Keyless entry system for locking and unlocking a vehicular lock device

Abstract

A keyless entry system for operating a vehicular door lock device between a first door locking position and a second door unlocking position. The system has an electrically drivable actuator associated with the vehicular device for operating the latter between the first and second positions, a radio signal transmitter of a size equivalent to a credit-card, and being triggerrable by a trigger command and generating a radio code signal containing a preset identification code, the radio signal transmitter having a first antenna. The system also has a manually operable trigger switch mounted on a vehicle body and exposed to the outside of the vehicle body so that it is accessible from the outside of the vehicle, a controller connected to the actuator and the trigger switch and responsive to manual operation of the trigger switch to generate the trigger command, the controller receiving the radio code signal to compare the identification code with a preset authorized transmitter indicative code to output a control signal to the actuator for controlling the operation of the latter when the identification code matches the authorized transmitter indicative code. The keyless entry system employs an arrangement installing the second antenna within an internal space defined in a vehicular constructional body panel or door.