Ford Fiesta (2011 year). Manual - part 77
Symptom Chart
Action
Possible Sources
Symptom
• CARRY OUT the Safety Belt
Component Test in this section.
• Safety belt retractor.
• Normal mode - occupant
restraint system inoperative.
Component 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.
The safety belts are “dual sensitive” which means
that they have:
• A vehicle motion sensor, which locks the safety
belt webbing under braking, cornering, on steep
hills and in adverse camber conditions.
• A webbing motion sensor, which locks when the
safety belt webbing is quickly extracted.
Both systems should be fully operational and can
be checked by the tests below:
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 driver and passenger 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 (6 mph). Do not
exceed 10 km/h (6 mph) 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 and rear
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.
• The driver should wear the safety belt provided
and the belt webbing must be correctly adjusted,
with no slack.
• The passenger should occupy a rear seat with
the safety belt 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 (10mph). Do not exceed 16
km/h (10 mph) 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.
G1055906en
501-20A-
4
Safety Belt System
501-20A-
4
DIAGNOSIS AND TESTING
201