System Overview (DICE)

System Overview, DICE

- Exterior lighting.
- Interior lighting.
- Button illumination and lighting for controls.
- Intermittent wipers, windscreen.
- Electrically heated rear window and door mirrors.
- Radiator fan system.
- A/C function.

DICE is a comprehensive control system for the electronic functions in the car. The central unit in DICE is a control module which communicates With the system units and with other systems via the car's wiring and the instrument bus (I bus). DICE has its own diagnostics function and diagnostic trouble codes are set when faults arise.

The following functions are controlled by DICE:
- Exterior lighting
- Interior Light
- Rheostat control
- Acoustic warning
- Intermittent wiper, windscreen
- Electrically heated rear window and door mirrors
- Radiator fan
- Air conditioning

Exterior lighting
The car's exterior lighting is operated with the main lights switch and the left-hand toggle switch combined with the DICE control module.

The following light functions in the car's exterior lighting system are controlled by DICE:
- Headlamps
- Front fog lights
- Rear fog lights
- Direction indicators
- Hazard flashers

Interior lighting system
General interior lighting (dome lamps) in the car. Automatic or manual function depending on the position of the lights switch.

The following light functions in the interior lighting system are controlled by DICE:
- Cabin lighting
- Map Light
- Vanity mirror light
- Glove box light
- Floor light
- Courtesy lights
- Luggage compartment lighting

Rheostat control
For dimming instrument and control lighting. Brightness is regulated manually (continuous) with a potentiometer.

Acoustic warning
Acoustic warning if the driver's door is opened while the key is still in the ignition.
Acoustic warning if the parking lights are on and the driver's door is opened while the key is not in the ignition.
The function is programmable.

Intermittent wipers
Intermittent wiper function for the windscreen. Operated manually with or without washing with the toggle switch (wiper switch).

Electrically heated rear window and door mirrors
For heating the rear window and door mirrors.
Operated manually or automatically via the car's ACC function.

Radiator fan
Radiator fan system control (single/double radiator fan).

Air conditioning
A/C control.





P bus and I bus
All the control modules in the Saab 9-5 are connected to the bus with the exception of ABS and SRS.
The bus is divided into a Power train bus (P bus) and an Instrument bus (I bus). Both busses are connected to the main instrument display panel (MIU). The busses have separate electrical systems.
Data transmission on the P bus is ten times faster than on the I bus.
All the information sent from one control module is accessible for all the other control modules on the bus. The MIU is responsible for making information on one bus available to the other bus.