All FC3S turbo models in the U.S. have a keyhole light on the driver's side door lock.  This is usually not functioning due to water getting into the mechanism and rusting the wires leads or blowing the light.  Replacing this light from the Mazda dealer will require purchasing the entire outer door handle assembly and is not cost effective.  You can purchase small 12VDC lamps from Radio Shack or any number of online electronics parts stores (i.e. Parts Express) and replace just the light itself.  Handle microswitches can also be the culprit, and it's smart to test them to make sure they are working also.

The door lock light is supposed to trigger when you lift the outer door handle before unlocking the door itself.

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