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Brief description, central locking system

Brief description, central locking system

As standard, the Saab 9-5 is fitted with central locking system and, on all markets except US/CA, TSL (Theft Security Lock).

On the US/CA market, the car is fitted with separate unlocking of the driver's door as standard. This means that the driver's door can be unlocked separately first and then the other doors when the key is turned once more, when the remote control button is pressed once more or the switch in the centre console pressed once more.

Each door is fitted with a lock assembly with integrated electric motor. The central locking system is controlled by the TWICE control module. Locking/unlocking can be done with a key, the remote control or the button in the centre console.

When the TSL (Theft Security Lock) is activated, all the car locks are blocked so that the doors cannot be unlocked by pulling up the lock button in the door.

The central locking system cannot be activated from inside with the lock button in the driver's door, only with the button in the centre console.

The rear doors are fitted with child safety catches operated with a small knob by the door lock.

When locking/unlocking repeatedly, overheating protection is activated which prevents further locking, unlocking is still possible however.

The car is delivered with two keys/remote controls but a further two can be programmed making a total of four keys/remote controls to each car.

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 consist of a P bus (Powertrain Bus) and an I bus (Instrument Bus). Both buses are connected to the MIU (Main Instrument Unit). 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.