Mitsubishi Eclipse. Technical Information Manual (1994) — part 82
INTERIOR Supplemental Restraint System (SRS)
CONSTRUCTION AND OPERATION
IMPACT SENSORS
There are 2 different types of sensors used; 2 front
built in the SRS diagnosis unit. The right and left
impact sensors and safing impact sensor. One front
impact sensor is provided in each of the right and
front impact sensors are connected in parallel.
left shield
and one safing impact sensor is
The front impact sensors are connected in series
with the safing impact sensor.
Safing impact
sensor (Incorporated
in SRS diagnostic unit)
Air bag
module
<Driver’s side>
Front impact
sensor (L.H.)
From
power supply
<Passenger’s side>
Front impact
sensor (R.H.)
1 9 x 0 5 9 3
If a front-end collision causes either of the front
impact sensors and the safing impact sensor to
be simultaneously “ON”, the air bag will deploy.
They are constructed as shown below and contain
a G sensor each.
The front and safing impact sensors are essentially
identical in construction.
The G sensor consists of a moving contact which
is a roll spring wound around a roller, a fixed contact
positioned in its moving direction, consisting of a
base, a metallic case, etc. If an impact greater than
preset is applied in the direction of the arrow shown
in the illustration, the inertial force causes the roller
Front impact sensor
Safing impact sensor
Roller
Fixed
to rotate and move, so that contacts are brought
into the ON stage. To maintain a high measure
of G sensor reliability, the contacts have been gold
plated and the metallic case charged with an inactive
gas.
Each impact sensor contains a resistor connected
in parallel with the contacts for detection of a fault
in the wiring. The SRS diagnosis unit always sup-
plies a very small amount of current to the sensor
circuit to monitor a change in the circuit resistance.
Caution
Make sure that the impact sensors are never
disassembled.
Roller
Moving contact
Fixed contact
INTERIOR Supplemental Restraint System (SRS)
Hinge portion
of pad cover
Inflator
AIR BAG MODULE
<Driver’s side>
The air bag module is an assembly part comprising of an
air bag, pad cover, inflator, and parts for securing them. It
is provided at the center of the steering wheel.
Caution
Make sure that the air bag is never disassembled.
Section
A
Pad cover deploying direction
Air bag
The air bag is made of a nylon cloth with a rubber
coating inside. It is accommodated in the pad at
the center of the steering wheel together with the
inflator.
The air bag is inflated by the nitrogen gas from
the inflator. The load of the driver pressed against
Pad cover
The pad cover is made from urethane. When the
air bag deploys, the crease is broken, allowing the
air bag to move out and deploy with the hinge por-
tions as its fulcrums. The pad cover has a net, etc.
Groove portion
Pad cover
Groove
‘Air bag
Inflator
Section B B
the air bag by the impact causes the nitrogen gas
to escape through the two exhaust holes made on
the rear, and the deflation helps lessen the impact.
insert-molded except for the crease to prevent the
air bag from being broken as it deploys, and also
to prevent broken pieces from scattering around.
INTERIOR
Restraint System
Inflator
The inflator consists of a squib, igniter, gas
ants, diffuser screen, etc. contained in an aluminum
container. It is mounted in the air bag module hous-
ing.
The bottom of the inflator is provided with an electri-
cal connection to which an ignition current is sup-
plied. If current is supplied to the squib, a small
amount of explosive in the squib is burnt causing
the igniter to burn, and the resultant heat burns
the gas generants. Combustion of the generants
rapidly produces nitrogen gas which is forced
through the diffuser screen into the air bag. The
diffuser screen serves as a filter to remove cinders
and also helps cool down the gas temperature and
reduce the gas generation noise. A shorting pin
is provided in the connector portion of the squib.
Whenever the air bag module is removed, the short-
ing pin makes a short circuit across the terminals
to prevent flow of current caused by static electricity
to the squib.
Diffuser
Igniter
Gas
To air bag
To air bag
Shorting clip
Diffuser screen
Nitrogen gas
Flame
INTERIOR Supplemental Restraint System
<Passenger’s side>
The air bag module consists of an air bag, module cover,
inflator, and parts for securing them. It is provided above the
glove box.
Caution
Make sure that the air bag is never disassembled.
Module cover
Air bag
The air bag, made of nylon cloth lined with rubber
coating, is housed together with the inflator, under
the module cover provided above the glove box.
The air bag is inflated with nitrogen gas generated
by the inflator. Then, as the front passenger hits
Module cover
The module cover has aluminum sheet and urethane
formed into a unit. It is normally closed by hard
rubber type locks on both the sides.
When the air bag is deployed, the hard rubber type
lock is broken, allowing the module cover to turn
the air bag, the gas is discharged from the two
exhaust holes, one on each side, deflating the air
bag to reduce the impact on the passenger.
on the hinge provided at the upper part, open upward
and let the air bag out to be inflated.
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