The warning light on the dial comes on when a failure is detected.
See also:
Windscreen/rear window/headlight washer fluid
To top up, remove the cap (A) and then pour a mixture of water and TUTELA PROFESSIONAL
SC 35, in the following concentrations:
❒ 30% TUTELA PROFESSIONAL SC 35 and 70% water in summer;
...
Rear foglights
The warning light on the dial turns on when the rear fog lights are turned on. ...
Sidelights and low beams
The warning light on the dial turns on when sidelights, parking lights or low
beams are turned on. ...