Mitsubishi Lancer Evolution IX. Manual - part 649

SRS CONTROL UNIT (SRS-ECU)

SUPPLEMENTAL RESTRAINT SYSTEM (SRS)

52B-109

SRS CONTROL UNIT (SRS-ECU)

REMOVAL AND INSTALLATION

M1524002100491

WARNING

•

Disconnect the negative battery terminal and wait for 60 seconds or more before starting 
work. Furthermore, the disconnected battery terminal should be covered with tape to 
insulate it.

•

Never attempt to disassemble or repair the SRS-ECU. If faulty, replace it.

•

Do not drop or subject the SRS-ECU to impact or vibration. If denting, cracking, deforma-
tion, or rust are discovered in the SRS-ECU, replace it with a new SRS-ECU. Discard the 
old one.

•

After deployment of an air bag, replace the SRS-ECU with a new one.

•

Never use an ohmmeter on or near the SRS-ECU, and use only the special test equipment 
described on 

P.52B-8

.

Pre-removal Operation
• Turn the ignition switch to the "LOCK" (OFF) position.

• Disconnect the Negative Battery Terminal.

AC311091

5.0 ± 1.0 N·m
 

5.0 ± 1.0 N·m

5.0 ± 1.0 N·m

1

2

3

AB

Removal steps 

•

Front floor console (Refer to 
GROUP 52A 

− Front floor console 

assembly 

P.52A-7

).

1.

SRS-ECU and SRS-ECU bracket

2.

SRS-ECU

3.

SRS-ECU bracket

Installation steps 

3.

SRS-ECU bracket

>>

A

<<

2.

SRS-ECU

1.

SRS-ECU and SRS-ECU bracket

•

Front floor console (Refer to 
GROUP 52A 

− Front floor console 

assembly 

P.52A-7

).

•

Negative battery cable connection

>>

B

<<

•

Post-installation inspection

DRIVER'S AND PASSENGER'S (FRONT) AIR BAG MODULES AND CLOCK SPRING

SUPPLEMENTAL RESTRAINT SYSTEM (SRS)

52B-110

INSTALLATION SERVICE POINTS
>>A<< SRS-ECU INSTALLATION

WARNING

The SRS may not activate if SRS-ECU is not 
installed properly.

>>B<< POST-INSTALLATION 
INSPECTION

1. Connect the negative battery cable.
2. Turn the ignition switch to "ON" position.

3. Does the SRS warning lamp illuminate for about 7 

seconds and then goes out?

4. If no, refer to troubleshooting (Refer to

P.52B-9

).

INSPECTION

M1524002200324

WARNING

If any problems are found, replace the 
SRS-ECU. 

• Check the SRS-ECU and brackets for dents, 

cracks or deformation. 

• Check the SRS-ECU connector for damage, and 

the terminals for deformation. 

NOTE: For the checks other than the items above, 
refer to "Troubleshooting" (Refer to 

P.52B-9

). 

DRIVER'S AND PASSENGER'S (FRONT) AIR BAG 

MODULES AND CLOCK SPRING

REMOVAL AND INSTALLATION

M1524014500269

WARNING

•

Disconnect the negative battery terminal and wait for 60 seconds or more before starting 
work. Furthermore, the disconnected battery terminal should be covered with tape to 
insulate it.

•

Never attempt to disassemble or repair the air bag modules or clock spring. If faulty, 
replace it.

•

Do not drop the air bag modules or clock spring or allow contact with water, grease or oil. 
Replace it if a dent, crack, deformation or rust is detected.

•

The air bag modules should be stored on a flat surface is facing upward. Do not place 
anything on top of it.

•

Do not expose the air bag modules to temperatures over 93

°

C.

•

After deployment of an air bag, replace the clock spring with a new one.

•

Wear gloves and safety glasses when handling air bags that have already deployed.

•

An undeployed air bag module should only be disposed of in accordance with the proce-
dures (Refer to 

P.52B-120

).

AC311044

SRS warning lamp

AB

DRIVER'S AND PASSENGER'S (FRONT) AIR BAG MODULES AND CLOCK SPRING

SUPPLEMENTAL RESTRAINT SYSTEM (SRS)

52B-111

<DRIVER’S AIR BAG MODULE AND CLOCK SPRING>

AC211864

AC504607

2

1

0.69 ± 0.15 N·m

3

50 ± 5 N·m

Section A - A

Section B - B

Claw

Claw

NOTE
          : Claw positions

A

A

B

B

Column switch

5

AB

Driver’s air bag module removal 
steps 

<<

A

>>

1. Cover

<<

B

>>

2. Steering wheel and driver’s air bag 

module assembly
Clock spring removal steps 

<<

A

>>

1. Cover

<<

B

>>

2. Steering wheel and driver’s air bag 

module assembly

•

Lower column cover (Refer to 
GROUP 37 

− Steering shaft 

P.37-15

).

<<

C

>>

3. Clock spring

Driver’s air bag module installation 
steps 

>>

A

<< • Pre-installation inspection

>>

C

<< 2. Steering wheel and driver’s air bag 

module assembly

1. Cover
•

Negative battery cable connection

>>

D

<< • Post-installation inspection

Clock spring installation steps 

>>

A

<< • Pre-installation inspection

>>

B

<< 3. Clock spring

•

Lower column cover (Refer to 
GROUP 37 

− Steering shaft 

P.37-15

).

>>

C

<< 2. Steering wheel and driver’s air bag 

module assembly

1. Cover
•

Negative battery cable connection

>>

D

<< • Post-installation inspection

Driver’s air bag module installation 
steps (Continued)

DRIVER'S AND PASSENGER'S (FRONT) AIR BAG MODULES AND CLOCK SPRING

SUPPLEMENTAL RESTRAINT SYSTEM (SRS)

52B-112

<PASSENGER'S (FRONT) AIR BAG MODULE>

REMOVAL SERVICE POINTS
<<A>> COVER REMOVAL

Insert the special tool ornament remover 
(MB990784) as shown in the illustration to remove 
the cover.

AC304946AB

1

Passenger’s (front) removal steps 

•

Instrument panel (Refer to GROUP 
52A 

− Instrument panel 

P.52A-2

).

<<

D

>>

1. Passenger’s (front) air bag module

Passenger’s (front) installation 
steps 

>>

A

<< • Pre-installation inspection

1. Passenger’s (front) air bag module
•

Instrument panel (Refer to GROUP 
52A 

− Instrument panel 

P.52A-2

).

•

Negative battery cable connection

>>

D

<< • Post-installation inspection

AC211761AB

MB990784