The warning light on the dial comes on (on certain versions together with the message on the display) when the "Follow me home" device is activated (see "Follow me home" in the "Dashboard and controls" section).
See also:
Rear Window Features
Rear Window Defroster
The rear window defroster button is located in the center of the instrument panel,
below the radio.
Press this button to turn on the rear window defroster.
An indicator in ...
Rear foglights
The warning light on the dial turns on when the rear fog lights are turned on. ...
Speed limit exceeded
The warning light on the dial turns on (on certain versions together with the
message on the display) when the car exceeds the speed limit set previously (see
“Reconfigurable multifunction dis ...