Bus Message, Audio Navigation System

WARNING: This page is about a different car, the 2007 Saab 9-5. However, it is still accessible from the selected car via links, so may be relevant.

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

VALUE INFORMATION CHART

Information	Value	Off	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.
CD changer information	Current settings	CDC	Information on current CD and its location.
Vehicle speed	km/h, mph	MIU	RL wheel speed. The head 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 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 head unit uses the information to activate or deactivate "Night Panel". When activated, the light intensity of the head unit illumination is reduced and the touchscreen turned off.
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	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 head unit transmits the following information

VALUE INFORMATION CHART

Information	Value	Used by	The value is dependent on the following sensor input, signal or function
GPS time	Hours, Minutes, Seconds	SID	GPS reception. The SID uses the information for the time function (clock).
GPS date	0-31	SID	GPS reception. The SID uses the information for the time function (clock).
GPS month	January - December	SID	GPS reception. The SID uses the information for the time function (clock).
CD changer control	Information for controlling the CD changer	CDC	Buttons on the panel. The CD changer uses the information from the head 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 .