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 installed into 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

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Central operating unit for the entertainment and communication systems integrated into the vehicle

The COMAND controller unit provides users with a structured and uniform control surface.

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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)

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 (X39/45) (without code (518) Media Interface) or Media Interface electrical connector (X18/70) (with code (518) Media Interface) (access in glove compartment up to 31.5.2011, access in stowage compartment (telephone compartment) beneath center armrest as of 1.6.2011)

- USB electrical connector (X115), as of 1.7.2011

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

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

- Bluetooth antenna (A2/91)

- Multifunction antenna (A28/11)

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

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

- Y-brightness (luminance)/C-color data (chrominance) (Y/C) lines from TV-digital tuner (A90/3)

- Y-lines from Night View Assist control unit (N101)
(with code (610) Night View Assist)

- Reversing camera control unit (N66/2)

- VICS control unit (A2/37) (dealer option)

- Electronic Toll Collection control unit (A50/3) (dealer option)

- Communications control unit (N123/6), up to 31.5.2010

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

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CAN

The COMAND controller unit is a telematics CAN (CAN A) and interior CAN (CAN B) subscriber

Media Oriented System Transport (MOST)

Control and audio signals from the following control units:

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

- TV digital tuner

- Media interface control unit (N125/1)
(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 (direct to speakers)
(without code (810) Sound system)

- Video output: Low voltage differential signaling (LVDS) line transmits picture and video signals from the COMAND controller unit to the Audio/COMAND display (A40/8)

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

- Switching voltage for the communications control unit, up to
31.5.2010

- Switching voltage for VICS control unit (Dealer option)

- Actuation of Electronic Toll Collection control unit
(Dealer option)

- COMAND fan motor (power supply and control)

P82.86-9062-06

Design

Shown on vehicle up to 30.6.2011

1 Function keys

2 Keypad

3 "ON" button

4 CD/DVD eject button

5 "C" button

6 "Skip back" button

7 "Skip forward" button

8 Memory card slot

9 Memory card ejector button

10 CD/DVD drive

The following components are also integrated into the COMAND controller unit:

- Central computer

- Navigation and GPS control unit

- Hard disk

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

- Bluetooth® receiver for basic telephony

- Radio tuner

Function

 Controls

 DVD drive

 Navigation and global positioning system (GPS) control unit

 Turn rate sensor

 Control unit for voice control system (VCS [SBS])

 Card reader for memory cards

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Controls

The function keys and keypad of the operating panel on 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 read in data from the navigation DVD (e.g. navigation update) or play an audio CD/DVD or video DVD.

 Only genuine audio CDs can be converted to the MP3 format and stored on the hard disk.

Navigation and global positioning system (GPS) control unit

The navigation and GPS control unit is integrated into the COMAND controller unit and calculates the vehicle location using the incoming antenna signals, the wheel speeds and the signal of the turn rate sensor and calculates the vehicle route after the destination has been entered.

Turn rate sensor

The turn rate sensor determines the direction changes of the vehicle. It is installed in the navigation and GPS control unit. A calibration is not required.

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Control unit for voice control system (VCS [SBS])

The voice commands are processed and evaluated in the COMAND controller unit. The voice outputs for the dialogue with the user are generated in the COMAND controller unit.

Card reader for memory cards

With the aid of the integrated card reader, data (except audio data) from a memory card can be stored on the internal hard disk and then called up. Audio data on the memory card can be played from it, but not copied onto the hard disk.

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.

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Variants

The COMAND controller unit is available in the following variants:

- up to 30.6.2011

- As of 1.7.2011

In the variant as of 1.7.2011 the COMAND controller unit in combination with a suitable mobile phone is Internet compatible.

Diagnosis

The COMAND controller unit is the diagnosis gateway for all MOST subscribers and the directly connected communications control unit (up to 31.05.2010). 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).