Mitsubishi Lancer Evolution IX. Manual — part 622

52B-1

GROUP 52B

SUPPLEMENTAL

RESTRAINT

SYSTEM (SRS)

CONTENTS

GENERAL INFORMATION . . . . . . . .

52B-2

SERVICE PRECAUTIONS. . . . . . . . .

52B-3

SPECIAL TOOLS. . . . . . . . . . . . . . . .

52B-6

TEST EQUIPMENTS . . . . . . . . . . . . .

52B-8

TROUBLESHOOTING . . . . . . . . . . . .

52B-8

POST-COLLISION DIAGNOSIS . . . .

52B-102

INDIVIDUAL COMPONENT

SERVICE . . . . . . . . . . . . . . . . . . . . . .

52B-105

WARNING/CAUTION LABELS . . . . .

52B-106

FRONT IMPACT SENSORS . . . . . . .

52B-107

REMOVAL AND INSTALLATION . . . . . . . .

52B-107

INSPECTION . . . . . . . . . . . . . . . . . . . . . . .

52B-108

SRS CONTROL UNIT (SRS-ECU) . . .

52B-109

REMOVAL AND INSTALLATION . . . . . . . .

52B-109

INSPECTION. . . . . . . . . . . . . . . . . . . . . . . .

52B-110

DRIVER'S AND PASSENGER'S (FRONT)

AIR BAG MODULES AND CLOCK

SPRING. . . . . . . . . . . . . . . . . . . . . . . .

52B-110

REMOVAL AND INSTALLATION . . . . . . . .

52B-110

INSPECTION. . . . . . . . . . . . . . . . . . . . . . . .

52B-115

SEAT BELTS WITH PRE-

TENSIONER . . . . . . . . . . . . . . . . . . . .

52B-117

REMOVAL AND INSTALLATION . . . . . . . .

52B-117

INSPECTION. . . . . . . . . . . . . . . . . . . . . . . .

52B-119

AIR BAG MODULE AND SEAT BELT
PRE-TENSIONER DISPOSAL

PROCEDURES . . . . . . . . . . . . . . . . . .

52B-120

WARNING

•

Carefully read and observe the information in the SERVICE PRECAUTIONS prior to any service.

•

For information concerning troubleshooting or maintenance, always observe the procedures in the

Troubleshooting section.

•

If any SRS components are removed or replaced in connection with any service procedures, be sure to follow the

procedures in the INDIVIDUAL COMPONENT SERVICE section for the comportments involved.

•

If you have any questions about the SRS, please contact your local distributor.

GENERAL INFORMATION

SUPPLEMENTAL RESTRAINT SYSTEM (SRS)

52B-2

GENERAL INFORMATION

M1524000100558

The Supplemental Restraint System (SRS) and seat
belt with pre-tensioner is designed to supplement the
driver's and front passenger's seat belts to help
reduce the risk or severity of injury to the driver and
front passenger by activating and deploying both
front air bags in certain frontal collisions.
The SRS consist of two air bag modules, SRS air
bag control unit (SRS-ECU), two front impact sen-
sors, SRS warning lamp, clock spring and seat belt
pre-tensioner. Front air bags are located in the centre
of the steering wheel and above the glove box. Each
air bag is made up of a folded air bag and an inflator
unit. The SRS-ECU under the front floor console

monitors the system and has a safing G-sensor and
analogue G-sensor. The warning lamp on the instru-
ment panel indicates the operational status of the
SRS. The clock spring is installed in the steering col-
umn. The seat belt pre-tensioner is built into the
driver's and passenger's front seat belt retractor. The
front impact sensor is assembled on the headlamp
support panel to monitor collision upon frontal
impact.
Only authorized service personnel should do work on
or around the SRS components. Those service per-
sonnel should read this manual carefully before start-
ing any such work.

AC310783

AC304668

AC310070

AC208855

Driver's air bag
module

Clock spring

Passenger's (front)
air bag module

SRS-ECU

Diagnosis connector

SRS warning lamp

Seat belt with
pre-tensioner

Front impact sensor

AB

SERVICE PRECAUTIONS

SUPPLEMENTAL RESTRAINT SYSTEM (SRS)

52B-3

SERVICE PRECAUTIONS

M1524000300596

DANGER

In order to avoid injury to yourself or others
from accidental deployment of the air bag
during servicing, read and carefully follow all
the precautions and procedures described in
this manual.

CAUTION

Do not use any electrical test equipment on or
near SRS components, except those specified on

P.52B-8

.

CAUTION

Never Attempt to Repair the Following Compo-
nents:

1. SRS air bag control unit (SRS-ECU)
2. Clock spring
3. Driver's and front passenger's (front) air bag

modules

4. Front impact sensor
5. Seat belt with pre-tensioner

NOTE: If any of these components are diagnosed as
faulty, they should only be replaced, in accordance
with the INDIVIDUAL COMPONENTS SERVICE pro-
cedures in this manual, starting at page

P.52B-105

.

CAUTION

AC300634

SRS-ECU connector

AB

SERVICE PRECAUTIONS

SUPPLEMENTAL RESTRAINT SYSTEM (SRS)

52B-4

Do not attempt to repair the wiring harness con-
nectors of the SRS. If a defective wiring harness
is found, repair or replace it by referring to the
table below.

SRS-ECU terminal No.

Destination of harness

Remedy

1, 2

Instrument panel wiring harness

→

Front wiring harness (RH)

→ Front

impact sensor (RH)

Correct or replace each wiring
harness.

3, 4

Instrument panel wiring harness

→

Front wiring harness (LH)

→ Front

impact sensor (LH)

Correct or replace each wiring
harness.

7

Instrument panel wiring harness

→

Earth

Correct or replace the instrument
panel wiring harness.

8

Instrument panel wiring harness

→

SRS warning lamp

Correct or replace the instrument
panel wiring harness.

9, 10

Instrument panel wiring harness

→

Passenger's (front) air bag module

Correct or replace the instrument
panel wiring harness.

11, 12

Instrument panel wiring harness

→

Clock spring

→ Driver's air bag

module

Correct or replace instrument panel
wiring harness. Replace the clock
spring.

13

Instrument panel wiring harness

→

Junction block (fuse No.3)

Correct or replace the instrument
panel wiring harness.

16

Instrument panel wiring harness

→

Junction block (fuse No.2)

Correct or replace the instrument
panel wiring harness.

20

Instrument panel wiring harness

→

Diagnosis connector

Correct or replace the instrument
panel wiring harness.

27, 28

Floor wiring harness (RH)

→

Passenger's (front) seat belt
pre-tensioner <LH drive vehicles>
Floor wiring harness (LH)

→

Passenger's (front) seat belt
pre-tensioner <RH drive vehicles>

Connect or replace the floor wiring
harness.

29, 30

Floor wiring harness (LH)

→ Driver's

seat belt pre-tensioner <LH drive
vehicles> Floor wiring harness (RH)
→ Driver's seat belt pre-tensioner
<RH drive vehicles>

Connect or replace the floor wiring
harness.