GF82.60-P-0005QM Audio 20 Function

GF82.60-P-0005QM Audio 20 Function
- except CODE (535) Audio 20 CD radio, USA

Component Identification:

The radio (A2) is the central control panel for the entertainment and communications systems integrated in the vehicle within the Media Oriented System Transport (MOST). One CD drive and one audio amplifier are integrated. The radio (A2) has an integrated screen to display information such as function key assignment, functions status, and operating menus.

The following functions can be operated:
^ Radio tuner
^ Audio amplifier
^ CD disk drive
^ Telephone
^ Voice control system (VCS [SBS])
^ Sound amplifier (A2/13)
^ CD player with changer (in glove compartment) (A2/6)
^ External devices (e.g. an MP3 player) via AUX jack (in glove box)

The radio (A2) can be operated via 2 main control panels, which are located on the left and right next to the display, as well as via 1 rotary pushbutton, 1 cross-shaped rocker button and 4 buttons below the display.
Some functions can be activated using the left multifunction steering wheel button group (S110) and the right multifunction steering wheel button group (S111) of the multifunction steering wheel (MFL). Here one should note that all button actuations o the multifunction steering wheel are initially processed by the instrument cluster (A1). The instrument cluster (A1) links the incoming button operations with the current menu setting at the multifunction display (A1p13) and, as appropriate, transmits a message via the controller area network bus class B (interior) CAN-B) to the radio (A2). The digital components of the radio A2) are networked to each other via the MOST. This data bus system is used to transmit data (control commands and useful information) between the various system components.

As the individual components work with different data formats and require different data exchange rates and security levels, different data bus systems have been installed:
^ MOST
^ CAN-B
^ Local Interconnect Network (LIN)

The conditions must be met for startup:
^ Circuit 15R ON
^ Vehicle voltage is 12 V
^ System check carried out without faults

System activation
If the rotary pushbutton is pressed, the radio (A2) is switched on. In each case the volume can be regulated with the pushbutton rotary switch for the audio source active.

The function keys switch over to the audio source desired by the user. The radio (A2) is operated via:
^ permanently programmed function keys
^ Alphanumeric key block
^ eject button
^ programmable function keys
^ Combination push and rotary knob with integrated hands-free button
^ cross-shaped rocker switch with pushbutton
^ ON button
^ mute button
^ Display
^ Control buttons on the MFL
^ VCS

A remote control is not planned.

The following components are actuated by the radio (A2):
^ The CD player with changer (in glove box) (A2/6)
Data exchange via MOST.
^ The Universal Portable CTEL Interface (UPCI) control unit (N123/1)
Data exchange via MOST.
^ The sound amplifier (A2/13)
Data exchange via MOST.
^ The voice control system control unit (A35/11)
Data exchange via MOST.
^ The voice control system control unit (A35/11) Data exchange via MOST. Instrument cluster (A1)
Data exchange via CAN-B.
^ An external analog audio source, which is connected to the radio (A2) via the AUX jack in the glove box. Data exchange via a discrete line.

Read out errors with the aid of STAR DIAGNOSIS
The radio (A2) has its own diagnostic trouble code memory. When the fault memory is called up by means of STAR DIAGNOSIS, the data are transmitted to the radio (A2) via the MOST and can then be read out. Diagnosis is carried out from the EIS [EZS] control unit (N73) via the CAN-B to the radio (A2).