Mitsubishi Lancer Evolution 7. Manual — part 36
INTERIOR –
Supplemental Restraint System (SRS)
6-13
CONSTRUCTION AND OPERATION
NOTE
Refer to ’99 PAJERO in Technical Information
Manual (Pub. No. PYJE9805) or ’00 PAJERO PININ
Technical Information Manual (Pub. No. IKRE00E1)
for more information regarding the inflator and the
clock spring of the front passenger’s side air bag
module.
DRIVER’S SIDE AIR BAG MODULE
Both the type 1 and type 2 3-spokes (MOMO) 1are
equipped. The driver’s air bag module is an assem-
bly part composed of an air bag, module cover, in-
flator, and their fixing parts. It is mounted to the
steering wheel.
The air bag is made of nylon, and is inflated by gas
generated from the inflator. As the passenger
comes into contact with the air bag, the air bag starts
to deflate while gas is discharged from the two vents
at the back to ease the impact.
The inflator contains no sodium azide.
Caution
Never disassemble the air bag module. And nev-
er subject it to impact.
Air bag
Section A - A
Air bag module
Module cover
Inflator
A
A
Air bag
Module cover
Inflator
Section A - A
A
A
Air bag module
<TYPE 1>
<TYPE 2>
INTERIOR –
Supplemental Restraint System (SRS)
6-14
FRONT PASSENGER’S SIDE AIR BAG MODULE
The front passenger’s side air bag module consists
of air bag, inflator, module cover (incorporating the
instrument panel pad), and the fixing gear related to
those parts.
The air bag is made from nylon and inflates by the
gas generating from the inflator. As a passenger is
being pressed to the air bag, it deflates discharging
gas from two bores at the rear of the air bag to re-
duce the shock from the impact.
An inflator that does not contain sodium azide has
been adopted for all types of the air bag modules.
Caution
Never disassemble the air bag module. And nev-
er subject it to impact.
Section A - A
A
A
Air bag
Module cover
Inflator
Air bag module
SEAT BELT WITH PRETENSIONER
Seat belt with pre-tensioner is designed for instantly
taking up the seat belt at the time of impact to
improve restraint on a passenger. When the G
sensor in the SRS-ECU detects impact above a
certain level, the heater for ignition heats up
according to the signal from the SRS-ECU to ignite
the igniter and generate gas. The strip is pushed
outwards by the gas pressure. As the strip wound
around the clutch sleeve is pulled out, the clutch
sleeve rotates at high speed. The clutch sleeve
rotates to wind the waving.
Caution
Never disassemble the seat belt with preten-
sioner. And never subject it to impact.
Strip
Clutch sleeve
INTERIOR –
Supplemental Restraint System (SRS)
6-15
SRS-ECU
The SRS-ECU incorporates an analog G sensor
and safing G sensor for frontal collisions.
In frontal collisions, the driver’s and front passen-
ger’s air bags deploy only when both the analog
and safing G sensors detect simultaneously a colli-
sion-induced G of a level exceeding the threshold
as in the case with the conventional system.
Like the conventional system, the SRS-ECU is pro-
vided with the following capabilities:
D
Backup power supply in case of power failure
in collisions
D
Boosting function in case of battery voltage
drop
D
Self-diagnosis function to avoid system’s opera-
tion errors and improve its reliability
Caution
Never disassemble the SRS-ECU. And never
subject it to impact.
DIAGNOSIS FUNCTION
The SRS-ECU has the following functions to make
system checking using MUT-II easy.
D
Diagnosis code output
D
Service data output
DIAGNOSIS CODE OUTPUT
The SRS-ECU diagnoses the following items and
stores a diagnosis code in the non-volatile memory
(EEPROM*
1
) when a problem is detected.
Therefore, the memory is not deleted after a battery
terminal is disconnected. (The diagnosis code
memory can be deleted by the MUT-II.)
Code
No.
Major Contents of Diagnosis
14
Frontal collision analog G sensor failure
15
Frontal collision safing G sensor short-circuited
16
Frontal collision safing G sensor open-circuited
21*
3
Driver’s side front air bag squib short-circuited
22*
3
Driver’s side front air bag squib open-circuited
24*
3
Front passenger’s side front air bag squib short-circuited
25*
3
Front passenger’s side front air bag squib open-circuited
26*
3
Driver’s side front seat belt pretensioner short-circuited
27*
3
Driver’s side front seat belt pretensioner open-circuited
28*
3
Front passenger’s side front seat belt pretensioner short-circuited
29*
3
Front passenger’s side front seat belt pretensioner open-circuited
31
Capacitor voltage rises
32
Capacitor voltage drops
34*
2
Connector locking mechanism malfunction
35
Ignition of the air bag completed
41*
2
Power supply voltage (IG1 voltage) drops abnormally.
42*
2
Power supply voltage (IG1 voltage) drops abnormally.
43*
2
SRS warning lamp circuit open-circuited
44*
2
Defective SRS warning lamp circuit
45
Defective SRS-ECU
49
Air bag fully deployed
51
Driver’s side front air bag squib activating circuit short-circuited
INTERIOR –
Supplemental Restraint System (SRS)
6-16
Code
No.
Major Contents of Diagnosis
52
Driver’s side front air bag squib activating circuit open-circuited
54
Front passenger’s side front air bag squib activating circuit short-circuited
55
Front passenger’s side front air bag squib activating circuit open-circuited
56
Driver’s side front seat belt pretensioner activating circuit short-circuited
57
Driver’s side front seat belt pretensioner activating circuit open-circuited
58
Front passenger’s side front seat belt pretensioner activating circuit short-circuited
59
Front passenger’s side front seat belt pretensioner activating circuit open-circuited
61
Driver’s side front air bag squib drive circuit (power supply side) short-circuited
62
Driver’s side front air bag squib drive circuit (earth side) short-circuited
64
Front passenger’s side front air bag squib drive circuit (power supply side) short-circuited
65
Front passenger’s side front air bag squib drive circuit (earth side) short-circuited
66
Driver’s side front seat belt pretensioner drive circuit (power supply side) short-circuited
67
Driver’s side front seat belt pretensioner drive circuit (earth side) short-circuited
68
Front passenger’s side front seat belt pretensioner drive circuit (power supply side) short-circuited
69
Front passenger’s side front seat belt pretensioner drive circuit (earth side) short-circuited
NOTE
*
1:
Electrically Erasable Programmable ROM
*
2:
This diagnosis code memory will be automatically cleared from the memory and the SRS warning
lamp will be switched off when the system returns to normal condition.
*
3:
The diagnosis codes will remain in memory and the SRS warning lamp will be switched off if the
system returns to normal.
SERVICE DATA OUTPUT
When the SRS-ECU detects a problem, it stores
a diagnosis code and the duration of the problem
has lasted in the non-volatile memory. In addition,
how often a diagnosis code and duration are cleared
by the MUT-II are stored in the non-volatile memory
as a reference for service work. The data which
is stored can be read by the MUT-II.
No.
Service Data Item
Applicability
92
Number indicating how often the memory is cleared
Maximum time to be stored:
250
93
How long a problem has lasted (How long takes from the occur-
rence of the problem till the first air bag squid Igniting signal)
Maximum time to be stored:
9999 minutes (approximately
7days)
94
How long a problem has lasted (How long it takes from the first
air bag squib igniting signal signal till now)
( pp
y
7days)
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