Mercedes-Benz 300D 2.5 1990 Owner's Manual page 43

SUPPLEMENTAL RESTRAINT
SYSTEM (SRS)
Emergency Tensioning
Retractor (ETR)
The seat belts for the front seats are
equipped with emergency tensioning
retractors. These tensioning retractors
are located in each belt's inertia reel
and become operationally ready with
the key in steering lock position 1 or 2.
The emergency tensioning retractors
are designed to activate only when the
seat belts are fastened during major
frontal impacts within the shaded area
shown. They tighten the belts in such
a way that they fit more snugly against
the body restricting its forward move­
ment as much as possible.
In cases of less severe frontal impacts
roll-overs, certain side impacts, rear
collisions, or other accidents without
major frontal forces, the emergency
tensioning retractors will not be
activated. The driver and passengers
will then be protected by the fastened
seat belts and intertia reel in the usual
manner.
For seat belt and emergency tension­
ing retractor safety guidelines see
page 45.
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