Vehicle security system having transmitter learning and feature programming based on a single-digit user code and related methods

A vehicle security system includes a transmitter to be carried by a user, and a controller at the vehicle for performing at least one vehicle function responsive to the transmitter. The controller is switchable among a plurality of modes, including a transmitter learning mode and a feature programming mode. A switch, such as a depressable momentary contact switch, is preferably at the vehicle and cooperates with the controller for switching the controller to the transmitter learning mode for learning at least one new uniquely coded transmitter responsive to activations of the switch a plurality of times in a sequence corresponding to a single-digit user code. To place the controller in the feature programming mode, the switch also cooperates with the controller for switching the controller to the feature programming mode for permitting programming of selectable features responsive to activations of the switch a plurality of times in a sequence corresponding to the single-digit user code.