O/D Off Switch: Inspection
Remove rear center console. Turn ignition on. Backprobing O/D OFF switch connector, measure voltage between terminals "B" and "D". See Fig 1 . See WIRING DIAGRAMS . Battery voltage should only be present with button released. Repair circuits as needed.
Turn ignition off. Disconnect O/D OFF switch connector. Check for continuity between terminals "B" and "D". Continuity should only exist with button depressed. Replace switch as needed.