An aftermarket telematics unit for use with a vehicle includes, but is not limited to, a housing that is configured for mounting in an interior of a vehicle, a receiver mounted within the housing and configured to receive a first short range wireless signal at a first frequency, a fob component mounted within the housing and configured to transmit a second short range wireless signal at a second frequency, and a controller mounted within the housing and coupled to the wireless receiver and the fob component. The controller is configured to provide instructions to the fob component to transmit the second short range wireless signal when the wireless receiver receives the first short range wireless signal.