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Brief description, central locking system

Brief description, central locking system


Saab 9-3 is standard equipped with central locking system for all markets. In certain markets, the cars are also standard equipped with TSL - Theft Security Lock.

In each door there is a lock unit, which in the front doors consist of a lock cylinder, microswitch, electric motor and lock. The function of the central lock is controlled by the TWICE control module. Locking/unlocking is possible with the key, remote control or the button on the centre console. The central locking system cannot be controlled with the remote control when the key is in the ignition.

The central locks can be operated both from the driver's door and the passenger door. The lock has a freely rotating lock cylinder, which means that the cylinder rotates if the correct key is not used or if someone tries to break into the car.

The central locks cannot be locked from the inside with a lock button in the driver's door, only with the button on the centre console. The lock buttons on the doors lock and unlock each respective door. The convertible is constructed without lock button on the centre console, instead the central lock can be operated with the lock buttons in the doors.

The car is delivered with two keys and two remote controls, however, another two can be programmed which means a maximum of four keys/remote controls for each car. In addition, a key element is supplied and is intended for use as a spare key for the central locking system. This key has no transponder so the car cannot be started with this key.

When TSL (Theft Security Lock) is activated, all locks in the car are blocked and it is not possible to unlock the doors with the lock button in the door or on the centre console. TSL cannot be activated when a door is ajar.

For the US and CA markets, the cars are equipped with separate unlocking of the driver's door as standard. The separate unlocking feature means that the door is first unlocked separately and the remaining doors are unlocked when the key is turned a second time (also passenger door with key), when the button on the remote control is pressed a second time, and when the button on the centre console is activated a second time.

If the central locking system is TSL-locked with the remote control or key (locked from the outside), the central locking system will unlock when the key is inserted into the ignition and turned to ON and the correct immobilisation code has been identified. This is a safety function to prevent someone from driving off in a TSL-locked car.

P bus and I bus


In the Saab 9-3, a smaller number of the control modules are connected to one of the bus systems when comparing to the Saab 9-5.

The two bus systems are I-bus (instrument bus) and P-bus (Powertrain bus).

Both buses are connected to the main instrument (MIU). The buses are electrically isolated from each other.

The P-bus has a communication speed ten times faster than that of the I-bus.

All information sent out by a control module is available to all control modules connected to a bus. MIU is responsible for making sure that information available on one bus also is available on the other bus.