Overdrive Main Switch
WARNING: This page does not describe the selected car, but rather 11 other vehicles, including the 1992 Geo Prizm, 1991 Toyota MR2, 1991 Toyota Corolla, 1991 Geo Prizm, and 1990 Toyota Corolla. However, it is still accessible from the selected car via links, so may be relevant.
Using an ohmmeter, check for continuity between switch terminals No. 1 and No. 3, while switching to ON and OFF position. See Figure. Continuity should exist with switch turned to OFF position. Continuity should not exist with switch turned to ON position. Replace switch as necessary.