Turn the knurled ring to 
.
The warning light 
on the instrument
cluster will come on.
See also:
Chassis
...
Climatic comfort
Knob (D) directs the air inside the passenger compartment according to five levels:
air flow from central vents and
side outlets;
to warm the feet and keep the face
cool (“bilevel” function)
...
Supplemental Seat-Mounted Side Air Bags (SAB)
Supplemental Seat-Mounted Side Air Bags (SAB) provide enhanced protection to
help protect an occupant during a side impact. The SAB are marked with an air bag
label sewn into the outboard side of ...