Overdrive Off Switch
WARNING: This page is about a different car, the 2002 Mazda 626 and 2001 Mazda 626. However, it is still accessible from the selected car via links, so may be relevant.
An Overdrive OFF (O/D OFF) switch is mounted on gearshift lever. When O/D OFF switch is released to ON position, transaxle will shift into 4th gear when gearshift lever is in "D" position. O/D OFF light on instrument cluster should not be illuminated. When O/D OFF switch is depressed to OFF position, transaxle will not shift into 4th gear and O/D OFF light will be illuminated.