Mercedes-Benz 350 SDL TURBO 1991 Owner's Manual page 40

S U P P L E M E N T A L R E S T R A IN T
S Y S T E M (SR S)
T he S R S uses tw o crash severity
levels (thresholds) to activa te eith er
the ETR or airbag or both. A ctivation
depe nd s on exce ed ing the th resh olds
and fasten ing of the seat belt.
Seat belt fastened
• first thresh old exceeded:
ETR activates
• second thresh old exceeded:
airbag also activates
38
S eat belt not fastened
• first thresh old exceeded:
airbag activa tes, but not ETR
D river and front p a ssen ge r system s
o p era te in de p e n d e n tly from each
other.
E m e rg en cy T en sio n in g R etractor
(ETR )
T he seat belts fo r the fro n t seats are
equippe d w ith em e rge ncy ten sion ing
retractors. T h e se ten sio n in g retracto rs
are located in each b e lt's in ertia reel
and becom e o p e ra tiona lly ready w ith
the key in steering lock position 1 or 2.
T he em e rge ncy ten sion ing retractors
are desig ned to a ctiva te only w hen
the seat belts are fasten ed during
fronta l and fronta ngled im pacts
exce ed ing the first threh old of the
SRS. T hey rem ove sla ck from the
belts in such a w a y th a t the seat belts
fit m ore snu gly ag ainst the body
restrictin g its forw a rd m ove m en t as
m uch as possible.
In case s of o th e r fronta l im pacts, roll­
overs, certain side im pacts, rear
collisions, or oth er a ccide nts w ithout
frontal forces, the e m e rge ncy te n s io ­
ning retracto rs w ill not be activated.
T h e d rive r and pa ssen ge rs w ill then
be protected by the fasten ed seat
belts and in ertia reel in the usual
m anner.
For seat belt and em e rge ncy te n sio n ­
ing retracto r safety guidelines, see
page 42.