Pedestrian Protection - Mercedes-Benz Series 176 Introduction Into Service Manual

Passive safety

Pedestrian protection

Load reduction in the event of a collision with
pedestrians or cyclists is of particular significance,
because these weaker road users do not have their
own crumple zones.
In addition to the active measures (for example the
standard Brake Assist), which help to avoid an acci-
dent or to minimize the severity of the accident, the
pedestrian protection measures for the new A-
Class have undergone further improvement.
To round off the overall safety concept for pedes-
trian protection the new A-Class is equipped with
an active engine hood. The deformation area
between the engine hood and the engine parts
concealed under it is increased by raising the
engine hood whereupon the injury risk during the
impact is minimized.
B151/1 Bumper pedestrian protection sensor, front left
B151/3 Bumper pedestrian protection sensor, front right
82 b Introduction of the New A-Class, Model Series 176
– This printout will not be recorded by the update service. Status: 06 / 2012 –
The active engine hood is triggered in the event of a
collision at a speed between 25 and 55 km/h.
Pedestrian protection sensors are installed in the
front bumper at the right and left and they are
connected to a hose. In the event of a frontal impact
the pressure rise in the hose is registered by the
sensors. The Supplemental Restraint System
control unit reads in the sensor data and actuates
the following actuators to raise the engine hood:
• Squib for active engine hood, left
• Squib for active engine hood, right
The status of the squibs for the active engine hood
is monitored by the Supplemental Restraint System
control unit.
R12/49 Squib for active engine hood, left
R12/50 Squib for active engine hood, right
P91.60-4388-00