Seat belt warning
The seat belt warning light always lights for 6 seconds when the ignition is switched ON. If the belt tongue is pressed into the buckle, the lamp goes out after these 6 seconds; if not, the lamp stays on.
On certain markets there is also an audible warning which is activated if any passenger has not fastened their seat belt when the ignition is ON. The audible warning is active for 6 seconds when the ignition is turned ON or until all seat belts are fastened.
The passenger seat is fitted with a sensor which detects when the seat is occupied. The resistance of the sensor varies depending on the load on the seat.