Abstract: A remote control transmitter configured to operate with a vehicle controller. The transmitter is operable in an active mode and a passive mode and/or in the alternative embodiment the transmitter is operable as a one-way or a two-way transmitter. The transmitter is configured to switch from one mode, such as the passive or two-way mode, to the other mode, such as active or one-way mode, in response to at least one of a user activated signal or a battery threshold signal.

Abstract: A vehicle security system comprising a controller and a plurality of authorized transmitters. The authorized transmitters configured to operate in a passive arm mode, wherein the transmitters transmit a periodic passive disarm signal to the controller. The disclosed embodiments teach a controller that arms in the presence of passive disarm signals and disarms upon receipt of an active disarm signal or upon detecting that a passive transmitter left the vicinity of the vehicle and subsequently returned.

Abstract: A remote control transmitter configured to operate with a vehicle controller. The transmitter is operable in an active mode and a passive mode. In the active mode the disarm/unlock command is sent by user activating a switch. In the passive mode the disarm/unlock command is automatically sent by the transmitter without the user having to activate any switches on the transmitter. The transmitter is configured to switch from the passive mode to the active mode in response to at least one of a user activated signal or a battery threshold signal.