Overdrive Switch
WARNING: This page is about a different car, the 2002 Infiniti QX4, 2001 Nissan Pathfinder, and 2001 Infiniti QX4. However, it is still accessible from the selected car via links, so may be relevant.
Check for continuity between switch terminals on overdrive switch harness connector. See Fig 1. Continuity should exist with switch in OFF position. Continuity should not exist with switch in ON position. Replace switch as necessary.