This section of IEC 839-10 specifies requirements and test methods for vehicle security alarm systems (VSAS) intended for installation within vehicles used for the carriage of passengers and having not more than eight seats in addition to the driver's seat. The object of the standard is to ensure a high standard of safety, performance and reliability of the VSAS and the reduction of false alarms. The standard covers VSAS designed to detect and signal the unauthorized opening of any of the vehicle doors, boot/luggage compartment, bonnet/engine hood and, in addition, to immobilize the vehicle when set. The standard covers VSAS intended both for installation as original equipment and for installation after delivery of the vehicle.