Component description for COMAND controller unit - GF82.85-P-3136FLM

MODEL 212 as of 3/2/15 as of model year 2016 with CODE 531 (COMAND APS) 

Shown on model 212.0 

Fig 1: COMAND Controller Unit - Shown On Model 212.0

Courtesy of MERCEDES-BENZ USA

Location 

The COMAND controller unit is located in the center console.

Tasks 

The COMAND controller unit fulfills the following tasks:

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

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

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

• Telephony
• Internet (including WLAN hotspot (Wireless Local Area Network))
• Voice control system (VCS [SBS])
• Navigation (map navigation with data from internal hard disk) including extended functions
• Digital operator's manual (interactive)
• Audio (e.g. radio, CD/DVD, Bluetooth® audio, SD card (Secure Digital), Universal Serial Bus (USB))
• Video (in high resolution or frequently used video formats such as MPEG, DIVX, WMV)
• TV (with CODE 865 (TV tuner))

The user interface is shown on the Audio/COMAND display (A40/8).

Using the "Vehicle functions" menu, equipment-dependent contents and functions of additional systems (e.g. climate control, seat adjustments) can be shown and controlled on the Audio/COMAND display.

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:

• CAN 
• Media Oriented System Transport (MOST) 
• Ethernet 
• Direct line 

CAN 

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

• The COMAND controller unit receives, e.g. the control signals from the Audio/COMAND control panel over the telematics CAN.
• The COMAND controller unit sends control signals to the Audio/COMAND display, for example, via telematics CAN.
• Over the interior CAN, the COMAND controller unit receives, e.g. from the instrument cluster (A1) the signals of the left multifunction steering wheel button group (S110) and the right multifunction steering wheel button group (S111) as well as from the front SAM control unit with fuse and relay module (N10/1) it receives, among other things, the rpm signals from the Electronic Stability Program control unit (N30/4) (except model 212.095/195/098/298 and except CODE 233 (DISTRONIC PLUS)), from the regenerative braking system control unit (N30/6) (model 212.095/195/098/298) or from the Premium Electronic Stability Program control unit (N30/7) (with CODE 233 (DISTRONIC PLUS)).
• Via interior CAN, the COMAND controller unit sends navigation displays to the instrument cluster for example.

Media Oriented System Transport (MOST) 

The COMAND controller unit exchanges data over MOST with the following control units:

• Sound system amplifier control unit (N40/3) (with CODE 810 (Sound system) or with CODE 811 (Advanced sound system))
• Tuner unit (A90/4) (with CODE 536 (SIRIUS satellite radio), with CODE 537 (Digital radio) or with CODE 865 (TV tuner))

Ethernet 

The COMAND controller unit is connected to the diagnostic connector (X11/4) via the Ethernet.

Direct line 

The COMAND controller unit has the following direct connections:

• Circuit 30g
• Circuit 31
• FM 1, AM, CL [ZV] and KEYLESS-GO antenna amplifier (A2/18) (input)
• FM 2 and DAB antenna amplifier (A2/19) (input)
• Hands-free system microphone (A67b1) (input)
• Multifunction antenna (A28/11), in vehicles with CODE 348 (Emergency call/assist system) via the global positioning system antenna splitter (A2/5) (input)
• Audio muting from the emergency call system control unit (N123/4) (with CODE 348 (Emergency call/Assist system), except CODE 810 (Sound system) and except CODE 811 (Advanced Sound System)) (input)
• Audio muting from the telematics services communications module (N112/2) (with CODE 350 (Ecall Europe emergency call system, gen. 2), except CODE 810 (Sound system) and except CODE 811 (Advanced Sound System)) (input)
• LVDS line (Low Voltage Differential Signal) from the tuner unit (with CODE 865 (TV tuner))
• Reversing camera (B84/3) (with CODE 218 (Reversing camera)) or 360° camera control unit (N148) (with CODE 501 (360 degree camera)) (input)
• Bluetooth antenna (A2/91) (input and output)
• WLAN antenna (A2/83) (input and output)
• Multimedia connection unit (A90/5) (input and output)
• COMAND fan motor (M4/13) (input and output)
• USB line to the telematics services communications module (with CODE B54 (Live Traffic Information)) (input and output)
• Dedicated Short-Range Communications control unit (A50/6) (with CODE 498 (Japan version), dealer option) (input and output)
• Vehicle Information and Communication System (VICS) control unit (A2/37) (with CODE 498 (Japan version), dealer option) (input and output)
• LVDS line for video data to the Audio/COMAND display (output)
• Wake-up for MOST (output)
• Audio output (speakers) (except CODE 810 (Sound system) and except CODE 811 (Advanced Sound System)) (output)
• Switch-on signal (Wake-up) for mobile phone contact plate (X237/1) (with CODE 386 (Comfort telephony)) and cellular telephone system antenna amplifier/compensator (A28/3) (with CODE 386 (Comfort telephony)) (output)
• Microphone output to emergency call system control unit (with CODE 348 (Emergency call/assist system)) or to the telematics services communications module (with CODE 350 (Ecall Europe emergency call system, gen. 2)) (output)

Body 

The following components are integrated in the COMAND controller unit:

• Arithmetic unit
• Hard disk
• DVD changer (with CODE 814 (DVD changer)) or single DVD drive (with CODE 815 (Single DVD drive))
• Bluetooth® receiver
• WLAN receiver
• Radio tuner for AM reception, FM phase diversity and separate FM tuner function for data services, e.g. traffic messages
• HD radio tuner (High Definition) (with CODE 494 (USA version))
• 4-channel amplifier (except CODE 810 (Sound system) or CODE 811 (Advanced Sound System))
• GPS receiver (Global Positioning System)
• Gyro sensor and 3D acceleration sensor
• Navigation processor and traffic data recorder
• COMAND electrical fuse (A40/3f1) on rear of device

Function 

• DVD drive 
• Navigation and GPS control unit 
• Gyro sensor and 3D acceleration sensor 
• Control unit for voice control system (VCS [SBS]) 

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 a 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.

Gyro sensor and 3D acceleration sensor 

The gyrosensor and the 3D acceleration sensor are used to determine vehicle direction changes. They are installed in the navigation processor. Calibration is not required.

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

The COMAND controller unit processes the voice commands, evaluates them and creates the voice output for the dialog with the user.