Stoplight Switch
WARNING: This page is about a different car, the 1995 Mazda MPV. However, it is still accessible from the selected car via links, so may be relevant.
Disconnect stoplight switch connector. Using ohmmeter, check continuity between stoplight switch connector terminals. With brake pedal depressed, continuity should exist. With brake pedal released, continuity should not exist. If continuity is not as specified, replace stoplight switch.