Resistance Check
WARNING: This page is about a different car, the 2002 Nissan Sentra, 2002 Infiniti G20, 2001 Nissan Sentra, and 2001 Infiniti G20. However, it is still accessible from the selected car via links, so may be relevant.
Check continuity between overdrive switch harness connector terminals No. 1 and 2. See Fig 1. Continuity should exist with switch in OFF position. Continuity should not exist with switch in ON position. Replace switch as necessary.