When the knurled ring is at 
push
the lever towards the dashboard (stable position).
The warning light 
on the instrument
cluster will come on.
Pulling the lever towards the steering wheel again, the main beams are turned off and the dipped beams on.
See also:
Tread Wear Indicators
Tread wear indicators are in the original equipment tires to help you in determining
when your tires should be replaced.
1 — Worn Tire
2 — New Tire
These indicators are molded into the bottom o ...
Failure warning lights
Any failure is indicated by cluster warning light
coming on together with the message
on the reconfigurable multifunction display (where required) (see section “Warning
lights and messages”). In ...
Rear window and door mirror demisting/defrosting
Press to turn this function on.
Activation is indicated by the turning on of the warning light
on the instrument panel.
This function is timed and switches off automatically after 30 minutes. To ...