GF82.61-P-4109-04QM Radio and Navigation Unit, Function

GF82.61-P-4109-04QM Radio And Navigation Unit, Function
- with CODE (525) MB Audio 50 APS radio


The buttons and switches of the panel in the radio and navigation unit (A2/56) are read in and supplied to the central computer. The button operations are processed further in the central computer and passed to the other system components via the Media Oriented System Transport (MOST) or the class B (interior) controller area network bus (CAN-B) in the form of a controller area network (data bus/CAN bus) (CAN) message.
The radio and navigation unit (A2/56) switches on when the user presses the ON button on the rotary switch. The volume for the set audio source is regulated at the rotary switch. The function keys switch over to the audio source desired by the user. Three fixed contrast settings can be retrieved so that the information on the display can be seen more clearly.
^ Day design
^ Night design
^ Driver's light

Continuous brightness adjustment is also possible.

Audio CD drive
Data can be read from the special navigation CD or an audio CD can be played using the integrated CD drive.

Navigation CD
The following are on the navigation CD:
^ Program data for execution in navigation processor
^ Voice data for voice output
^ Map data.

Navigation processor and GPS control unit.
The navigation processor is integrated in the radio and navigation unit (A2/56) and calculates the location of the vehicle from the incoming antenna signals. It also calculates the vehicle's route after the destination has been entered.

The navigation processor evaluates the satellite signals coming from the GPS antenna (A2/23) and uses them to calculate the position of the vehicle. Signals from at least 4 satellites are required for the first position calculation. Signals from 3 satellites are sufficient for additional calculations. If these conditions for position calculation are not met, only the number of satellites appears in the display.

Yaw rate sensor
The yaw rate sensor determines the direction changes of the vehicle. It is installed in the navigation processor. Calibration is not required.

Traffic data recorder
The traffic data recorder is located in the radio and navigation unit (A2/56). The received data is stored for a maximum of 30 minutes, also during the "run-on time" (up to 100 messages).

The traffic data recorder decodes the messages and transmits them to the navigation processor as required. For synchronization the traffic data recorder requires a current "location list" from the navigation processor. The monitory points required for checking the road network (e.g. freeway exits) are defined by unambiguous numbers in the "location list". The "location list" is stored on the navigation CD. It is loaded automatically into the traffic data recorder by the navigation processor as required.

STAR DIAGNOSIS
The radio and navigation unit (A2/56) has its own fault memory. When the fault memory is called up using STAR DIAGNOSIS, the data is transmitted via the MOST to the radio and navigation unit (A2/56) 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).

The radio and navigation unit (A2/56) cannot output errors.