Component description for rear display left/right - GF82.90-P-4020LEA
MODEL 221 with CODE (864) Rear entertainment system as of model year 2010/YoM 09 model refinement package
Location
The left rear display is located on the rear of the head restraint on the front seat. The right rear display is located on the rear of the head restraint on the right front seat.
The rear displays are of identical design and the decision as to whether the left or right display is used is made via the "Side" pin (left = "Side" pin to ground (circuit 31), right = "Side" pin not assigned).
Task
- Visualization of user-relevant information
- Connection detection of connected audio and video unit
- Power and resource management
- Reading in of signals
- Generation of picture signals
- Generation of infrared (IR) signals (up to 31.8.10)
- Generation of radio signals (as of 1.9.10)
- Output of audio signals
- Transmit signals
Visualization of user-relevant information
The following user-relevent information is indicated on the rear display:
- Graphic displays for user guidance
- Operation
- Display of digital picture signals
The following audio/video devices can be connected via the AUX jack:
- Portable DVD player
- Video cameras
- MP3 player
- Game consoles
Connection detection of connected video units
The rear displays recognize whether a video unit is connected to the AUX connection.
Power and resource management
The rear displays recognize overvoltage and undervoltage and react accordingly.
Reading in of signals
Signals are read in via the following connections:
- Direct lines
- Telematics CAN (CAN A)
- Infrared interface
Direct lines
The following signals are read in via direct lines:
- DVD player (A40/4)
- Analog audio and picture signals from audio equipment or a video unit connected to AUX connection
Telematics CAN
The rear displays are subscribers on the telematics CAN.
The signals are read in by the rear displays.
The functions resulting therefrom are described in the corresponding function descriptions (see block diagram or function schematic).
Infrared interface
The following signals are read in via the infrared interface:
- Control signals from remote control in position "L REAR", "R REAR"
Generation of picture signals
The rear displays generate digital picture signals from analog picture signals to display the associated screen on the display.
Generation of IR signals (up to 31.8.10)
The rear displays generate analog IR audio signals from the analog audio signals for transmission to headphones (cordless) connected via the IR interface.
Generation of radio signals (as of 1.9.10)
The rear displays generate analog radio audio signals (2.4 GHz) from the analog audio signals for transmission to headphones (cordless) connected via the radio interface.
Output of audio signals
Output of audio signals via following options:
- Analog (headphone wired)
- IR/radio (cordless headphones)
The volume of the audio signals can only be adjusted via the remote control for headphones connected by cable to the integrated headphone socket. For headphones (cordless) connected via the IR/radio interface, the volume of the audio signals is adjusted via the volume control integrated into the IR/radio headphones.
Transmit signals
The signals are transmitted via the following connections:
- Direct lines
- Telematics CAN
Direct lines
The following signals are transmitted in via direct lines:
- Electrical analog signals (frequency) (audio signals) to headphones connected via cable
Telematics CAN
The rear displays are subscribers on the telematics CAN.
The signals are transmitted by the rear display.
The functions resulting therefrom are described in the corresponding function descriptions (see block diagram or function schematic).
Design
An audio amplifier and an 8 thin film transistor (TFT) display in 16:9 format with a resolution of 800 X 480 pixels is integrated into the rear display. The color depth is 3 X 6 bit. The rear display can display a maximum of 262.144.
| Wiring diagram of audio/video controller control unit | PE82.60-P-2103-97SAC |