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The seat slide sensor is attached to the slide
adjuster on the driver's seat side, and the seat
is moved forward/backward by seat sliding.
When the seat is slid forward, the shield plate
covers the sensor, and the sensor determines
that the seat slide position is set forward.
The seat slide sensor outputs the current by
switching high output current and low output
current from the seat slide position as shown in
the figure. Based on the output current, SRS-
ECU determines the deployment stage of the
front air bag, and then energizes the squib.
When the shield plate is in the detection
range of the seat slide sensor
When the shield plate is not in the detection
range of the seat slide sensor
SEAT BELT WITH
PRE-TENSIONER
The seat belt incorporating the pre-tensioner
automatically winds the seatbelt upon front
impact or rollover to reduce forward or upward
shifting of the passenger
The seat belt pre-tensioner ignites the gas
generator and emits gas with the electric
current supplied from SRS-ECU. The gas
pressure moves the ball in the pipe until it
contacts the protrusion on the ring gear. This
will press in the ring gear and then the ring
gear will be engaged in the pinion. As the ring
gear rotates, the pinion rotates the spool to the
direction where it will be retracted.
The lap pre-tensioner automatically pulls in the
seat belt upon a frontal collision to reduce the
forward travel distance of occupants.
Upon a collision, when the front impact sensor,
attached to the front of the vehicle body,
detects an impact that exceeds the permissible
limit, the lap pre-tensioner ignites the gas
generator with the signal from SRS-ECU, and
the generator emits the gas.
By the gas pressure, the wire linked to the
piston travels in the direction of movement,
then the seat belt is pulled in. Subsequently,
when a tension is applied to the seat belt by
the forward travel of an occupant, balls are
jammed between the piston and tube because
of the wedge action, and the drawing position
is maintained due to the locking.
Seat
belt
WireBall
Tube
Piston
movement
Piston
Gas
generator
Seat belt
tension