Mercedes-Benz SLR McLaren. Operator's Manual.

Safety and Security
Occupant safety
66
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Airbags are designed to activate only in
certain frontal impacts (front airbags,
knee airbags) and side impacts
(head-thorax airbags) which exceed
preset thresholds. Only during these
types of impacts, if of sufficient severity
to meet the deployment threshold,
will they provide their supplemental
protection.
The driver and passengers should always
wear their seat belts. Otherwise it
is not possible for the airbags to provide
their intended supplemental protection.
In cases of other frontal impacts, angled
impacts, roll-overs, other side impacts,
rear collisions, or other
accidents and impacts below airbag
deployment thresholds, the airbags will
not be activated. The driver and passenger
will then be protected to the extent
possible by a properly fastened
seat belt.
We caution you not to rely on the presence
of the airbags in order to avoid
wearing your seat belt.
Your vehicle was originally equipped
with airbags which are designed to activate
in certain impacts exceeding a
preset threshold to reduce the potential
and severity of injury. It is important
to your safety and that of your passenger
that you replace deployed airbags
and repair any malfunctioning airbags
to ensure that the vehicle will continue
to provide supplemental crash protection
for occupants.