GF82.85-P-3136FQA Component Description For COMAND Controller Unit
GF82.85-P-3136FQA Component Description For COMAND Controller Unit
MODEL 218
- with CODE (526) COMAND with single DVD drive (without navigation)
- with CODE (528) COMAND with DVD changer
Shown on vehicle up to 30.6.11 without code (518) Media interface
A40/3 COMAND control unit
A40/8 Audio/COMAND display
X39/45 AUX jack electrical connector (without code (518) Media Interface)
Shown on vehicle as of 1.7.11 with code (518) Media interface
A40/3 COMAND control unit
A40/8 Audio/COMAND display
X18/70 Media interface electrical connector (with code (518) Media Interface)
X115 USB electrical connector
Location
The COMAND controller unit is integrated at the front center into the center console, the AUX electrical connection (without code (518) Media interface) and as of 1.7.11 the USB electrical connection are located in the center armrest's stowage compartment.
Task
The COMAND controller unit fulfills the following tasks:
^ Central operating unit for the entertainment and communication systems integrated into the vehicle
^ Reading in the controls and input signals
^ Evaluation of input factors
^ Activation of output media and system components
Central operating unit for the entertainment and communication systems integrated into the vehicle
The COMAND controller unit provides the user with a structured and uniform interface for the following system components:
- Video
- DVD
- Telephony
- Media interface for external audio or mass storage devices (with code (518) Media interface)
- Audio
- Radio
- CD, DVD
- Memory card
- AUX electrical connection in center console stowage compartment under the armrest, for external audio devices (without code (518) Media interface)
- USB electrical connection (as of 1.7.11)
- Bluetooth(R) audio (as of 1.7.11)
- System settings and (as of 1.7.11) Fuel consumption indicator
Reading in the controls and input signals
The input factors are read in via the following connections:
^ Direct line
^ Media Oriented System Transport (MOST)
^ CAN
Direct lines
The COMAND controller unit reads in the following signals via a direct line from the corresponding components:
- AM and FM-1 signals from FM 1, AM, ZV and KEYLESS-GO (A2/18) antenna amplifier
- FM 2 signals from FM 2 and DAB antenna amplifier (A2/19)
- Audio signals for telephony and Bluetooth(R) audio from the Bluetooth antenna (A2/91)
- Telephony signals from handsfree system microphone (A67b1)
- Mute signal from emergency call system control unit (N123/4) (with code (359) TELE AID emergency call system)
- Audio signals from AUX jack electrical connector (without code (518) Media interface)
- Audio signals from USB electrical connection (as of 1.7.11)
- Image signals for Night View Assist via Y lines from Night View Assist control unit (N101) (with code (610) Night View Assist)
- Video signals over a Y/C line from the media interface electrical connector (X18/70) (with code (518) Media interface)
- Diagnosis signals for COMAND fan motor (M4/13)
Media Oriented System Transport (MOST)
The COMAND controller unit receives audio signals from the following control units via MOST:
- Satellite Digital Audio Radio (SDAR) control unit (N87/5) (with code (536) SIRIUS satellite radio)
- Media interface control unit (with code (518) Media interface)
CAN
The COMAND controller unit uses the telematics CAN (CAN A) and the interior CAN (CAN B).
The functions resulting therefrom are described in the corresponding function descriptions (see block diagram or function schematic).
Evaluation of input factors
The input values are processed in the COMAND controller unit.
Activation of output media and system components
The system components are actuated via the following connections:
^ Direct line
^ MOST
^ CAN
Direct line
In each case, the COMAND controller unit sends signals via direct lines to the following components:
- Audio signals to the speaker system (without code (810) Sound system):
- Left front door speaker (H4/1)
- Left front door tweeter (H4/1h1)
- Right front door speaker (H4/2)
- Right front door tweeter (H4/2h1)
- Left rear door speaker (H4/3)
- Left rear door tweeter (H4/3h1)
- Right rear door speaker (H4/4)
- Right rear door tweeter (H4/4h1)
- Video signals via low voltage differential signal (LVDS) line to the Audio/COMAND display (A40/8).
- Microphone output to emergency call system control unit (with code (359) TELE AID emergency call system)
- Control signals for COMAND fan motor
In addition to issuing electrical signals, the COMAND controller unit also sends voltages to the following components via a direct line:
- Power supply for COMAND fan motor
- Wake-up for MOST to following control units:
- Sound system amplifier control unit (N40/3) (with code (810) Sound system)
- Satellite digital audio radio (SDAR) control unit (with code (536) SIRIUS satellite radio)
- Media interface control unit (with code (518) Media interface)
MOST
The COMAND controller unit sends the following signals via MOST:
- Audio signals:
- Sound system amplifier control unit (with code (810) Sound system)
- Control signals:
- Sound system amplifier control unit (with code (810) Sound system)
- Satellite digital audio radio (SDAR) control unit (with code (536) SIRIUS satellite radio)
- Media interface control unit (with code (518) Media interface)
CAN
The COMAND controller unit is a telematics CAN and interior CAN subscriber. The resulting functions are described in the corresponding function descriptions (see block diagram or function schematic).
Design
Shown on vehicle up to 30.6.11
1 Function keys
2 Keypad
3 "ON" button
4 Volume control ring collar
5 CD, DVD eject button
6 "C" button (deletes individual characters or complete entry)
7 "Skip back" button
8 "Skip forward" button
9 Memory card slot
10 Memory card ejector button
11 CD, DVD drive
Furthermore, the following components are integrated into the COMAND controller unit:
- Operating panel for controlling the audio and telematics functions
- Radio dual tuner
- High definition (HD) radio tuner
- CD/DVD drive (with code (526) COMAND with single DVD drive (without navigation))
- CD/DVD changer (with code (528) COMAND with DVD changer)
- Card reader for memory cards
- Bluetooth(R) receiver
- Central computer
- Audio amplifier
Function
^ Controls
^ DVD drive
^ Card reader for memory cards
Operating elements
The buttons on the operating panel of the COMAND controller unit are read in and relayed to the central computer. The button operations are processed further in the central computer and forwarded via MOST, the telematics CAN and the interior CAN to the other system components in the form of messages. If the ON button on the COMAND controller unit is pressed, the COMAND controller unit is switched on.
The volume is regulated by turning the "ON" button. The function keys switch over to the audio source desired by the user.
In the event of system fault or system crash, pressing the "ON" button for t = 8 s will reboot the COMAND controller unit.
DVD drive
The integrated DVD drive can be used to play an audio CD/DVD or a video DVD.
Card reader for memory cards
With the aid of the integrated card reader, data from a memory card can be stored on the internal hard disk and then called up.
Card reader variants
In vehicles up to 30.6.11 the card reader is compatible with Personal Computer Memory Card International Association (PCMCIA) memory cards.
In vehicles as of 1.7.11 the card reader is compatible with Secure Digital (SD) memory cards.
Variants
The COMAND controller unit is available in the following variants:
- Code (526) COMAND with single DVD drive (without navigation)
- Code (528) COMAND incl. DVD changer, up to 30.6.11 or as of 1.7.11
Diagnosis
The COMAND controller unit is the diagnosis gateway for all MOST users. The diagnostic communication takes place between the COMAND controller unit and the front SAM control unit with fuse and relay module (N10/1) via the interior CAN. The diagnostic communication between the front SAM control unit with fuse and relay module and the diagnostic connector (X11/4) connected to the diagnostic tester is performed via diagnostic CAN (CAN D).
