GF82.60-P-3122CAA Component Description For Radio

GF82.60-P-3122CAA Component Description For Radio
- with CODE (523) MB Audio 20 radio
- with CODE (510) Audio 20 with CD changer

Component Identification:

Location
The radio is located in the center console.

Task
^ Operating unit for entertainment and communication systems
^ Reading in of signals
^ Evaluation of input factors
^ Actuating of system components

Operating unit for entertainment and communication systems
The radio provides the user with a structured and uniform interface for the entertainment and communication systems in the vehicle.

Reading in of 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) (with code (510) Audio 20 with CD changer)

Direct line
The following signals are read in via a direct line:
- Wake-up for MOST (bi-directional)
- AUX connection in the glove compartment, for external audio devices (without code (518) Media interface)
- FM, AM and ZV antenna amplifier (A2/18) (model 207.3) or FM, AM and ZV antenna amplifier (A2/55) (model 207.4)
- Rear window FM antenna amplifier (A2/19) (model 207.3)
- TV 3, FM2 and DAB band III (A2/54) antenna amplifier (model 207.4)
- Bluetooth antenna (A2/91)
- Hands-free system microphone (A67b1)

CAN
The radio is a subscriber of the interior CAN (CAN B) and the telematics CAN (CAN A). The signals are read in by the radio. The functions resulting therefrom are described in the corresponding function descriptions (see block diagram or function schematic).$

MOST (with code (510) Audio 20 with CD changer)
The radio receives control and audio signals from the following control units via the MOST:
- Sound system amplifier control unit (N40/3) (with code (810) Sound system)
- Digital Audio Broadcasting control unit (N87/3) (with code (537) Digital radio)
- Media interface control unit (N125/1) (with code (518) Media interface)

Evaluation of input factors
The input factors are evaluated by the microprocessor and the corresponding components are actuated.

Actuation of system components
The following output signals are output by the radio to actuate the system components:
- Audio output
- Switching voltage for mobile phone cradle (A34/15) (accessory) via the contact plate and the Bluetooth module (A34/7) (with code (386) Comfort telephony)
- Provision of a structured and uniform interface for the following system components:
- Audio system (e.g. "Radio", "CD" (also MP3), "AUX")
- Communication system (e.g. telephone with telephone book function)
- Tone settings (e.g. "bass", "treble", "fader", "balance')
- System settings (e.g. "Brightness" and "Contrast" of the Audio/COMAND display (A40/8))

The radio generates a structured and standard interface, which is then shown on the Audio/COMAND display.

Component Identification:

Function
The operating requirements that are issued via the buttons on the radio are read in by the radio itself and made available to the central computer, where they are processed and forwarded to the relevant system components accordingly via the MOST, the telematics CAN or the interior CAN.
If the "ON" button on the radio is pressed, the radio switches itself on. The volume for the relevant audio source is regulated by turning the "ON" button. The function keys in the left-hand button panel are used to switch over to the audio source selected by the user.

Variants
The following radio variants are available:
- Audio 20 radio with single CD drive (with code (523) MB Audio 20 radio)
- Audio 20 radio with CD changer (with code (510) Audio 20 with CD changer)

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

Diagnosis
The radio (with code (510) Audio 20 with CD changer) is the diagnosis gateway for all MOST subscribers. The diagnostic communication takes place between the radio 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 and the diagnostic connector (X11/4) connected to the "IS tester" is performed via diagnostic CAN (CAN D).