Component description for COMAND controller unit

P54.30-9800-06

Shown on model 212.0

A40/3 COMAND control unit

Location

The COMAND controller unit is located in the center console.

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

- Media interface for external audio or mass storage devices (with code (518) Media interface)

- Communication (telephony)

- System settings and (as of 1.7.2011) Fuel consumption indicator

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- Audio

- Radio

- CD/DVD audio

- Memory card

- Electrical connection for AUX connector (X39/45) (without code (518) Media interface), access up to 31.5.2011 in glove compartment, as of 1.6.2011 in stowage compartment (telephone compartment) below the center armrest, for external audio devices

- USB electrical connector (X115) (as of 1.7.2011),
in stowage compartment (telephone compartment) under the center armrest

- Bluetooth® audio (as of 1.6.2010)

Reading in the controls and input signals

The input factors are read in via the following connections:

 Direct line

 CAN

 Media Oriented System Transport (MOST)

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Direct line

The COMAND controller unit has the following direct connections:

- Circuit 30g

- Circuit 31

- Wake-up for MOST (bi-directional)

- AUX jack electrical connector (without code (518) Media Interface)

- USB electrical connector (as of 1.7.2011)

- Emergency call system control unit (N123/4) (with code (359) TELEAID emergency call system) (audio muting)

- FM 1, AM, CL and KEYLESS-GO antenna amplifier (A2/18)

- Antenna amplifier FM 2 and DAB (A2/19)

- Bluetooth antenna (A2/91)

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- Hands-free system microphone (A67b1) (2 microphones)

- Audio line from DVD player (A40/4)
(with code (864) Rear entertainment system)

- Color video baseband signal (CVBS) from:

- Reversing camera power supply module (N66/10)
(with code (218) Reversing camera)

- Media interface electrical connector (X18/70)
(with code 518) Media Interface)

- Night view assist control unit (N101)
(with code (610) Night view assist)

- COMAND fan motor (M4/13) (diagnosis)

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CAN

The COMAND controller unit uses the telematics CAN (CAN A) and the interior CAN (CAN B).

Media Oriented System Transport (MOST)

The COMAND controller unit receives control and audio signals from the following control units:

- Sound system amplifier control unit (N40/3)
(with code (810) Sound system)

- Satellite digital audio radio (SDAR) control unit (N87/5)
(with code (536) SIRIUS satellite radio, as of 1.6.2010)

- SDAR/high definition tuner control unit (N87/8)
(with code (536) SIRIUS satellite radio, up to 31.5.2010)

- Media interface control unit
(with code (518) Media interface)

Evaluation of input factors

The input values are processed in the COMAND controller unit.

Activation of output media and system components

- Audio output (without code (810) Sound system)

- Video output: Low Voltage Differential Signal (LVDS) line to Audio/COMAND display (A40/8) (picture and video signals)

- Microphone output to emergency call system control unit
(with code (359) TELE AID emergency call system)

- Y - brightness (luminance)/C - color information (chrominance) line for analog picture signals to DVD player
(with code (864) Rear entertainment system)

- Stereo line for analog signals to DVD player
(with code (864) Rear entertainment system)

- COMAND fan motor (power supply and control)

P82.87-3061-06

Design

Shown on vehicle up to 30.6.2011

1 Function keys

2 Keypad

3 "ON" button

4 CD/DVD load button

5 "C" button (delete individual characters or the complete entry)

6 "Skip back" button

7 "Skip forward" button

8 Memory card slot

9 Memory card ejector button

10 CD/DVD drive

Furthermore, the following components are integrated into the COMAND controller unit:

- Radio tuner including high definition (HD) radio tuner

- CD/DVD changer (with code (528) COMAND incl. DVD changer) or CD/DVD drive (with code (526) COMAND with single DVD drive (without navigation))

- Card reader for memory cards

- Bluetooth® receiver

- Central computer

- Audio amplifier

Function

 Controls

 DVD drive

 Card reader for memory cards

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Controls

The function keys and the keypad at the COMAND controller unit are read in and provided 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 for each audio source set 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.

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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 30.6.2011 the card reader is compatible with Personal Computer Memory Card International Association (PCMCIA) memory cards.

In vehicles as of 1.7.2011 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 30.6.2011 or as of 1.7.2011

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 and the diagnostic connector (X11/4) connected to the "IS tester" is performed via diagnostic CAN (CAN D).