Overdrive Switch

OD switch (mounted on shift lever) provides an input signal to PCM to indicate when overdrive is selected by vehicle operator. When OD switch is depressed to ON position with shift lever in "D" range, transmission will upshift into 4th gear, and OD/OFF indicator on instrument panel will go off. When OD switch is released to OFF position, transmission will downshift into 3rd gear, and OD/OFF indicator will illuminate.