Troubleshooting - BMW 5251 Service Manual

I
Seat
Belts
This section covers repairs to the following seat belts sys-
tems. See the table below.
IMultIple Restraint Systems
I
Years
311 996 - 811 997
Multiple Restraint System electronics integrate seat belt op-
erations and airbag deployment. Airbag repair information is
covered
in
721
A i r b a g
System (SRS).
Troubleshooting
T h e seat belt reel should lock when driving quicltly through
curves,
during
severe braking or
in
case of
a
collision. T h e au-
tomatic reel does not require any servicing and should never
b e opened.
-
In
case of
an
accident, follow the seat belt troubleshooting
procedures presented
in
the table below.
Troubleshooting procedures
Belt creased, unraveled, pinched, cut or
melted. Belt buckle or belt loclt plastic casing
Repairs
Replace complete automatic seat belt.
Also checlt and replace, if necessary, seat
Problem
Damage to seat belt.
worn, damaged or missing.
Seat belt bucltle is not ejected with spring
pressure when red button on seat belt loclt is
> - - -
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I
Automatic belt soueaks when fastened or
I~xcessive friction in belt guides.
I
Replace reel assembly.
Probable cause
Accident in which bumper impact absorbers
were permanently deformed.
Seat belts aged or worn.
pressed.
Seat belt automatic reel does not lock when
pulled out suddenly.
Seat belt automatic reel jams when pulled
out.
Seat belt does not retract automatically
(see note below).
Automatic reel loose.
Return sorino broken inside reel.
belt mounting on car body and seat belt
mounting on seat runner.
Replace complete automatic seat belt.
Seat belt loclt mechanism worn or
damaged.
Tighten reel mounting bolt
Replace reel assembly.
Replace seat belt lock.
Automatic reel defective.
Automatic reel loose.
Return spring broken inside reel.
Automatic reel loose.
Return spring brolten inside reel.
Replace reel assembly.
Tighten reel mounting bolt.
Replace reel assembly.
Tighten reel mounting bolt.
Replace reel assembly.
~
~-~~
,
-
I '
Replace complete automatic seat belt.
Also check retaining bracket of belt
Seat belt pyrotechnic tensioner triggered.
Accident triggered pyrotechnic deployment.