Rear entertainment switch on/off behavior and system settings, function - GF82.90-P-2002LE
MODEL 221 up to 31.5.09 with CODE (864) Rear entertainment system as of model year 2009/YoM 08
Function requirements, general
- Circuit 30 ON and telematics CAN (CAN A) for t = 10 min active (a vehicle door is opened) or circuit 15R ON
- Rear entertainment system is switched on and operating properly
Rear entertainment ON/OFF behavior and system settings, general
- For circuit 30 ON and active telematics CAN or for circuit 15R ON the rear entertainment system is switched on or off using the "ON/OFF" button on the left rear display (A40/5) or the right rear display (A40/6).
The following applications are available following switch-on:
- "Disk":
- "TV" (with code (863) Digital/analog TV tuner)
- "AUX1" (e.g. video camera, MP3 player or games console)
- "AUX2" (e.g. video camera, MP3 player or games console)
Pressing the "ON/OFF" button on the left rear display only switches on the left rear display, and the listed applications can only be run on the left rear display.
Pressing the "ON/OFF" button on the right rear display only switches on the right rear display, and the listed applications can only be run on the right rear display.
Pressing the "ON/OFF" button on the left rear display and on the right rear display switches on both rear displays, and the listed applications can be run on both rear displays. Only when operating the applications using the RCP (HBF) control unit (N72/2) is it necessary to use the left screen button (N72/2s5) or the right screen button (N72/2s4) to select the respective rear display.
The following settings can also be made after switch-on:
- System settings
- Background illumination control on rear display
- Audio signal volume control
The rear entertainment ON/OFF behavior and system settings function consists of the following subfunctions:
- Switch on function sequence
- Function sequence for additional settings through RCP (HBF) control unit
- Function sequence for additional settings using buttons on rear display
- Switch off function sequence
Switch on function sequence
The switch-on signal from the "ON/OFF" button on the rear display is forwarded over the telematics CAN to the DVD player (A40/4). The DVD player then sends for approx. t = 6 s the audio and picture signals for the corporate identity screen over a low voltage differential signal (LVDS) line to the rear display. The DVD player then sends the audio and picture signals of the application that was last active before switch-off over the low voltage differential signal (LVDS) line to the rear display.
For vehicles with code (810) Sound system and for selection of the "speaker" setting in the "System setting" area, the audio signals are also sent over a direct line to the audio tuner control unit (N93/1).
Function sequence for additional settings through RCP (HBF) control unit
The "System settings" menu on the lower screen edge of the rear display can be used to make the relevant settings in the following menu items:
- "Display":
- "Display off"
- "Day screen"
- "Night screen"
- "Automatic"
- "Language": Selection of system language
- "Speaker" (with code (810) Sound system): Output of audio signals as of circuit 15R ON status over the speaker system
If both rear displays are switched on, the "Speaker" menu item can be used to select the respective rear display, whose audio signals are to be emitted as of circuit 15R ON status at the speaker system.
Selection of the menu items and the settings are made using the controls on the RCP (HBF) control unit:
- Right screen button
- Left screen button
- Right "Back" button (N72/2s6)
- Left "Back" button (N72/2s7)
- Rear rotary pushbutton (N72/2s8)
The screen button is used to activate the menu on the rear display screen.
Function sequence for additional settings using buttons on rear display
The following buttons on the rear display can be used to make the relevant settings on the respective rear display:
- "-" and "+" buttons (with a sun as symbol):
- Background illumination control on display
- "-" and "+" buttons ("VOL" lettering)
- Audio signal volume control
The signals for the listed buttons are sent over the telematics CAN to the DVD player. The DVD player evaluates the signals and sends the audio and picture signals over the respective low voltage differential signaling line to the rear display. For vehicles with code (810) Sound system and for selection of the "speaker" setting in the "System setting" area, the audio signals are also sent as of circuit 15R ON status over a direct line to the audio tuner control unit.
Along with the manual control for the background illumination for the rear display a photosensor is also integrated into the rear display. The signals are read in, evaluated and transformed as with the manual control of the background illumination for the respective rear display.
Switch off function sequence
The switch-off signal from the "ON/OFF" button on the rear display is forwarded over the telematics CAN to the DVD player.
The DVD player then saves the last used application of the rear display and interrupts the forwarding of the audio and picture signals.
| Electrical function schematic for rear entertainment switch on/off behavior and system settings | PE82.90-P-2052-97SAA | ||
| 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 |