Messages will be shown on the display when range falls below 50 km.
See also:
29. Speedometer
The Speedometer shows the vehicle speed in miles per hour (mph) and/or kilometers
per hour (km/h). ...
Speedometer
The speedometer A-fig. 31 - 32 shows the vehicle speed.
...
General failure indication
The warning light on the dial comes on when a failure is detected. ...