Ford Mystique Owner's Manual page 19

Instrumentation
Overdrive Off Indicator (Automatic Transaxle Only)
This light tells you that the Transaxle Control Switch (TCS) on
the gearshift lever has been pushed. When the light is on, the
transaxle will not shift into overdrive. Depressing the TCS
button located below the gearshift release button on the shifter
will return the vehicle to "overdrive on" mode. The transaxle
will be in the "overdrive on" mode when the vehicle is started
even if the O/D OFF mode was selected when the vehicle was
last shut off.
If the 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.
Turn Signal Indicator Lights
The turn signal arrow will flash to indicate the direction in
which you are going to be turning.
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