Mitsubishi Evolution X. Manual - part 639

 

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Mitsubishi Evolution X. Manual - part 639

 

 

GENERAL INFORMATION

TSB Revision

SUPPLEMENTAL RESTRAINT SYSTEM (SRS)

52B-3

GENERAL INFORMATION

M1524000101528

WARNING

Improper service could result in serious 
injury of the service personnel or the pas-
senger.

.

The SRS is designed to supplement the front seat 
belts. It reduces injury to the driver(s) and the front 
passenger(s) by deploying air bag(s) in case of a 
frontal collision.

.

The SRS front air bags from an advanced air bag 
system together with sensors at the vehicle and sen-
sors attached to front seats.

.

With the knee air bag system, when an impact 
exceeds the threshold upon a frontal collision, and 
the cushion air bag is instantaneously inflated for 
better protection of the driver.

.

Side-air bag systems in the front seats are activated 
when side impacts exceed a criteria to protect the 
occupants’ upper bodies.

.

The curtain air bag system operates together with 
the side-air bag to protect the heads of passengers 
in the front and second seats.

.

The seat belts with pre-tensioner work simulta-
neously with the SRS. The seat belt incorporating the 
pre-tensioner automatically winds the seat belt upon 
front impact to reduce forward shifting of the driver’s 
and passenger’s. The seat belt use status is used to 
control the activation and deactivation of the pre-ten-
sioner.

.

The SRS consists of driver’s and passenger’s (front) 
air bag modules, knee air bag module, side-air bag 
modules, curtain air bag modules, SRS air bag con-
trol unit (SRS-ECU), two front impact sensors, two 
side impact sensors, SRS warning light, passenger’s 
air bag OFF indicator light, passenger’s seat belt 
warning light, clock spring, seat belt pre-tensioner, 

seat belt switch, seat slide sensor, weight sensor and 
occupant classification-ECU. Driver’s and passen-
ger’s (front) air bag modules are located in the center 
of the steering wheel and above the glove box. The 
knee air bag module is installed to the instrument 
panel cover lower under the steering column. 
Side-air bags are located inside the front seatback 
frame. The curtain air bag module consists of an air 
bag, an inflator, and the fixing gear relating to those 
parts, and is installed in the roof side sections (from 
the driver's and the passenger's front pillars to the 
rear pillars). Each air bag consists of a folded air bag 
and an inflator unit. The SRS-ECU placed on the 
forefront of the floor monitors the system and has a 
front air bag safing G-sensor, front air bag analog 
G-sensor and a side-air bag safing G-sensor. The 
front impact sensor is assembled in the front end 
upper bar to monitor impact in case of front impact. 
The side impact sensors inside the center pillars 
monitor the shock incurred by the sides of the vehi-
cle. The SRS warning light on the combination meter 
indicates the operational status of the SRS. The 
clock spring is installed in the steering column. The 
seat belt pre-tensioner is built into the driver's and 
passenger's front seat belt retractor. The seat slide 
sensor is installed at the seat adjuster section of the 
driver seat in order to detect the driver seat slide 
position. The weight sensor is installed underneath a 
rail of the passenger seat to detect the load on the 
seat. The passenger’s air bag OFF indicator light is 
installed to the lower left of the center panel, and illu-
minates when the passenger seat air bag is inactive. 
The passenger’s seat belt warning light is installed to 
the lower right of the center panel, and illuminates 
when the passenger is not wearing the seat belt. The 
seat belt switch detects whether the seat belt is 
used.
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.

.

GENERAL INFORMATION

TSB Revision

SUPPLEMENTAL RESTRAINT SYSTEM (SRS)

52B-4

ON-BOARD DIAGNOSTIC/SRS WARNING LIGHT 
FUNCTION

The diagnosis unit monitors the SRS system and stores data 
concerning any detected faults in the system. When the ignition 
switch is in "ON" or "START" position, the SRS warning light 
should illuminate for about seven seconds and then turn "OFF." 
That indicates that the SRS system is in operational order. If 
the SRS warning light does any of the following, immediate 
inspection by an authorized dealer is needed:
1. The SRS warning light does not illuminate as described 

above.

2. The SRS warning light stays on for more than seven 

seconds.

3. The SRS warning light illuminates while driving.
If a vehicle's SRS warning light is in any of these three condi-
tions, the SRS system must be inspected, diagnosed and ser-
viced in accordance with this manual.

AC709154

SRS warning light

AB

GENERAL INFORMATION

TSB Revision

SUPPLEMENTAL RESTRAINT SYSTEM (SRS)

52B-5

CONSTRUCTION DIAGRAM

NOTE: This construction diagram shows the general view of the SRS components. For details, refer to 
"Schematic (

P.52B-9

)", "Configuration Diagrams (

P.52B-12

)" and "Circuit Diagram (

P.52B-14

)". 

AC708198

AC100836

Curtain air bag module

Side impact sensor

Side-airbag module

Front impact sensor

SRS-ECU

Driver's air bag module

Clock spring

Passenger's (front) 
air bag module

Diagnosis 
connector

AC

SRS warning light

SRS warning light

<Vehicles for USA>

<Vehicles for CANADA>

Knee air bag module

Seat belt pre-tensioner

Occupant 
classification-ECU

Seat slide sensor

Weight sensor

Passenger's seat belt warning light

Passenger's air bag OFF indicator light

Vehicle 
identification 
code chart plate

Weight sensor

Seat belt 
pre-tensioner

GENERAL INFORMATION

TSB Revision

SUPPLEMENTAL RESTRAINT SYSTEM (SRS)

52B-6

WARNING/CAUTION LABELS

A number of caution labels related to the SRS are found in the vehicle, as shown in the following illustrations. 
Follow label instructions when servicing SRS. The label I is not to be removed except by owner. If the other 
labels are dirty or damaged, replace them.

AC708203

AC506231

AC608562

AC608596

AC608655

AC608593

AC608592

AC608953

AC611162

AC706054

AC705080

Driver's air bag module 

Clock spring

Sunvisor

Seat belt with pre-tensioner
(right and left)

D

B

SRS-ECU

Passenger's (front)
air bag module

A

E

F

I

Curtain air bag module
(right and left)

H

J

K

Glove box

AB

Knee air bag module

F

G

Side-airbag module
(right and left)

Center pillar (right and left)

C

 

 

 

 

 

 

 

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