2005 SSANGYONG RODIUS Service Manual

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AIR BAG SYSTEM
1. COMPONENTS OF DRIVER'S AIRBAG MODULE

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2. COMPONENTS OF PASSENGER'S AIRBAG MODULE

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3. AIRBAG FUNCTION DESCRIPTION
1) 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, inflato
r
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. ·
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2) Airbag Module
The driver airbag module is under the center pad of the steering wheel.
The passenger airbag module is installed in the instrument panel at passenger side.
The driver and passenger side airbag is inside each seat.
3) 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. ·
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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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4) 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. ·
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5) SDM (Sensing and Diagnostic Module)
The airbag system consists of the module section (driver, passenger and side), seat belt
section and SDM.
The SDM has no user-serviceable parts and monitors the system components continuously.
The SDM also records any faults which are discovered.
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. 1.
2.
3.
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. ·
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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. ·
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6) 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.
Turning the steering wheel more than three and onequarter turns may damage the clock
spring. The contact coil should never be disassembled and must be replaced if the airbag
have been deployed. -
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 “43”. -
7) 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 o
r
deceleration of the vehicle.
8) Safety Sensor
The safety sensor is safety device made up of a dualcontact, electro-mechanical switch that:
Acts independently of the electronic components.
Connects the acceleration sensor in series in order to make up for the weak points in the
current electronic sensor. 1.
2.

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9) Micro Controller
This device receives the impact signal from the sensor for vehicle impact and identifies whether
the current condition 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 conduction 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.
10) Airbag Warning Lamp
The instrument cluster contains an airbag warning indicator 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.

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11) Wiring Harness Connectors
If the sensing and diagnostic module (SDM) electrical connector 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 shorting 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 ·
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The shorting bar is only a backup safety device. Always disable the supplemental restraints
system (SRS) before beginning any service procedure.
12) Belt Pretensioner
The belt pretensioner enables to retract the driver and the passenger seat belt webbing to
reduce any personal impact when accounted a frontal collision.

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4. INFLATION OF AIRBAG
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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:
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 ·
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