Mercedes-Benz SLR McLaren. Operator's Manual.

Safety and Security
Occupant safety
Front airbags
Driver and passenger airbags are deployed:
in the event of certain frontal impacts
if impact exceeds a preset deployment
threshold
independently of the head-thorax airbags
The airbags will not deploy in impacts
which do not exceed the system’s deployment
thresholds. You will then be protected
by the fastened seat belts.
The passenger airbag will only be deployed
if:
the passenger seat is occupied
the PASSENGER AIRBAG OFF indicator
lamp in the lower part of the center
console is not lit ( page 75)
the impact exceeds a preset deployment
threshold
68
1 Driver airbag
2 Passenger airbag
!
Do not place objects heavier than
20 lbs (9 kg) on the front passenger
seat. This could cause the front airbag,
the knee airbag or the head-thorax airbag
on the front passenger side to
deploy in a crash which exceeds the
system’s deployment threshold.
Knee airbags
1 Knee airbag, driver’s side
2 Knee airbag, passenger side
The kneebag airbags are located on the
lower instrument panel. They are designed
to operate together with the front airbags
in certain frontal impacts exceeding a
preset threshold. The knee airbags operate
best in conjunction with a properly
positioned and fastened seat belts and
when the footwell is kept clear of objects.