Abstract: A vehicle security system and methods for triggering alarms, including a controller responsive to entry of a security code via the keypad which matches a particular security code to disengage an starter blocking relay. The controller is further responsive to determining that the ignition switch is turned to the "on" position without prior entry of a matching security code to start a timer which times out after a predetermined period of time, whereby in response to non-entry of a matching security code before expiration of the predetermined period of time, the controller generates an alarm signal for transmission via the wireless transceiver to a central monitoring station. If the controller determines that the ignition switch is turned to its off position after the timer is started, it disengages the starter blocking relay so as to enable ignition of the vehicle.