GF82.85-P-3136FLA COMAND Controller Unit, Component Description

GF82.85-P-3136FLA COMAND Controller Unit, Component Description
- with CODE (528) COMAND with DVD changer

Component Identification:

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
^ Reads 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:
- Audio
- Radio
- CD/DVD audio
- Personal Computer Memory Card International Association (PCMCIA) memory card
- AUX jack in glove box for external audio equipment (without code (518) Media interface)

- Video
- DVD

- Media interface for external audio or mass storage devices (with code (518) Media interface)
- Communication (telephone)
- Voice control system (VCS [SBS])

Reads in the controls and input signals
The input factors are read in via the following connections:
^ Direct line
^ Controller Area Network (data bus/CAN bus) (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 input 1 (without code (518) Media interface)
- Audio mute (with code (359) TELE AID emergency call system)
- FM 1, AM, CL and KEYLESS-GO antenna amplifier (A2/18) - Antenna amplifier FM 2 and DAB (A2/19)
- Bluetooth antenna (A2/91)
- Hands-free system microphone (A67b1) (2 microphones)
- Y-brightness (luminance)/C-color information (chrominance) (Y/ C) and audio lines from DVD player (A40/4) (with code (864) Rear entertainment system)
- Y lines from:
- Night View Assist control unit (N101) (with code (610) Night View Assist)
- Reversing camera power supply module (N66/10) (with code (218) Reversing camera)
- Media interface control unit (N125/1) (with code (518) Media interface)

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

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: Speaker (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)
- COMAND fan motor (M4/13) (power supply, speed control and diagnosis)
- Microphone output to emergency call system control unit (N123/4) (with code (359) TELE AID emergency call system)

Component Identification:

Furthermore, the following components are integrated into the COMAND controller unit:
- Operating panel for controlling the audio and telematics functions
- Radio tuner including high definition (HD) radio tuner
- CD/DVD changer
- Card reader for PCMCIA memory cards
- Bluetooth(R) receiver for basic telephony
- Central computer
- Internal hard disk
- Audio amplifier (without code (810) Sound system)

Function
^ Operating elements
^ DVD drive
^ Card reader for PCMCIA memory cards

Operating elements
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.

DVD drive
The integrated DVD drive can be used to play an audio CD/DVD or a video DVD.

Card reader for PCMCIA memory cards
With the aid of the integrated card reader, data from a PCMCIA memory card can be stored on the internal hard disk and then called up.

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 "IS tester" is performed via the diagnostic CAN (CAN D).