GF82.61-P-4111RC Radio/Navigation Unit, Component Description

GF82.61-P-4111RC Radio/Navigation Unit, Component Description
- with CODE (525) MB Audio 50 APS radio

Component Identification:

Location
The radio and navigation unit is located in the center console.

Task
The radio and navigation unit performs the following tasks:
^ Central operating and display unit for the entertainment and communication systems integrated into the vehicle
^ Reads in the controls and input signals
^ Evaluation of input factors
^ Actuates output media

Central operating and display unit for the entertainment and communication systems integrated into the vehicle
The radio and navigation unit provides the user with a structured and uniform user interface.

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 radio and navigation unit comes with the following direct connections:
- Circuit 30
- Circuit 31
- Wake-up for MOST (bidirectional)
- AUX input 1 (access in glove box), except code (518) Media interface
- Left antenna amplifier module (A2/64)
- Bluetooth antenna (A2/91)
- GPS antenna (A2/23)
- Hands-free system microphone group (B25)

CAN
- The radio and navigation unit is a subscriber of the interior CAN

MOST
Control and audio signals from and to the following control units:
- Amplifier for sound system (N40/3), with code (810) Sound system
- Digital Audio Broadcasting control unit (N87/3), with code (537) Digital radio and code (833) Great Britain version
- Media interface control unit (N125/1), with code (518) Media interface

Evaluation of input factors
The input factors are processed in the radio and navigation unit.

Actuates output media
The following direct output signals are possible:
- Audio OUT (speakers), except code (810) Sound system
- External fan (power supply, speed control and diagnosis)
- Switching pulse for left antenna amplifier module
- Power supply for GPS antenna
- AUX jack in glove box, except code (518) Media interface
- Media interface (UCI), with code (518) Media interface

Front view and button assignment

Component Identification:

Design
The radio and navigation unit consists of the following components:
- Control panels for controlling the audio, navigation and telematics functions
- DVD drive
- Central computer
- Navigation processor
- Audio amplifier, except code (810) Sound system

Function
The following function areas are included in the radio and navigation unit:
^ Control panels and central computer
^ DVD drive
^ Navigation and GPS control unit
^ Turn rate sensor

Control panels and central computer
The information of the control panel buttons on the radio and navigation unit is read in and made available for the central computer. Button actuations are further processed in the central computer and sent to additional system components as messages via the MOST or interior CAN.
Pressing the rotary switch on the radio and navigation unit switches on the radio and navigation unit. The volume for the respective set audio source is regulated by turning the rotary switch. The function keys switch over to the audio source desired by the user.

DVD drive
Data can be read from the navigation DVD or an audio CD and an MP3-CD can be played using the integrated DVD drive.

Navigation and GPS control unit
The navigation processor is integrated into the radio and navigation unit and calculates the location of the vehicle using the incoming antenna signals. It also calculates the vehicle's route after the destination has been entered.

Turn rate sensor
The turn rate sensor determines the direction changes of the vehicle. It is installed into the navigation processor. A calibration is not required.