Component Description For COMAND Controller Unit - GF82.85-P-3136RD

Model 172.4 

up to model year 2017 

with code 512 (COMAND APS with DVD changer) 

Model 172.4 

up to model year 2017 

with code 527 (COMAND APS with single DVD drive (with navigation)) 

Shown on model 172.4 with code 512 (COMAND APS incl. DVD changer) 

Location 

The COMAND controller unit is located in the center console.

Tasks 

The COMAND controller unit fulfills the following tasks:

• Central operating unit for entertainment and communication systems integrated into vehicle 
• Reading in of input signals as well as actuation of output media and system components 

Central operating unit for entertainment and communication systems integrated into vehicle 

The COMAND controller unit provides the user with a structured and uniform user interface for the following system components:

• Radio (AM, FM, HD radio (with code 494 (USA version)))
• CD/DVD audio
• Music Register
• SD (Secure Digital) card
• Bluetooth® Audio
• USB electrical connector (X115) in stowage compartment (telephone compartment) under the armrest
• AUX connection electrical connector (X39/45) (up to 29.11.2013) in stowage compartment (telephone compartment) under the armrest, for external audio devices (except CODE 518 (Media Interface))
• DVD video
• TV (with CODE 498 (Japan version))
• Media interface for external audio or mass storage devices (with CODE 518 (Media Interface))
• Internet (except code 359 (TELEAID emergency call system))
• Telephony
• Navigation (map navigation with data from internal hard disk)
• Voice control system (VCS [SBS])
• Digital operator's manual
• Emergency call (with CODE 347 (Mercedes-Benz emergency call system))
• Telematics services communications module (N112/2) (with CODE B54 (Live Traffic Information))

Reading in of input signals as well as actuation of output media and system components 

The COMAND controller unit sends and receives signals via the following connections:

• Controller Area Network (CAN) 
• Media Oriented System Transport (MOST) 
• Direct line 

Controller Area Network (CAN) 

• The COMAND controller unit is a telematics CAN (CAN A) subscriber.
• The COMAND controller unit is an interior CAN (CAN B) subscriber.

Media Oriented System Transport (MOST) 

The COMAND controller unit exchanges control and audio signals with the following control units:

• Digital TV tuner (A90/3) (with CODE 498 (Japan version))
• Media interface control unit (N125/1) (with CODE 518 (Media interface))
• Satellite Digital Audio Radio (SDAR) control unit (N87/5) (with CODE 536 (SIRIUS satellite radio))
• Digital Audio Broadcasting control unit (N87/3) (with CODE 537 (Digital radio (DAB)))
• Sound system amplifier control unit (N40/3) (with CODE 810 (Sound system))

Direct line 

The COMAND controller unit has the following direct connections:

• Circuit 30g
• Circuit 31
• FM, AM and CL [ZV] antenna amplifier (A2/18) (input)
• FM 2, DAB and TV antenna amplifier (A2/19) (input)
• Inside rearview mirror microphone (A67b1) (input)
• GPS (global navigation system) signals from Global Positioning System antenna splitter (A2/5) (with code 348 (Emergency call/assist system) or with code 359 (TELEAID emergency call system)) (input)
• GPS signals from the multifunction antenna (A28/11) (with code 386 (Comfort telephony)) (input)
• GPS signals from the GPS antenna (A2/23) (except code 348 (Emergency call/assist system), except code 359 (TELEAID emergency call system) and except code 386 (Comfort telephony)) (input)
• Mute function (audio muting) signal from the emergency call system control unit (N123/4) (with code 348 (Emergency call/assist system) or with code 359 (TELEAID emergency call system)) (input)
• Y/C lines (Y brightness (luminance)/C color information (chrominance) from the digital TV tuner (with code 498 (Japan version)) (input)
• Composite Video Baseband Signal (CVBS [FBAS]) from the Media Interface electrical connector (X18/70) (with code 518 (Media Interface)) (input)
• AUX connection electrical connector (up to 29.11.2013, except code 518 (Media Interface)) (input)
• USB electrical connector (input and output)
• Bluetooth® antenna (A2/91) (input and output)
• COMAND fan motor (M4/13) (input and output)
• USB connection (Universal Serial Bus) to the telematics services communications module (with code B54 (Live Traffic Information)) (input and output)
• VICS control unit (A2/37) (with code 498 (Japan version), Dealer Option) (input and output)
• Dedicated Short-Range Communications control unit (A50/6) (with code 498 (Japan version) as of 01.06.2012, Dealer Option) (input and output)
• Electronic Toll Collection control unit (A50/3) (with code 498 (Japan version) up to 31.05.2012, Dealer Option) (input and output)
• Wake-up for MOST (output)
• LVDS (low voltage differential signal) line for video data to the Audio/COMAND display (A40/8) (output)
• Audio output (speaker) (except CODE 810 (Sound system)) (output)
• Switch on signal for cellular telephone system antenna amplifier/compensator (A28/3) (with code 386 (Comfort telephony) and mobile phone contact plate (X237/1) (with code 386 (Comfort telephony) as of 01.06.2013), Bluetooth® module (A34/7) (with code 386 (Comfort telephony) up to 31.05.2013)) (output)
• Microphone output to emergency call system control unit (N123/4) (with code 348 (Emergency call/assist system) or with code 359 (TELEAID emergency call system)) (output)

Body 

Detailed depiction of COMAND controller unit 

Courtesy of MERCEDES-BENZ USA

The following components are integrated in the COMAND controller unit:

• Single drive or disk changer
• SD card slot
• Operating elements
• Arithmetic unit
• HDD hard disk
• Amplifier (except CODE 810 (Sound system))
• Bluetooth® receiver
• Radio tuner
• HD radio tuner (High Definition) (with CODE 494 (USA version))
• COMAND electrical fuse (A40/3f1) (at the rear panel)

Function 

• Operating elements 
• SD card slot 
• DVD drive 
• Navigation and GPS control unit 
• Gyro sensor 
• Control unit for voice control system (VCS [SBS]) 
• Diagnosis 

Operating elements 

The status of the buttons on the operating panel of the COMAND controller unit are read in and made available 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 buttons are used to switch over to the audio source selected by the user (press buttons multiple times if necessary).

In the event of system fault or system crash, pressing the "ON" button for t = 8 s will reboot the COMAND controller unit.

SD card slot 

With the aid of the integrated card reader, data and audio files can be copied from an SD card to the HDD hard disk and then called up.

Model 172.4

as of model year 2014 up to model year 2017

with code 512 (COMAND APS with DVD changer)

Model 172.4

as of model year 2014 up to model year 2017

with code 527 (COMAND APS with single DVD drive (with navigation))

The card reader can also read SDXC cards. To save data from the COMAND controller unit onto the SD card, a PIN (Personal Identification Number) protection can be activated. If PIN protection is activated then the specified PIN has to be entered first before any data can be saved onto the SD card.

DVD drive 

With the aid of the integrated DVD drive, audio CDs/DVDs or video DVDs can be played and data (e.g. updates) from the navigation DVD can be stored on the internal hard disk.

Navigation and GPS control unit 

The navigation processor is integrated into the COMAND controller unit and calculates the location of the vehicle using the incoming antenna signals. It also calculates the vehicle's route after the destination has been entered.

Turn rate sensor (gyro sensor) 

The turn rate sensor determines vehicle direction changes. It is installed into the navigation processor. Calibration is not required.

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 dialog with the user are generated in the COMAND controller unit.

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. Diagnostic communication between front SAM control unit with fuse and relay module and the diagnostic connector (X11/4) occurs via the diagnostic CAN (CAN D).

Variants 

The COMAND controller unit is available in the following variants:

• With CODE 527 (COMAND APS with single DVD drive (with navigation))
• With CODE 512 (COMAND APS with DVD changer)

	Cockpit Management and Data System (COMAND) control unit wiring diagram	Model 172.4 up to model year 2017 with code 512 (COMAND APS with DVD changer)   Model 172.4 up to model year 2017 with code 527 (COMAND APS with single DVD drive (with navigation)) except code 498 (Japanese version)	PE82.85-P-2101-97TAA
		Model 172.4 up to model year 2017 with code 498 (Japanese version) with code 527 (COMAND APS with single DVD drive (with navigation))	PE82.85-P-2101-97TAB