A keyfob has an electronic controller, a plurality of command inputs, a keyfob antenna and a feedback device. The plurality of command inputs, the keyfob antenna and the feedback device are in electronic communication with the controller. The controller is configured to send signals to a vehicle door lock system in response to operation one or more of the plurality of command inputs that instruct the vehicle door lock system to switch at least one door between a locked state and an unlocked state. The controller is further configured to enter a diagnostic mode in response to a predetermined operation of the plurality of command inputs such that in the diagnostic mode the keyfob operates as a diagnostic tool that detects an operating state of at least one of the keyfob and the vehicle door lock system.