Bus messages, Audio

/ 9-5 (9600) / 2009 / 3. Electrical System / Bus and diagnostics communication / Technical description / Bus messages, Audio

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 head unit uses the following information

Information	Value	From	The value is dependent on the following sensor input, signal or function
Ignition +B	ON/OFF	DICE	Ignition switch. The head unit uses the +B information only as logic voltage.
Key Correct	ON/OFF	TWICE	Immobilization function. The head unit uses the information for the audio system's theft protection function.
Vehicle speed	km/h, mph	MIU	RL wheel speed. The head unit uses the information for the function “Speed-dependent volume”.
Steering wheel controls	Arrow up, Arrow down, Vol +, Vol -, NXT, SRC	SID	The buttons' control module input. The head 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 head unit uses the information to control the brightness of the head unit's front lighting.
Rheostat Night Panel	0-100%	SID	Rheostat control module input is reduced with a fixed value. The head unit uses the information to control Night Panel light brightness on the head 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 head unit uses the information to control brightness on the head unit's front lighting.
Wheel speed	0-300 km/h	ESP	RL wheel speed sensor
Diagnostics communication		Tech 2	The control module must be live and the bus leads intact. For further information on the bus, see Bus and diagnostics communication. .

The head unit transmits the following information

Information	Value	Used by	The value is dependent on the following sensor input, signal or function
RDS time	Hours, Minutes, Seconds	SID control module	RDS reception. The SID uses the information for the internal clock.
RDS date	0-31	SID control module	RDS reception. The SID uses the information for the internal clock.
RDS month	January - December	SID control module	RDS reception. The SID uses the information for the internal clock.
Diagnostics communication	-	Tech 2	The control module must be live and the bus leads intact. For further information on the bus, see Bus and diagnostics communication.