Mitsubishi Evolution X. Manual - part 734

SRS CONTROL UNIT (SRS-ECU)

TSB Revision

SUPPLEMENTAL RESTRAINT SYSTEM (SRS)

52B-383

SRS CONTROL UNIT (SRS-ECU)

REMOVAL AND INSTALLATION

M1524002101289

WARNING

•

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.

•

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 here 

P.52B-370

.

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

AC709073

4

3

2

9.0 ± 1.0 N·m
80 ± 9 in-lb    

9.0 ± 1.0 N·m
80 ± 9 in-lb    

1

AD

Removal steps 

<<A>>

1.

Negative (

−) battery cable

•

Floor console front bracket front 
(Refer to GROUP 52A, Front Floor 
Console Assembly 

P.52A-9

).

•

Instrument panel under cover 
(Refer to GROUP 52A, Instrument 
Lower Panel 

P.52A-8

).

•

Rear heater duct A (Refer to 
GROUP 55, Ducts 

P.55-138

).

2.

SRS-ECU mounting bolt (ground 
bolt)

3.

SRS-ECU mounting bolt

<<B>>

4.

SRS-ECU

Installation steps 

>>A<<

4.

SRS-ECU

3.

SRS-ECU mounting bolt

>>B<<

2.

SRS-ECU mounting bolt (ground 
bolt)

•

Floor console front bracket front 
(Refer to GROUP 52A, Front Floor 
Console Assembly 

P.52A-9

).

•

Instrument panel under cover 
(Refer to GROUP 52A, Instrument 
Lower Panel 

P.52A-8

).

•

Rear heater duct A (Refer to 
GROUP 55A, Ducts 

P.55-138

).

1.

Negative (

−) battery cable

>>C<<

•

Post-installation inspection

SRS CONTROL UNIT (SRS-ECU)

TSB Revision

SUPPLEMENTAL RESTRAINT SYSTEM (SRS)

52B-384

REMOVAL SERVICE POINTS

.

<<A>> NEGATIVE (

−)BATTERY CABLE DISCON-

NECTION

DANGER

Wait at least 60 seconds after disconnecting the bat-
tery cable before doing any further work (Refer to 

P.52B-25

).

WARNING

Battery posts, terminals and related accessories con-
tain lead and lead compounds. WASH HANDS AFTER 
HANDLING.

Disconnect the negative (

−) battery cable from the battery and 

tape the terminal to prevent accidental connection and deploy-
ment.

.

<<B>> SRS-ECU REMOVAL

While pushing the part "A" indicated in the figure of the harness 
side connector, turn the lock lever to the direction of the arrow 
to release the lock lever.

INSTALLATION SERVICE POINTS

.

>>A << SRS-ECU INSTALLATION

WARNING

The SRS may not activate if the SRS-ECU is not 
installed properly, which could result in serious injury 
or death to the vehicle's driver or front passenger.

.

ACX00583

Insulating tape

Battery cable

Battery

AF

AC506734

A

AD

Lock lever

SRS CONTROL UNIT (SRS-ECU)

TSB Revision

SUPPLEMENTAL RESTRAINT SYSTEM (SRS)

52B-385

>>B<< SRS-ECU MOUNTING BOLT (GROUND 
BOLT) INSTALLATION

Check the head mark "E" and install the ground bolt.

.

>>C<< POST-INSTALLATION INSPECTION

1. Reconnect the negative (

−) battery cable.

2. Turn the ignition switch to the "ON" position.
3. Does the "SRS" warning light illuminate for approximately 

seven seconds, and then go out?

4. If yes, the SRS system is functioning properly. If not, refer to 

P.52B-31

.

INSPECTION

M1524002200733

WARNING

If a dent, crack, deformation or rust is dis-
covered, replace the SRS-ECU with a new 
one. 

• Check the SRS-ECU and brackets for dents, 

cracks or deformation. 

• Check the SRS-ECU connector for damage, and 

the terminals for deformation. 

NOTE: Refer to 

P.52B-31

 for inspection of SRS-ECU 

for other than physical damage. 

AC105754

Ground bolt head mark

AD

AC709154

SRS warning light

AB

DRIVER'S AIR BAG MODULE AND CLOCK SPRING

TSB Revision

SUPPLEMENTAL RESTRAINT SYSTEM (SRS)

52B-386

DRIVER'S AIR BAG MODULE AND CLOCK SPRING

REMOVAL AND INSTALLATION 

M1524047500108

WARNING

•

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 with the pad cover facing upward. 
Do not place anything on top of it.

•

Do not expose the air bag modules to temperatures over 93

°

C (200

°

F).

•

After the air bag deployment, replace the air bag module with a new one. Also, check the 
clock spring, and replace with a new part if there is an abnormality.

•

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-417

).

•

When removing and installing the front passenger seat, be sure to carry out accuracy 
check of the occupant classification sensor after the seat has been installed in the vehicle 
(On-Vehicle Service 

P.52B-378

).

DRIVER'S AIR BAG MODULE AND CLOCK SPRING

Pre-removal operation

• Check that the front wheels are at the 

straight-ahead position.