D CONSTRUCTION AND OPERATION 1 General The seat belt pretensioner consists of

D construction and operation 1 general the seat belt

This preview shows page 90 - 94 out of 114 pages.

D CONSTRUCTION AND OPERATION 1. General The seat belt pretensioner consists of the pretensioner mechanism, retractor mechanism, and ELR locking mechanism. The pretensioner mechanism consists of a pretensioner sensor, gas generator, cylinder, etc. The pretensioner sensor detects the vehicle’s deceleration speed during a collision. In addition, a safety device is installed to prevent the seat belt pretensioner from being activated by the seat belt retractor assembly alone.
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92 BODY — SEAT BELT PRETENSIONER 2. Gas Generator with Pretensioner Sensor The pretensioner sensor consists of a inertial mass, trigger shaft, firing pin, firing spring, etc. The trigger shaft and the firing pin are normally engaged with each other so that the firing pin is not ejected. In addition, if any unnecessary inertial mass movement is suppressed by the bias spring force, the seat belt pretensioner is not activated by mistake. If a severe frontal collision occurs, the vehicle decelerates instantaneously. The inertial mass begins to move despite the bias spring force. If rapid deceleration continues, the spring force of the firing spring disengages the firing pin from the trigger shaft, ejects the firing pin, and ignites the primer. The flame spreads instantaneously to the gas generator and a large amount of gas is generated from the gas generator. " Non-Deployed State A " Deployed State A 3. Pretensioner Mechanism When the pretensioner sensor comes on, the gas generator emits gas in an extremely short time and pushes the piston. Since the cable is attached to the piston, the piston will pull on the cable causing the drum to grab onto the shaft. The shaft will then move in the retracting direction taking up the belt for a predetermined length.
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93 BODY — SEAT BELT PRETENSIONER 4. Safety Device To activate the safety device, the sensor lock button illustrated below must be pressed with a flat-blade screwdriver or an equivalent tool, which causes the sensor lock release lever to push out and turn 90 _ clockwise. As a result, the trigger shaft becomes fixed and stops the operation of the seat belt pretensioner. To release the safety device, rum the sensor lock release lever counterclockwise and press it in. " Safety Device Active A " Safety Device Released A Service Tip During the installation of a seat belt pretensioner onto the vehicle, if the safety device is active, the sensor lock release lever and center pillar garnish infringe upon each other and will prevent the center pillar garnish from attaching. This prevents the technician from forgetting to release the safety device.
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94 BODY ELECTRICAL — LIGHTING BODY ELECTRICAL LIGHTING D DESCRIPTION The new ES300 has the following systems: System Outline Headlights The new ES300 has newly adopted the 4-light multi-reflector type headlights.
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