Remote control: Function
WARNING: This page is about a different car, the 2003 Saab 9-3. However, it is still accessible from the selected car via links, so may be relevant.
Point the car key at the car. Pressing a button will send a coded signal to the remote control that is received by the remote control receiver. The range is approx. 8 meters.
The signal from the remote control is a fixed identification code (each remote control has its own code) and a "rolling code" which is changed each time a button is pressed.