Mercedes-Benz 350 SDL TURBO 1991 Owner's Manual page 41

D river Airbag
T he m ost effective occu pa nt restraint
system yet de velope d fo r use in
production veh icle s is the three -po int
seat belt. In som e cases, how ever,
the protective e ffect of sea t belts can
be further enhanced by an airbag.
The d rive r airbag (1) is located in the
steering w h ee l hub and, in con ju nction
w ith w e arin g th e sea t belts w ith
e m e rge ncy ten sio n in g retracto rs (2),
provides in crea sed pro te ction fo r the
driver.
T he opera tiona l rea diness of the
airbag system is verified by the
in dica tor lam p "S R S " (3) in the
in stru m en t cluster. If no fault is
de tected, th e lam p w ill go out after
ap p ro xim a te ly 4 seco nd s; after the
lam p go es out, the system continues
to m o n ito r the com p o n e n ts and
c ircu itry o f th e airbag system and will
in dica te a m alfunction by com ing on
again.
T h e fo llow ing system com p on ents are
m onitored o r undergo a self-check:
crash -sen sor, airbag ignition circuit,
d rive r and fro n t pa ssen ge r seat belt
buckles. Initially, w h en the key is
turne d from stee ring lock position 0 to
p o sitio ns 1 o r 2, m alfu nctio ns in the
c ra sh -s e n so r are de tected and
in dica ted (the "S R S " in dica tor lam p
stays on lo ng er than 4 seconds).
In the op era tiona l m ode, after the
in dica tor lam p has gone out follow ing
the initial check, in te rrup tions and
sho rt circu its in the airbag ignition
circu it and in the d rive r and front
p a ssen ge r sea t belt buckle harnes­
ses, and low volta ge in the entire
system are de tected and indicated.