Component Description For Rear Display Left/Right - GF82.90-P-4020GR

MODEL 166

up to model year 2016

with CODE 864 (Rear entertainment system)

Location

The left rear display is located on the left front seat behind the head restraint. The right rear display is located on the right front seat behind the head restraint.

Illustrated on model 166.0

Fig 1: Rear Display Component Location - Model 166 up to model year 2016

Courtesy of MERCEDES-BENZ USA

The two displays are identical. The pin assignment (cf. connector A, pin 5) in document "Left/right rear display pin/connector assignment") is used to differentiate between the left and right rear displays. The left rear display is connected to terminal 31.

Tasks

Visualization of all user-relevant information in rear entertainment system
Use of all audio equipment or video units connected to the rear display
Power and resource management
Man Machine Interface (MMI)
Receive signals
Generation of picture signals
Generating radio signals
Transmitting signals

Visualization of all user-relevant information in rear entertainment system

Graphic displays for user guidance
Operation
Display of digital picture signals

Use of all audio equipment or video units connected to the rear display

Use also includes the management of the connected devices as well as detection of any connected video units. The following audio equipment or video units can be connected via the AUX jack, for example:

MP3 player, portable DVD player
Video cameras
Game consoles

Media sources connected via "AUX" must always be selected manually. Only then can connected video units be detected and their video signals played back.

Power and resource management

Detection of overvoltage/undervoltage combined with appropriate switch on/off behavior.

Man Machine Interface (MMI)

Enables the communication between the rear passenger or the rear passengers and the rear entertainment system by means of the infrared (IR) interfaces of the remote control and the rear display.

Receive signals

Controller Area Network (data bus/CAN bus) (CAN)
Direct lines

Controller Area Network (data bus/CAN bus) (CAN)

The rear display is a subscriber of the telematics CAN (CAN A). It communicates with the following components:

Audio equipment (radio (A2) or COMAND controller unit (A40/3))
DVD player (A40/4)

Direct lines

Power supply via circuit 30g and circuit 31
Y-brightness (luminance)/C-color information (chrominance) (Y/C) line for analog picture signals from the DVD player
Low frequency (LF) line (stereo line) for analog audio signals from the DVD player
Analog picture and audio signals from the audio equipment or video units connected to the AUX jack
Infrared signals (digital) from remote control via the infrared interface

Generation of picture signals

Generation of digital picture signals from the analog picture signals to be shown on the rear display.

Generating radio signals

Generation of digital radio signals from analog audio signals for transmission to headphones (cordless) connected via the two-way radio interface.

Transmitting signals

CAN
Direct lines

CAN

The rear display is a subscriber of the telematics CAN. It communicates with the following components:

Audio equipment (radio or COMAND controller unit)

Body

An amplifier for the integrated headphone socket (3.5 mm) is integrated into the rear display.

The rear display has the following features:

8" thin film transistor (TFT) color display
Display format 16:9
Maximum resolution 800 x 480 pixels, 3 x 6 bit color depth (able to display 262, 144 colors)
DVD player

Direct lines

Electrical analog signals (frequency) (audio signals) to headphones connected via cable
Radio signals (digital audio signals) to the radio frequency headphones (cordless) via the radio interface

The volume of the audio signals can only be adjusted via the remote control for the headphones connected by cable to the headphone socket. For the headphones (cordless) connected via the IR or radio interface, the volume of the audio signals is adjusted via the volume control integrated in the IR headphones.

Setup of the screen using the "Disk" menu item in the "DVD-V" menu as an example

Technical data Designation	Unit	Values	Remarks
Left rear display and right rear display
Voltage supply	V	12	On-board electrical system voltage (U _BNom )
Voltage limits	V	6	Minimum (U _Bmin )
	V	9	Minimum (U_Bmin ) (for background illumination)
	V	16	Maximum (U _Bmax )
Power consumption	-	Unknown	Standby
	A	1	Action
	-	Unknown	Additional action
	μA	100	No-load current (maximum) (I ₀ )
Reverse polarity protection	-	-	The inputs and outputs are protected against polarity reversal.
Additional specific parameters	CD	450	Light intensity (typical)
Flash capability/coding capability	-	-	Yes/yes