BMW 3 (E46). Manual — part 297
with a luke-warm soap solution
only.
Seat belts should be
periodically inspected for
webbing defects such as cuts or
pulled threads.
Immediately after replacing a
damaged or worn seat belt,
destroy the old belt to prevent it
from being used again.
Table a. Troubleshooting the automatic seat belt system
Problem
Probable cause
Repairs
Damage to seat belt:
Accident in which bumper
impact absorbers were
permanently deformed
Replace complete automatic
seat belt. Also check and
replace, if necessary:
Seat belt mounting on
car body
Seat belt mounting on
seat runner
Belt creased, unraveled,
pinched, cut or melted
Seat belts aged or worn
Replace complete automatic
seat belt.
Belt buckle or belt lock plastic
casing worn, damaged or
missing
Seat belt buckle is not ejected
with spring pressure when red
button on seat belt lock is
pressed
Seat belt lock mechanism
worn or damaged
Replace seat belt lock.
Seat belt automatic reel does
not lock when pulled out
suddenly.
Automatic reel defective
Replace reel assembly.
Seat belt automatic reel jams
when pulled out.
Automatic reel loose
Tighten reel mounting bolt.
Return spring broken inside
reel
Replace reel assembly.
Problem
Probable cause
Repairs
Seat belt does not retract
automatically. (See note.)
Automatic reel loose
Tighten reel mounting bolt.
Return spring broken inside
reel
Replace reel assembly.
Automatic belt squeaks when
belt fastened or unfastened.
Excessive friction in belt
guides
Replace reel assembly.
Automatic reel loose
Tighten reel mounting bolt.
Return spring broken inside
reel
Replace reel assembly.
Seat belt pyrotechnic
tensioner triggered
Accident triggered
pyrotechnic deployment
Replace complete automatic
seat belt. Also check
retaining bracket of belt
tensioner for twist.
Convertible models only:
Front seat back requires
excessive force to lock or
unlock
Accident damage to seat via
seat belt
Replace front seat.
Seat back lock warning lamp
on when seat back is locked;
or warning lamp lights up
when seat back is shaken
Seat back lock microswitch
defective
Replace microswitch
Microswitch electrical harness
connectors loose or defective
Repair electrical leads.
Seat back lock is damaged
If fault persists, replace front
seat.
Contact surface of inertia reel
warped
Accident damage
Replace front seat.
Seat back warped or
deformed
Accident damage
Head restraint carrier not
parallel
Accident damage
Seat movement sticky or
sluggish at some point in its
range; unusual noises
Accident damage (side)
Front seat shows evidence of
contact with body structural
part (e.g., door)
Accident damage (side)
Front seat shows evidence of
contact with external objects
Accident damage (rollover)
720-2
Front Seat Belt
Assembly
Front seat belt tensioner,
removing and installing
The front seat belt locks are equipped
with pyrotechnic (explosive charge)
automatic tensioners. These tensioners
are designed to automatically retract
and tension the seat belt by 55 mm
(approximately 2 inches) in the event of
an accident.
WARNING!
Pyrotechnic seat belt tensioners
are powerful devices and should
be handled with extreme care.
Incorrect handling can trigger
the tensioner and cause injury.
BMW recommends that all repair
or replacement work on
pyrotechnic devices must be
carried out by a qualified BMW
technician.
Be sure to disconnect the
battery and wait 5 seconds
before attempting to work on
pyrotechnic devices.
Pyrotechnic devices cannot be
repaired. Always replace them.
Never treat pyrotechnic
components with cleaning
agents or grease.
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