SsangYong Korando III (2010 year). Service manual — part 581

02-17

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General deployment of air bag

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3) Deployment Procedure

Air bag cover (opening section)

Air bag cushion

Vent hole

Inflator

Filter

Ignition

Gas generator

In general, the air bag unit transmits the ignition current to the ignition device of the corresponding air bag

inflator when a collision signal from the impact sensor is sent to the air bag unit

When the ignition device of the inflator is ignited, the gas generator generates nitrogen gas by being

burned, and this gas inflates the air bag cushion through the filter. The nitrogen gas used to inflate the air

bag exhausts through the vent hole immediately.

Cross section of driver air bag

Cross section of inflator

02-18

Seat belt pretensioner deployment

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Original status

1.

Pretensioner operating

2.

Load limiter operating

3.

Inflator

Piston

The piston and pinion in the seat belt

pretensioner are disengaged and the tension of

the return spring in it holds the occupant.

When the ignition current is transmitted from the

air bag unit to the ignition device of the seat belt

pretensioner, gas is generated from the inflator

and this pushes up the piston.

When the piston gear engages with the pinion

gear, the clutch is integrated and winds the seat

belt.

When the load on the seat belt increases and the

inner device stars being deformed, the pinion

rotates in reverse direction and the piston moves

downward. The residual pressure is released

through the vent hole of the piston when the

piston moves down. The gears of pinion and

piston are disengaged when the piston is located

at the lowest position.

Pinion

02-19

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4) Air Bag Deployment Signal to BCM

The air bag deployment signal from the air bag unit is sent to the BCM. This signal triggers the flash of

the hazard warning lamp to notify others of emergency situation, and is used as a signal that turns on the

room lamps and activates auto door unlock function for the occupants.

The air bag unit of a vehicle without side air bag system can also send the crash signal to the BCM

according to the value of the acceleration sensor to activate the auto door unlock and various lamps

including hazard warning lamp and room lamps.

02-20

When a situation which requires an air bag deployment occurs, they system outputs the air bag

deployment signal (crash out). If another air bag-required situation occurs while the deployment signal is

sent, the second crash out will be delayed until the current 200 ms crash out is completed. (The
tolerance at the time of signaling is ±5%)

The signal repeats increasing for 390 msec. and decreasing for 10 msec. before crash. At the time of

crash, the air bag deployment signal is output to the BCM for 200 ms immediately.

(1) Air bag deployment signal output (crash out)