CD-player mode, function

Block diagram for COMAND with CD changer up to 31.8.03, shown on model 220 with the following equipment:

 Code (810) Sound system

 Code (854) MB portable CTEL

A34/4

D2B

A2/6

A2/13

B25/6

X11/4

A1

N80

CAN-B

Diagnosis

Radio tuner

Navigation computer

Central computer

Navigation CD drive

Audio signal processing

A40/3

MFL

D2B Digital data bus

MFL Multifunction steering wheel

A1 Instrument cluster

A2/6 CD player with changer (in trunk)

A2/13 Sound amplifier

A34/4 Telephone interface

A40/3 COMAND operating, display and control unit

B25/6 Sound amplifier microphone

N80 Steering column module

X11/4 Data link connector

 On vehicles as of 1.9.03, control and video signals of the TV components are transmitted via the Media Oriented System Transport (MOST).

 On vehicles as of 1.9.03, the audio gateway control unit (N93/1) is also installed as an interface between the Controller Area Network bus class B (interior) (CAN-B) and the Media Oriented System Transport (MOST). The audio signals are then sent to the audio gateway control unit (N93/1) and output via the vehicle speakers.

CD player operation function with code (819) CD changer (6-disk)

The CD player with changer (in trunk) (A2/6) on vehicles with code (819) CD changer (6-disk) is operated via the COMAND operating, display and control unit (A40/3) and actuated via the Digital Data Bus (D2B). The audio signals of the CD player with changer (in trunk) (A2/6) are also transmitted via the D2B and amplified by the COMAND operating, display and control unit (A40/3).

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On vehicles with code (810) Sound system ,the signals are amplified by the sound amplifier (A2/13). Acoustic emission is carried out via the vehicle's loudspeaker system. The CD player with changer (in luggage compartment) (A2/6) offers the following functions which can be operated via the COMAND operating, display and control unit (A40/3):

 SCAN function

The tracks of a CD or the 1st track of the CDs of the entire magazine are played for 8 seconds. After this has been run through completely, the scan function is automatically terminated.

 Track selection

The tracks of a CD can be selected via a rocker or a numerical keypad.

 Random function

All the titles on a CD or the entire CD magazine are played in accordance with the random principle.

 Only 12-cm CDs may be used.

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 Repeat function

Alternatively, a track, a CD or all CDs in the magazine are repeated.

 Fast forward or reverse (music search)

The music played is audible during fast forward or reverse. Thus certain points of the track can be played or skipped specifically.

CD title allocation, function

Each CD contains a permanently stored so-called Table of Contents (TOC) record. The COMAND operating, display and control unit (A40/3) clearly recognizes the respective CD based on this entry and is able to automatically name it after the one-time user allocation of the track (even if the CD is subsequently inserted in another CD magazine).

In addition, the TOC entry contains information on the number of tracks and the total playing time of a CD. The COMAND operating, display and control unit (A40/3) has an integrated CD disk drive which is used for loading the navigation data or for playing audio CDs (no audio CDs can be played during navigation mode).

 On vehicles as of 1.9.02, it is possible to listen to audio CDs during navigation mode. Only the navigation CD has to be loaded previously.