround speaker

N40/3 Amplifier for sound system

X30/35 Telematics CAN voltage distributor connector

A Telematics CAN

MOST Media Oriented System Transport (MOST)

H4/3 Left rear door speaker

H4/4 Right rear door speaker

H4/5 Left front door speaker

H4/6 Right front door speaker

H4/27 Center cockpit speaker (centerfill)

H4/29 Subwoofer

H4/33 Left front door tweeter

H4/34 Right front door tweeter

H4/35 Left rear door tweeter

System functions

Function requirements

All functions are available as of active circuit 30. The system can be started by switching on the rear display.

The audio signals can be output via the speakers with the COMAND operating, display and control unit, the radio and navigation unit or the radio switched on.

-----------------------------------------------------------------------------------------

Functions

The following applications are available in the rear entertainment system:

 Disc applications

- Audio CD

- MP3 CD/DVD

- Video DVD

 AUX functions (game consoles, etc.)

-----------------------------------------------------------------------------------------

Play CDs and DVDs using the DVD player

The signals (video signals) of the DVD player can only be shown on the rear display.

The video signals can be shown on one of the rear displays or both at the same time. The operating interface is generated by the DVD player and shown on the rear displays.

The headphone socket is used as the audio output. The audio signal can also be output over the vehicle speakers. In this case the output is controlled via the COMAND operating, display and control unit.

-----------------------------------------------------------------------------------------

Additional AUX input functions

Two additional video or audio sources can be connected to the rear entertainment system via the AUX inputs of the DVD player. Examples are:

 Portable DVD player

 Video cameras

 MP3 player

 Game consoles

The DVD player does not provide a device-specific interface for these devices. The video signal can be shown on one or both rear displays. The headphone sockets are used as the audio output. If only one rear display is switched on, only the relevant headphone socket is used. The audio signal can also be output over the vehicle speakers. In this case the audio output is controlled via the COMAND operating, display and control unit, for example.

-----------------------------------------------------------------------------------------

Control of sound system

The sound system amplifier that is installed as special equipment is connected to the MOST bus. The audio signals are transmitted by the DVD player via an analog low frequency line to the COMAND operating, display and control unit, for example, and from there via the MOST bus to the sound system amplifier, which outputs the audio signals via the speakers.

If no sound system amplifier is installed, the audio signals are output via the speakers by the COMAND operating, display and control unit, for example.

-----------------------------------------------------------------------------------------

Operation

Switching on

The system is activated by switching on the display. To switch on a rear display, press the "ON/OFF" button on a rear display. A display can also be switched on by pressing the "ON/OFF" button on the rear entertainment remote control with active circuit 15R. The corporate identity is first displayed on the screen for about
6 seconds. Then the last entertainment application called up on this rear display is started.

Base functions

 DISC,

 AUX1 or

 AUX2

can be operated using the keys of the rear entertainment remote control.

-----------------------------------------------------------------------------------------

Disc applications

If the "DISC" button is pressed on the rear entertainment remote control, the inserted CD or DVD is detected automatically and the relevant screen is displayed.

If no CD or DVD has been inserted or a valid data format was not detected, an error message is displayed on the screen.

The equipment is operated and adjusted using the rear entertainment remote control via soft keys at the edge of the screen. The soft keys can be scrolled through using the rotary wheel of the rear entertainment remote control.

To activate a soft key or acknowledge a setting, push vertically down on the rotary wheel. If a soft key has been activated, the setting can be made within six seconds. If nothing is done within six seconds, the display returns to the base display.

-----------------------------------------------------------------------------------------

Screen display of DVD application

The following DVD functions can be operated using the soft keys:

 Play (Play)

 Stop (Stop)

 Full screen display (Full scn)

 DVD menu (Menu)

 Settings (Settings)

 Sound

 Display brightness (Bright)

 Contrast (Contr)

 Colors (Color)

-----------------------------------------------------------------------------------------

Screen display of CD audio application

The following CD audio functions can be operated using the soft keys:

 Track search (Scan)

 Settings (Settings)

 Bass (Bass)

 Treble (Treble)

-----------------------------------------------------------------------------------------

Screen display of MP3 CD/DCD application

The following functions can be operated using the soft keys:

 Track browser (Presets)

 Track search (Scan)

 Settings (Settings)

 Bass (Bass)

 Treble (Treble)

-----------------------------------------------------------------------------------------

AUX applications

External devices such as video consoles and DVD players can be connected via the AUX connections on the DVD player. These devices are detected automatically.

The relevant screen is displayed, depending on whether a device with video or audio output is detected. The information only appears on the rear displays using menu item "AUX1" or "AUX2".

The functions are controlled by the device that is connected to the AUX input.

System settings base menu

The following adjustments can be made in the system settings:

 Display brightness (Bright)

 Day/night design switchover (Design)

 Display shut-off (Pic off/Pic on)

 Language (Speech)

 Speaker

The speaker menu item is used to select whether the audio data from the left or right side of the rear entertainment are output via the speakers. The audio signal output to the speakers is controlled via the COMAND operating, display and control unit, for example.