US Patent 10002535 Dual-stage car finder

A vehicle location system includes a vehicle-based communication unit having a processor. The processor is configured to analyze request signals from a portable communication device. A first audible output device is configured to generate a first audible sound. A second audible output device is configured to generate a second audible sound. The sound generated by the second audible output device is a greater sound pressure than the first audible output device. The processor selectively enables one of the first audible output device and second audible output device based on the processor comparing a proximity characteristic of the request signals to a predetermined threshold.