Stoplight Switch (Harness Test)
WARNING: This page is about a different car, the 1994 Mazda MX-3. However, it is still accessible from the selected car via links, so may be relevant.
Turn ignition off. Disconnect ABS control unit 12-pin connector. Turn ignition on. Check voltage between ABS control unit (vehicle harness side) connector terminal 1M (Green wire) and ground. See Figure . If voltage is not as specified, check wiring harness between stoplight switch and ABS control unit.