Turn the knurled ring to 
.
The warning light 
on the instrument
cluster will come on.
See also:
Advanced Front Air Bag Features
The Advanced Front Air Bag system provides output appropriate to the severity
and type of collision as determined by the Occupant Restraint Controller (ORC),
which may receive information from the ...
Right-hand direction indicator
The warning light on the dial turns on when the direction indicator control lever
is moved upwards or, together with the left indicator, when the hazard warning light
button is pressed. ...
Changing the battery
If required, replace the battery with a genuine spare part having the same specifications.
If a battery with different specifications is fitted, the service intervals given
in the “Service schedule ...