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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

Air bag

Module cover

Inflator

Section 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

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:

Backup power supply in case of power failure

in collisions

Boosting function in case of battery voltage

drop

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

Service data output

DIAGNOSIS CODE OUTPUT
The SRS-ECU diagnoses the following items and

stores a diagnosis code in the non-volatile memory

(EEPROM*

) 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

Frontal collision analog G sensor failure

Frontal collision safing G sensor short-circuited

Frontal collision safing G sensor open-circuited

21*

Driver’s side front air bag squib short-circuited

22*

Driver’s side front air bag squib open-circuited

24*

Front passenger’s side front air bag squib short-circuited

25*

Front passenger’s side front air bag squib open-circuited

26*

Driver’s side front seat belt pretensioner short-circuited

27*

Driver’s side front seat belt pretensioner open-circuited

28*

Front passenger’s side front seat belt pretensioner short-circuited

29*

Front passenger’s side front seat belt pretensioner open-circuited

Capacitor voltage rises

Capacitor voltage drops

34*

Connector locking mechanism malfunction

Ignition of the air bag completed

41*

Power supply voltage (IG1 voltage) drops abnormally.

42*

Power supply voltage (IG1 voltage) drops abnormally.

43*

SRS warning lamp circuit open-circuited

44*

Defective SRS warning lamp circuit

Defective SRS-ECU

Air bag fully deployed

Driver’s side front air bag squib activating circuit short-circuited

INTERIOR –

Supplemental Restraint System (SRS)

6-16

Code

No.

Major Contents of Diagnosis

Driver’s side front air bag squib activating circuit open-circuited

Front passenger’s side front air bag squib activating circuit short-circuited

Front passenger’s side front air bag squib activating circuit open-circuited

Driver’s side front seat belt pretensioner activating circuit short-circuited

Driver’s side front seat belt pretensioner activating circuit open-circuited

Front passenger’s side front seat belt pretensioner activating circuit short-circuited

Front passenger’s side front seat belt pretensioner activating circuit open-circuited

Driver’s side front air bag squib drive circuit (power supply side) short-circuited

Driver’s side front air bag squib drive circuit (earth side) short-circuited

Front passenger’s side front air bag squib drive circuit (power supply side) short-circuited

Front passenger’s side front air bag squib drive circuit (earth side) short-circuited

Driver’s side front seat belt pretensioner drive circuit (power supply side) short-circuited

Driver’s side front seat belt pretensioner drive circuit (earth side) short-circuited

Front passenger’s side front seat belt pretensioner drive circuit (power supply side) short-circuited

Front passenger’s side front seat belt pretensioner drive circuit (earth side) short-circuited

NOTE

Electrically Erasable Programmable ROM

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.

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

Number indicating how often the memory is cleared

Maximum time to be stored:

250

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)

How long a problem has lasted (How long it takes from the first

air bag squib igniting signal signal till now)

( pp

7days)

Content .. 34 35 36 37 ..