Durango 2WD V8-5.2L VIN Y (1999)
Overdrive Switch: Description and Operation
OVERDRIVE/OVERRIDE SWITCH-PCM INPUT
On vehicles equipped with an automatic transmission and overdrive, the powertrain control module (PCM) regulates the 3-4 overdrive up-shift and
downshift through the overdrive solenoid. This solenoid is located in the transmission. An overdrive/override push-button switch is located at the
end of transmission shift lever.
The overdrive/override push-button switch is normally open (overdrive allowed) when the lamp is not illuminated. It momentarily closes
(overdrive not allowed) when the operator presses the switch and the lamp is illuminated. Overdrive will revert to ON (lamp off) each time the
ignition switch in turned on. The transmission downshifts if the operator presses the override switch while in overdrive.
