SsangYong Stavic / SsangYong Rodius (2005 year). Service manual - part 423

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2. FUNCTION DESCRIPTION

Bag (Cushion)

• The airbag system performance is influenced on the

cushion size, shape and position.

• The cushion strength is a important parameter on the

impact absorb effect.

• Therefore, the control of the airbag performance

depends on cushion size, shape, inflator characteristic
and vent hole size for the gas discharge.

• The cushion’s material and folding function to control

the cushion deployment direction and the performance
to protect passenger’s face.

Module Cover/Housing

• It is a type of a container that includes the cushion

and the inflator.

• The module housing functions to deliver the reaction

force between the body structure and the airbag (The
airbag reaction is absorbed generally to the steering
wheel or instrument panel).

• The module cover must be considered in a viewpoint

of protection between exterior, internal units and
cushion. Also the module cover should be designed
not to cause any personal injury for deployment.

Inflator

• The inflator is a type of the direct gas generated device.

• The inflator with initial low pressure provides negative

restraint effect regarding passengers moving and time.

On the contrary, the inflator with initial high pressure
allows other components of the airbag to make a
excessive impact resulting in any personal injury.

Thus, the inflator output must be optimized according
to the characteristic of the vehicle and passenger
moving.

• The discharge gas has no toxicity or inflammability

and also it is the important parameter to control the
high temperature for gas firing.

Airbag Module

The driver airbag module is under the center pad of the
steering wheel.

The passenger airbag module is installed in the instru-
ment panel at passenger side.

The driver and passenger side airbag is inside each seat.

SDM (Sensing and Diagnostic
Module)

1. The airbag system consists of the module section

(driver, passenger and side), seat belt section and
SDM.

2. The SDM has no user-serviceable parts and monitors

the system components continuously. The SDM also
records any faults which are discovered.

3. The SDM allows the fault codes to be retrieved with a

scan tool and illuminates a warning lamp that alerts
the driver to any faults.

The SDM located on floor beneath the floor console
assembly. The SDM performs the following functions:

• Impact decision processor function.

• Determine the airbag deployment through the impact

signal of the accelerometer sensor and the safety
sensor.

 [Notice]

Do not disassemble the airbag module because
unintentional deployment of the airbags resulting from
any damage or interference of the module can cause
injury.

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• Malfunction detection and recording any faults that

are detected.

Monitor the supplemental restrain system electrical
components and set a diagnostic trouble code when
malfunction is detected.

• Display airbag fault codes

Display airbag fault codes and system status
information when connected to a scan tool.

• Self-diagnosis function

Illuminate the AIRBAG indicator to alert the driver to
any fault.

• Power supply function

Provide a reserve power source to deploy the airbags
and pretensioners if an accident has disabled the
normal power source.

Accelometer Sensor

The accelerometer sensor electronically represents the
acceleration or deceleration of the vehicle during a frontal
impact.

In this electronic representation, the electrical signal is
proportional to the acceleration or deceleration of the
vehicle.

Safety Sensor

The safety sensor is safety device made up of a dual-
contact, electro-mechanical switch that:

1. Acts independently of the electronic components.

2. Connects the acceleration sensor in series in order

to make up for the weak points in the current
electronic sensor.

Micro Controller

This device receives the impact signal from the sensor for
vehicle impact and identifies whether the current condi-
tion is necessary for airbag deployment or not. And then
the controller sends the specified currents to the airbag
ignition circuit as needed.

This device always monitors the airbag system in con-
duction with the diagnostic circuit. When it is detected
any problem, it illuminates the airbag warning indicator to
inform driver of the fault and stores the fault information.

Contact Coil

The contact coil is installed between the steering wheel
and the steering column and contains a coil that enables
to contact electrically between the airbag wiring harness,
the driver airbag module and the horn switch.

 [Notice]

Turning the steering wheel more than three and one-
quarter turns may damage the clock spring. The contact
coil should never be disassembled and must be replaced
if the airbag have been deployed.

 [Notice]

Turn the label of the clock spring clockwise to lock and
turn the label of the clock spring counterclockwise
approximately 2.9 ± 0.2 turns to the neutral positions
with the front wheels ahead.

Align the pointed marks “

4

4

4

4

43

3

3

3

3”.

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Airbag Warning Lamp

The instrument cluster contains an airbag warning indica-
tor bulb to verify the operation of the AIRBAG indicator
and sensing and diagnostic module (SDM).

The SDM performs a turn-on test when the ignition is turned
ON. The SDM flashes the AIRBAG indicator seven tomes
by supplying an intermittent ground to the indicator lamp
circuit. After flashing seven times, the AIRBAG indicator
will turn off if no more malfunctions have been detected.

Warning Lamp Status

Fault Contents

Wiring Harness Connectors

If the sensing and diagnostic module (SDM) electrical con-
nector is not attached properly, a built in shorting bar will
connect the wire from airbag warning lamp with the SDM
ground wire. This turns on the AIRBAG indicator.

To prevent deployment during servicing, additional short-
ing bars are located in following locations:

• Driver airbag module connector

• Passenger airbag module connector

• Driver and passenger side airbag module connector

• SDM wiring harness connector

• Contact coil connector to airbag wiring harness

The shorting bar is only a backup safety device. Always
disable the supplemental restraints system (SRS) before
beginning any service procedure.

Belt Pretensioner

The belt pretensioner enables to retract the driver and the
passenger seat belt webbing to reduce any personal im-
pact when accounted a frontal collision.

Flash seven times within 7
seconds and then turn off

Warning lamp stays ON

No turn on

System OK

System fault

Internal SDM fault

Power supply circuit open
and fuse open

Warning lamp circuit open

SDM fault

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3. INFLATION OF AIRBAG

Front Airbag Operation (Driver’s and Passenger’s)

The air bag inflates when:

• Frontal impact against a solid concrete wall at over 25 km/h or near-frontal impact within 30 degrees from the center

of the vehicle at both corners

The air bag can inflate when:

• Underbody impact from the road surface; impact against the curb at a very high speed; dropping impact onto the

road surface with a large angle

The air bag does not inflate when:

• Rollover, side impact or rear impact

The air bag seldom inflates when:

• Oblique impact, rollover

• Weak impact in which the sensor is unable to detect (under the inflation requirements)

• Impact against narrow objects such as a telegraph pole or a tree

• The vehicle falls into a drainage or a puddle

• The front of the vehicle crashes into high impact point vehicle such as a truck

• Impact on the hood by falling stones

• The air bag warning lamp is on