9-5 Wagon (9600) L4-2.3L Turbo (B235) (1999)
Courtesy lights in the doors. Turn on and off automatically when a car door is opened and closed.
Luggage compartment illumination 4D
Light in the luggage compartment. Turns on and off automatically when the lid is opened and closed.
Luggage compartment illumination 5D
Light in luggage compartment. Automatically turned on and off when the tailgate is opened or closed respectively. When the tailgate is opened, the lamp
shines red to the rear and white downwards.
Lighting for buttons and controls
For dimming instrument and control lighting. The light intensity is controlled manually with a potentiometer connected to SID.
Information on the potentiometer is output to the bus.
Bus Communication
P-bus and I-bus
All the control modules in the Saab 9-5 are connected to the bus except those for the ABS and SRS.
The bus is divided into a Powertrain bus (P-bus) and an Instrument bus (I-bus). Both buses are connected to the main instrument unit (MIU). The buses
have separate electrical systems.
The data transfer rate 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 other control modules on the bus. The MIU is responsible for ensuring that
information available on one bus is also available on the other bus.