Bus messages, Audio

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Bus messages, Audio

For a further description of the car's bus system, see System overview, bus and diagnostics communication, petrol and System overview, bus and diagnostics communication, diesel .

The main unit uses the following information

Information	Values	Off	The value depends on the following sensor input, signal or function
Ignition +B	ON/OFF	DICE	Ignition switch. The main unit uses the +B information only as logic voltage.
Key Correct	ON/OFF	TWICE	Immobilization function. The main unit uses the information for the audio system's theft protection function.
CD changer information	Current settings	CDC	Information on current CD and its location.
Vehicle speed	km/h, mph	MIU	RL wheel speed. The main unit uses the information for the function “Speed-dependent volume”.
Steering wheel controls	Seek >>, Seek <<, Vol +, Vol -, NXT, SRC	SID	The buttons' control module input. The main unit uses the information to control the function (perform the command) selected with the steering wheel switches.
Rheostat level	0-100%	SID	Rheostat control module input. The main unit uses the information to control the brightness of the main unit's front lighting.
Rheostat Night Panel	0-100%	SID	Rheostat control module input is reduced with a fixed value. The main unit uses the information to control Night Panel light brightness on the main unit's front lighting.
Night Panel	ON/OFF	SID	Button. The main unit uses the information to switch on/off the “Night Panel” function. When switched on, brightness on the main unit's front lighting is reduced.
Display lighting	0-100%	SID	Rheostat control module input or light sensor, highest value. The main unit uses the information to control brightness on the main unit's front lighting.
Wheel speed	0-300 km/h	TC/ABS	RL wheel speed sensor
Diagnostics communication		DICE	The control module must be live and the bus leads intact. For further information on the bus, see Bus and diagnostics communication. .

The main unit transmits the following information

Information	Values	Used by	The value depends on the following sensor input, signal or function
RDS time	Hours, Minutes, Seconds	SID	RDS reception. SID uses the information in the time function (clock).
RDS date	0-31	SID	RDS reception. SID uses the information in the time function (clock).
RDS month	January - December	SID	RDS reception. SID uses the information in the time function (clock).
Sound	Sound information	SID	Button pressing on the panel. SID uses this information to activate the requested type of sound from the main unit.
Text message	Text information	SID	SID uses the information to show on the display the setting of the source currently in use.
CD changer control	Information for controlling the CD changer	CDC	Buttons on the panel. The CD changer uses the information from the main unit to control the selected function of the CD changer.
Diagnostics communication	-	DICE	The control module must be live and the bus leads intact. For further information on the bus, see Bus and diagnostics communication.