Pre-Tensioner Seat Belt Function; Pre-Tensioner Seat Belt Construction/Operation - Mazda RX-8 2004 Service Highlights

Inflator operation
1. The igniter built into the inflator begins to build up heat when the operation (deployment) signal is sent from the
SAS control module. The inflation agent is ignited by the build up of heat in the igniter.
2. The argon gas expands due to the heat of the ignited inflammation agent.
3. The expanding argon gas breaks the discharge barrier, is cooled and filtered by the filter, and then injected into
the air bag.
INFLATION AGENT
IGNITER
End Of Sie

PRE-TENSIONER SEAT BELT FUNCTION

• When a vehicle is involved in a frontal or frontal offset collision and the front seat belts are buckled, the pre-
tensioner seat belt system receives an operation signal from the SAS control module, retracting and tightening
the belt webbing instantly on the driver and front passenger restraints.
End Of Sie

PRE-TENSIONER SEAT BELT CONSTRUCTION/OPERATION

Construction
SPRING UNIT
GUIDE
PLATE
PRE-TENSIONER
COVER
AIR BAG SYSTEM
ARGON GAS
COMBUSTION OF
INFLATION AGENT
TORSION BAR
PINION
SPOOL
GAS
GENERATOR
BALL
PIPE
RING
GEAR
GUIDE
BLOCK
STOPPER
SPRING
LOCKING BASE
HOUSING
PAWL
PAWL
SPRING
SENSOR
UNIT
PRE-TENSIONER
PLATE
ARGON GAS
EXPANSION
TO AIR BAG
TO AIR BAG
DISCHARGE
BARRIER
CHU0810S302
CHU081057630S01
CHU081057630S02
LOCK GEAR
HOOK SPRING
RETAINER
FLY WHEEL
CHU0810S005
08–10–11
08–10