Mitsubishi Eclipse. Technical Information Manual (1994) — part 83
Supplemental Restraint System (SRS)
Inflator
The inflator has a squib, ignition cord (fuse), priming
powder, gas generator, filter, etc. put in an aluminum
container and is installed inside the air bag module.
On one side of the inflator is the harness through
which an ignition current flows. When the current
flowing through the harness reaches the squib, a
small quantity of powder is burned to ignite the
ignition cord. The cord burns the priming powder
and the generated heat causes the gas generator
to burn. Combusion of the gas generator produces
nitorogen gas quickly, which is sent to the inside
of the air bag through the filter.
The filter eliminates cinders, lowers the gas tempera-
ture and reduce the gas generator noise.
The inflator has a shorting clip provided at the con-
nector of the squib harness in the same manner
as the driver’s side inflator.
Harness
Ignition cord (fuse)
Filter
Priming powder
I
Gas
Air bag deployment [in case of 50 km/h (30 mph) frontal
impact]
(1) OPERATION FOR APPROXIMATELY 15 MILLISECONDS
AFTER THE COLLISION
If a strong impact produced by a collision is detected by
either of the front impact sensors and the safing impact
sensor in approximately 10 milliseconds after the collision,
the SRS diagnostic unit will supply an ignition signal to
the squib.
In approximately 3 milliseconds after the ignition signal
has been supplied to the squib, gas generation will begin.
Supplemental Restraint System
(2) In approximately 20 milliseconds after the collision, the
air bag folded in the pad cover will begin to inflate, the
pad cover will break at its crease, and the air bag will
expand outward.
(3) In approximately 35 milliseconds after the collision, the
inflated air bag will touch the chest of the driver.
(4) In approximately 40 milliseconds after the collision, the
air bag will be fully inflated.
(5) In approximately 55 milliseconds after the collision, the
pressure of the driver against the air bag causes the gas
to escape through the two exhaust holes on the rear of
the module, and the deflation helps lessen the impact im-
posed on the driver.
(6) In approximately 105 milliseconds after the collision, the
air bag that has absorbed the impact will rapidly deflate,
providing visibility for the driver.
Restraint System
SRS DIAGNOSTIC UNIT
The SRS diagnostic unit monitors the impact
sors, squib, wiring harness, condensers, battery
age etc. If it detects a problem, it illuminates the
“SRS” warning light to alert the driver. It also stores
in memory what the problem is, and the duration
of the problem (the duration during which the
ing light stayed ON).
The condensers provided in the diagnostic unit
electric energy during the period the ignition
switch is ON. This supplies squib ignition current,
even if the power cable from the battery is broken
by the collision, to inflate the air bag as soon as
the front impact sensor and safing impact sensor
are simultaneously switched ON.
Caution
Make sure that the SRS diagnostic unit is never
disassembled.
1. Monitoring function
The SRS diagnostic unit monitors the wiring harness and SRS
components shown in the following table to check whether
they satisfy the specified values. When the ignition key is in
“ON” or “START” position, the SRS warning light should illumi-
nate for about 7 seconds and then turn off.
This indicates that the SRS system is in operational order.
If the SRS warning light does any of the following, immediate
inspection is needed.
(1) The SRS warning light does not illuminate as described
above.
(2) The SRS warning light stays on for more than 7 seconds.
(3) The SRS warning light illuminates while driving.
The fault data is stored in terms of a diagnostic code in the
non-volatile memory
The duration of the fault
is also stored in terms of the ON duration of the warning light.
Component
Front impact sensor
Air
bag module (Driver’s side)
Air bag module (Passenger’s side)
Condenser
Cranking detection circuit
Main Monitoring
Point
Short circuit
Open-circuit once
Open-circuit twice
Short circuit
Open circuit
Short circuit
Open circuit
Terminal voltage high
Terminal voltage low
Cranking signal detection
time
Diagnostic Code No.
11
12
13
21
22
24
25
31
32
3 3 ”
INTERIOR Supplemental Restraint System (SRS)
Component
Main Monitoring Point
Diagnostic Code No.
Double lock connector
Unlock or lock switch open-circuited
Battery
voltage low (Multi-purpose fuse No. 4 is blown)
voltage low (Multi-purpose fuse No. 8 is blown)
External circuit open-circuited or short-circuited
SRS warning light
Drive circuit defective
44
SRS diagnostic unit
NOTE
EEPROM Electrically Erasable Programmable ROM
A ROM to which data can be stored and be electrically written and from which data can be electrically erased.
**: Equipped. with the automatic diagnosis code erasure function. (Refer to
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