Sensor System; Top Tether - Mercedes-Benz GLK-Class Service Manual

Safety
Restraint system, sensor system and PRE-SAFE
Supplemental Restraint System (SRS) and

sensor system

The SRS installed in the GLK, which also takes
prospective safety-relevant developments into
account, consists of the central airbag control unit and
the following sensors:
• Two upfront sensors on the flexural member
• Two satellite sensors near the bottom of the
B-pillars
• Pressure sensors in the front and rear doors
• Triggering of the driver and front passenger airbags
• Front side airbags
• Pelvis airbags
• Window airbags
• Knee airbag
• Emergency tensioning retractor
• NECK-PRO head restraints
• Seat belt buckle switches (record the belt status
on all seats)
• Acoustic and visual seat belt reminder warning
(for driver and front passenger seat)
• Status of front seats (displayed on instrument
cluster)
• Activation of the pyrofuse
• Door release
• Window lowering by 50 mm, front
• Hazard warning flasher
• Engine shutoff und and fuel pump cutoff
• Crash-active emergency illumination

Top Tether

The Top Tether system provides the option of making
an additional connection between child restraint
systems attached using ISOFIX and the rear seat
This can reduce the risk of injury even further. The Top
Tether anchorings are fixed to the rear of the backrests.
40 v Introduction of the New GLK-Class (USA), Introduction into Service Manual for Model Series 204
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PRE-SAFE system
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The PRE-SAFE system breaches the gap between
active and passive safety. It uses the sensor systems
of dynamic driving control systems such as BAS and
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ESP and, based on the information obtained, can
detect dynamic driving situations and critical situa-
tions where there is an increased risk of accident. In
this type of situation, the time remaining until a (prob-
able) impact is used to activate preventive protection
systems. This reduces the risk and further improves
occupant protection.
Trigger mechanisms of the PRE-SAFE
• Emergency stops
• Panic follow-up braking
• Severe oversteer
• Severe understeer
• Critical steering movements at high speed
(> 140 km / h)
Safety measures
Depending on the driving situation and vehicle equip-
ment, the following measures can be implemented to
improve occupant protection:
• Motorized seat belt tensioning for the driver and
front passenger
• Positioning of front passenger seat in the most
favorable position for an impact (vehicles with SA
memory seat adjustment)
• Closing of front and rear side windows and
panoramic sliding sunroof (SA) down to a
remaining gap of 50 mm when there is a high risk
of a rollover
If an accident is avoided, the front belts are relaxed
again when the vehicle is back inside the critical limits.
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system: