501-20A-4 Occupant Restraints — Active 501-20A-4
DIAGNOSIS AND TESTING
Safety Belt Testing
Functional Test
Poor Retraction
If a safety belt does not retract correctly, check
that the anchor covers and trim bezels are
correctly installed and not rubbing against the
safety belt webbing. Where necessary, check
that the safety belt webbing is not rubbing at one
end of the retractor cover slot and, if so, correct
by loosening the retaining bolt, aligning the
retractor to centralize the safety belt webbing and
retighten the bolt.
Both the vehicle motion sensor and the webbing
motion sensor should be fully operational and
can be checked by the following tests:
Vehicle Motion Sensor Test
Either of the following two procedures may be
used to check correct operation of the vehicle
motion sensor. Both methods require two
technicians but note that technicians of larger
than normal build should not be asked to conduct
these tests. This is to avoid the possibility of a
fully unrolled safety belt webbing being mistaken
for a correctly locked safety belt retractor.
Test Method 1 (braking)
WARNING: It is important that during this
test, the wearers allow the safety belts to
provide the restraint and do not attempt
to anticipate the sudden deceleration.
The steering wheel should not be used
as a brace. However, both driver and
passenger should prepare themselves
for the possibility that the safety belt will
not lock. The passenger should hold
their hands in front of them, just clear of
the instrument panel or front seat
backrest, depending on which safety belt
is being tested. Failure to follow these
instructions may result in personal
injury.
• Select for this test a quiet or private stretch of
road. Make sure that the road is clear and
that full visibility is maintained at all times.
• Both driver and passenger should adopt a
normal, comfortable seating position. Both
occupants should wear the safety belts and
the safety belt webbing must be correctly
adjusted, with no slack.
• Proceed at a speed of 10 km/h. Do not
exceed 10 km/h for this test.
• Apply the foot brake sharply to stop the
vehicle. If the vehicle motion sensitive lock
mechanism is operating correctly, the safety
belt webbing will lock and restrain the wearer.
• Conduct the test twice in each front
passenger seat position.
• Any safety belt retractor, which does not
restrain the wearer during this test, must not
be reused. A new safety belt must be
installed.
Test Method 2 (turning circle)
This method requires a flat open area of private
road, sufficient for the vehicle to be driven in a
continuous circle on full steering lock.
• Both driver and passenger should adopt a
normal, comfortable seating position. Both
occupants should wear the safety belts and
the safety belt webbing must be correctly
adjusted, with no slack.
• Start the engine and, with the steering on full
right-hand lock, drive the vehicle in a
continuous circle at 16 km/h. Do not exceed
16 km/h for this test.
• When the speed is stable, the passenger
should attempt to slowly extract the safety
belt webbing from each safety belt retractor in
turn. If the vehicle motion sensitive lock
mechanism is operating correctly, it will not
be possible to extract the webbing.
• Any safety belt retractor from which it is
possible to extract the webbing during this
test must not be used. A new safety belt must
be installed.
Component Test
With the vehicle stationary and on level ground
take firm hold of the safety belt webbing (on the
tongue side of the upper safety belt anchor) and
pull out quickly. The retractor should lock within
0.25 meter, preventing further webbing payout.
Any safety belt retractor from which it is possible
to extract further webbing must not be used. A
new safety belt must be installed.
08/2001 2002 Bantam
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