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Brief Description, PSM system

Brief Description, PSM system

The PSM system (Power Seat Memory) is an integral part of the electrically adjustable driver's seat. PSM provides a memory function for the driver's seat that allows the programming of 3 different seat settings, which are then loaded automatically when the memory button concerned is held down.

An electrically adjusted driver's seat with PSM has a control module and a switch with four buttons; 3 memory buttons for programming and one store button to activate the memory.

Electrically adjustable door mirrors

The PMM system (Power Mirror Memory) enables setting the electrically adjustable door mirrors and storing the setting with the PSM function. The setting is stored in the PMM control module. The electrically adjustable door mirror and PMM are described in Group 8, ”Glass, windows and mirrors”.

P bus and I bus


In the Saab 9-5, all the car's control modules are connected to buses with the exception of the ABS and SRS control modules.

The buses are 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.

The P-bus has a data transfer rate ten times higher than that of the I-bus.

All information sent out on a bus by a control module is available to all other control modules connected to the bus. The MIU ensures that the information that is available on one bus is also available on the other.