Ford 1996 Crown Victoria Manual page 192

Driving
Your vehicle's gearshift is on the steering
column. The Transmission Control Switch (TCS)
is located on the end of the gearshift lever. The
Transmission Control Indicator Light (O/D OFF)
is located on the instrument panel. You can put
the gearshift lever in any of the several
positions.
The O/D OFF light is off (not illuminated)
during normal vehicle operation. This allows the
transmission to upshift and downshift from 1st
through 4th gears. When the TCS is pressed, the
Transmission Control Indicator Light will
illuminate (O/D OFF) on the instrument panel.
When this O/D OFF is illuminated the
transmission will upshift and downshift from 1st
through 3rd gears.
If the O/D OFF light does not come "on" when
the TCS is depressed or if the light "FLASHES"
when you are driving, have your vehicle
serviced at the first opportunity. If this condition
persists, damage could occur to the transmission.
To return the transmission to normal operation
(1st through 4th gear) depress the TCS again.
This switch may be used to cancel overdrive any
time the vehicle is being driven. Each time your
vehicle is started, the overdrive system will
automatically be in the normal overdrive mode
and the light will not be illuminated.
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