SsangYong Korando III (2010 year). Service manual — part 579

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1. AIR BAG SYSTEM OVERVIEW

The air bag system is divided into front air bag system and side air bag system. The system protects the

occupant's body by deploying the air bags in the event of a collision. The system consists of 8 inflators

including the inflators of the seat belt pretensioners, air bag unit (SDM), and 4 impact sensors on the

front side and both sides of the vehicle. The air bag unit (SDM) determines the operation of each air bag

module and seat belt pretensioners using the crash signals from the front and side impact sensors in the

event of a collision. The front and side air bag systems are operated independently, and the body control

module (BCM) activates the auto door unlock function and various lamps including hazard warning lamp

and room lamps, when the crash signal from the SDM is received to notify others of emergency situation

and let the occupant escape easily. The SDM is equipped with self diagnosis function, and it performs

the diagnosis on the internal/external devices of the air bag system for a certain period of time after IGN

ON. And it monitors the air bag system regularly and turns on the air bag warning lamp on the

instrument cluster when a fault is found in the system, to notify the driver. The SDM has event data

recorder (EDR) function that stores the driving information data transmitted through CAN communication

from various units (vehicle speeds, engine rpm, brake application, etc.) in a crash or near crash event,

when the acceleration sensor in the air bag unit detects a sharp acceleration change, regardless of the

air bag deployment

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Driver air bag

The air bag is installed at the center of the
steering wheel. The inflator of this air bag is
ignited momentarily in the event of a collision
and deploys the air bag cushion.

Air bag unit (SDM)

The air bag unit is installed in
the front side of the front
console, and it monitors the
air bag system and
determines the air bag
deployment in the event of a
collision.

Front impact sensor

The front impact sensors are fitted
at the bottom of both LH and RH
headlamp inside the front
bumper, and output signals that
activates the front air bag system.

Air bag warning lamp

This lamp notifies the driver about the result of the
diagnosis and faults.

Passenger air bag

This air bag is installed in the upper side
of the instrument panel on the
passenger side. It activates in the same
way of the driver air bag.

2. AIR BAG SYSTEM LAYOUT

Passenger Air Bag ON/OFF Switch

The front passenger air bag is disabled (not
inflatable) when placing the passenger air bag
ON/OFF switch to “OFF” position. This
switch is located on the right side of the
instrument panel, and you can see it when
opening the front passenger door. Press and
turn this switch to operate.
“OFF” position: disabled (not inflatable)
“ON” position: enabled (inflatable)

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Side air bag

The side air bags are installed in the
outer sides of the driver (LH) and
passenger (RH) seats to minimize
occupants' side injuries in case of a side
impact. This air bag is operated based
on the collision signal from the side
impact sensor.

Curtain air bag

The curtain air bags are installed to the upper end of
both doors. The air bag provides head protection for
the front and rear outboard occupants in a side
collision.

Side impact sensor

The side impact sensors are fitted at the
bottom of both LH and RH B-pillars, and
output signals that activates the side air
bag system.

BCM (Crash signal)

The BCM activates the auto door
UNLOCK, hazard warning lamp, and
room lamps when a crash signal of the
air bag unit (SDM) is input.

Seat belt pretensioner

The seat belt pretensioners of all seats are
operated at the same time, in the event of a
collision. They pull the seat belt and holds the
occupants in the seat to minimize the impact.

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3. AIR BAG SYSTEM OPERATING PROCESS

1) Air Bag System Input/Output

The air bag unit (SDM) performs the internal/external diagnosis on the air bag system for about 6

seconds after IGN ON. The air bag unit is ready to deploy air bag after this diagnosis, and when a

certain level of collision occurs, it determines the deployment of the air bag using the signals from the

impact sensors, deploys the corresponding air bag, and stores the collision data and EDR data. The

body control module (BCM) activates the auto door unlock function and various lamps including hazard

warning lamp and room lamps, when the crash signal from the SDM is received to notify others of

emergency situation and let the occupant escape easily.

Major functions

Detects frontal and side collision (Rear-end collision only with EDR trigger)

Activates the front air bag, side air bag, curtain air bag and belt pretensioners

Indicates system readiness and faults to the driver by means of a fault warning lamp

Facilitates servicing capability via a serial diagnostic communication interfaces

Records crash data and DTCs

Keeps power for deployment of air bag even when the power to the air bag unit is cut off due to the

collision

Event data recorder (EDR)

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