Ford Mustang Owner's Manual page 19

This light tells you that the Transmission Control
Switch (TCS) has been pushed. When the light is
on, the transmission will not shift into overdrive.
Depressing the control will return the vehicle to
"overdrive on" mode. The transmission 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.
NOTE: 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. If this condition persists,
damage could occur to the
transmission.
High Beam Light
This light illuminates when the headlamps are
turned to high beam or when you flash the
lights.
The high beam light
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