SWITCH-OVERDRIVE
DESCRIPTION
The overdrive OFF (control) switch is located in the shifter handle. The switch is a momentary contact device that
signals the PCM to toggle current status of the overdrive function.
OPERATION
At key-on, fourth gear operation is allowed. Pressing the switch once causes the overdrive OFF mode to be entered
and the overdrive OFF switch lamp to be illuminated. Pressing the switch a second time causes normal overdrive
operation to be restored and the overdrive lamp to be turned off. The overdrive OFF mode defaults to ON after the
ignition switch is cycled OFF and ON. The normal position for the control switch is the ON position. The switch must
be in this position to energize the solenoids and allow upshifts to fourth gear. The control switch indicator light illu-
minates only when the overdrive switch is turned to the OFF position, or when illuminated by the transmission con-
trol module.
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AUTOMATIC TRANSMISSION - 545RFE
KJ