Neutral Switch
WARNING: This page is about a different car, the 1994 Mazda MX-6 and 1994 Mazda 626. However, it is still accessible from the selected car via links, so may be relevant.
Disconnect neutral switch electrical connector. Using ohmmeter, check continuity between switch terminals. Ensure continuity exists with transmission in Neutral. Continuity should not exist with transmission in any other gear. Replace switch as necessary.