 If the system is not disarmed in the time window, it will warn the driver by sounding the vehicle's horn once every 10 seconds for 30 seconds, at which point the system will start sounding the horn at much shorter intervals and will usually activate the vehicle's hazard lights.At this point the immobiliser circuit will also start rapidly pulsing for 40 seconds, completely disabling the engine and eventually bringing the vehicle to a stop.If the thief switches the ignition to the "off" position and back to the "on" position again, the horn will restart and operate constantly and the hazard lights will flash for 60 seconds.