Stoplight Switch
WARNING: This page is about a different car, the 1995 Mazda MX-3. However, it is still accessible from the selected car via links, so may be relevant.
Disconnect stoplight switch connectors. Using ohmmeter, check continuity between stoplight switch terminals. See Fig 1 . With brake pedal depressed, continuity should only exist between terminals "C" and "D". With brake pedal released, continuity should only exist between terminals "A" and "B". If continuity is not as specified, replace stoplight switch.