Component description for the radio

P82.87-6515-06

Location

The radio is located in the center console.

Tasks

The radio has the following tasks:

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

The radio provides the user with a structured and uniform user interface that is displayed on the Audio/COMAND display (A40/8).

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) (with code 510 (Audio 20 CD with 6-disk CD changer); with code 523 (Audio 20 CD) and code 494 (USA version))

Direct line

The radio is equipped with the following direct connections (inputs):

 Circuit 30g

 Circuit 31

 FM, AM and CL [ZV] antenna amplifier (A2/18)

 FM 2, DAB and TV antenna amplifier (A2/19)

 Bluetooth® antenna (A2/91)

 Inside rearview mirror microphone (A67b1)

 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))

 Wake-up for MOST (bidirectional) (with code 510 (Audio 20 CD with 6-disk CD changer); with code 523 (Audio 20 CD) and code 494 (USA version))

 Signal for mute function (with code 348 (Emergency call/assist system) or code 359 (TELEAID emergency call system))

 Bracket for navigation module (A2/30-1) (with CODE 508 (Navigation box preinstallation) or CODE 509 (Navigation box))

CAN

The radio is a subscriber of the interior CAN (CAN B) and the telematics CAN (CAN A).

Media Oriented System Transport (MOST) (with code 510 (Audio 20 CD with 6-disk CD changer); with code 523 (Audio 20 CD) and code 494 (USA version))

The radio receives control and audio signals from the following control units:

 Sound system amplifier control unit (N40/3) (with CODE 810 (Sound system))

 Digital Audio Broadcasting control unit (N87/3) (with CODE 537 (Digital radio (DAB)))

 Satellite Digital Audio Radio (SDAR) control unit (N87/5) (with CODE 536 (SIRIUS satellite radio))

 Media interface control unit (N125/1) (with CODE 518 (Media interface))

Evaluation of input factors

The input values are processed in the radio.

Activation of output media and system components

The following direct output signals are possible:

 Audio output (speaker) (except CODE 810 (Sound system))

 LVDS line (low voltage differential signaling) to Audio/COMAND display

 Power supply for connected USB mass storage device (Universal Serial Bus) to USB electrical connector

 Switching voltage for telephony to the mobile phone contact plate (X237/1) (as of 01.06.2013) or to the Bluetooth® module (A34/7) (up to 31.05.2013) (with code 386 (Comfort telephony))

 Microphone output to emergency call system control unit (N123/4) (with CODE 348 (Emergency call/assist system) or CODE 359 (TELE AID emergency call system))

 Microphone output to cradle for navigation module (with CODE 508 (Navigation box preinstallation) or CODE 509 (Navigation box))

 Wake-up for MOST (bidirectional) (with code 510 (Audio 20 CD with 6-disk CD changer); with code 523 (Audio 20 CD) and code 494 (USA version))

P82.60-6570-06

Function

The status of the buttons on the radio operating panel is read in and made available to the central computer. The button operations undergo further processing in the central computer and are forwarded via MOST (with code 510 (Audio 20 CD with 6-disk CD changer); with code 523 (Audio 20 CD) and code 494 (USA version)), telematics CAN or interior CAN to the other system components in the form of messages. If the "ON" button on the radio is pressed, the radio switches on. The volume for audio and video sources is regulated by turning the "ON" button. The left button group can be used to activate the audio source requested by the user

CD drive

The integrated CD drive can be used to play audio CDs (including in MP3 format).