Bus Communication

- Control module, ACC (216)
- Radio connector C (267c)
- Airbag/SRS control module (331)
- Radio (353)
- CD changer (355)
- PSM control module (357Dk)
- Control module, Trionic T7 (430b)
- MIU (540d)
- SID(541)
- ABS control module (547)
- STC control module (565)
- Control module, Trionic T7 OBDII (589b)
- Control module, DICE (628)
- Control module, TWICE (632)

P-bus and I-bus

Sending:

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 the Powertrain bus (P-bus) and the Instrument bus (I-bus). Both buses are connected to the main instrument unit (MIU). The buses are electrically isolated from each other.

Data transfer is 10 times faster on the P-bus than on the I-bus.

All the information transmitted by one of the control modules is available to all the other control modules connected to the bus. MIU is responsible for making the information that is available on one bus also available on the other bus.

The control modules transmit information on the bus at regular intervals. The time between two transmissions depends on the information being sent and varies between 10 milliseconds (0.010 seconds) and one second. Information is also transmitted by the control modules each time the information changes.