Data exchange between operating unit and instrument cluster, function with code 525 - GF82.85-P-3004SK
MODEL 171.4 with CODE (525) MB Audio 50 APS radio
Control of radio and navigation unit (A2/56) on multifunction steering wheel
With the aid of the left multifunction steering wheel button group (S110) and right multifunction steering wheel button group (S111) as well as the upper multifunction display (A1p13) of the instrument cluster (A1) various systems controlled via the media-oriented system transport (MOST) can be operated and information for the system displayed. These include:
- Audio systems (radio, CD drive, CC drive)
- Telephone
The entire data exchange between the instrument cluster (A1) and the radio and navigation unit (A2/56) is performed via the local interconnect network (LIN) bus, the MOST and the controller area network bus class B (interior) (CAN-B).
All the button operations on the multifunction steering wheel are read in voltage-coded by the steering column module (N80) via the LIN-bus and placed on the interior CAN-B.
The instrument cluster (A1) recognizes the coded messages and initiates the illustration of the momentarily activated or operated systems (Audio or telephone) via the upper multifunction display(A1p13)
In parallel with this, the audio gateway control module (N93/1) picks up the commands for controlling the functions within the MOST system, converts these into light pulses and with them actuates the necessary system components.
Operation and display possibilities on upper multifunction display (A1p13)
Readout:
- Set frequency band and possibly memory location number
- Name (only with radio data system transmitter) and frequency of station
- Information whether station search was accomplished via frequency or via stored station list
Operation:
- Volume
- Station search via station list or frequency, next station/ previous station
CD drive
Readout:
- Number of CD currently playing
- Number of CD track currently being played
Operation:
- Volume
- Select track (next/previous track)
Telephone
Readout:
- Request to enter PIN
- Name of provider
- Vehicle outside transmit or receive range of telephone network
- Telephone number (if stored) or name of caller (if also transferred via radio).
Operation:
- Volume
- Selection of name from stored phone directory, display of phone number and memory location number of party being called.
- Start making a call
- Accepting a call
- Dial repeat
- Reject or end call
| Audio gateway control module location/purpose/design/function | GF82.62-P-3102SK |
| Radio and navigation unit, location/purpose/ design/function | GF82.61-P-4109SK |