Mitsubishi Grandis. Manual - part 1043

SRS CONTROL UNIT (SRS-ECU)

SUPPLEMENTAL RESTRAINT SYSTEM (SRS)

52B-224

REMOVAL SERVICE POINT
<<A>>NEGATIVE BATTERY CABLE 
DISCONNECTION

DANGER

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

P.52B-7

).

WARNING

Battery posts, terminals and related 
accessories contain 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 air bag(s) deployment.

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 key to "ON" position.

3. Does the SRS warning lamp illuminate for about 7 

seconds, and then remain extinguished for at 
least 5 seconds after turning OFF?

4. If no, refer to troubleshooting (Refer to

P.52B-13

).

INSPECTION

M1524002200421

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-13

). 

•

Gearshift link mounting bracket 
<M/T> (Refer to GROUP 22A, 
Transmission control assembly 

P.22A-7

.)

2.

SRS-ECU
Installation steps

>>A<<

2.

SRS-ECU

•

Gearshift link mounting bracket 
<M/T> (Refer to GROUP 22A, 
Transmission control assembly 

P.22A-7

.)

•

Rear heater duct (Refer to GROUP 
55, Ventilators 

P.55-229

.)

•

Centre console (Refer to GROUP 
52A, Instrument panel assembly 

P.52A-2

.)

1.

Negative battery cable connection

>>B<<

•

Post-installation inspection

Removal steps (Continued)

ACX00583

Insulating tape

Battery

Battery cable (–)

AC

AC312486

SRS warning lamp

AB

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

SUPPLEMENTAL RESTRAINT SYSTEM (SRS)

52B-225

DRIVER'S, FRONT PASSENGER'S AIR BAG MODULE(S) 

AND CLOCK SPRING

REMOVAL AND INSTALLATION

M1524014500043

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 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 non-deployed air bag module should only be disposed of in accordance with the 
procedures (Refer to 

P.52B-246

).

<DRIVER’S AIR BAG MODULE AND 
CLOCK SPRING>

AC312548

AC312158

AB

1

2

3

7

41 ± 8 N·m

0.70 ± 0.15 N·m

N

6

5

A

A

Section

 A - A

Claw

7

6

9.0 ± 2.0 N·m

8

B

C

C

Column switch

Section B - B

Section C - C

Claw

Claw

Note

8

B

: Claw positions

4

Air bag module removal steps

<<A>>

1. Negative battery cable connection

<<B>>

2. Cover
•

Horn connector connection

<<C>>

•

Air bag module connector connection

<<D>>

3. Air bag module

Air bag module removal steps 

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

SUPPLEMENTAL RESTRAINT SYSTEM (SRS)

52B-226

<PASSENGER'S (FRONT) AIR BAG 
MODULE>

Clock spring removal steps

<<A>>

1. Negative battery cable connection

<<B>>

2. Cover
•

Horn connector connection

<<C>>

•

Air bag module connector connection

<<D>>

3. Air bag module
4. Clock spring sub harness <Vehicles 

for auto-cruise control switch>

<<E>>

5. Steering wheel assembly
6. Lower column cover
7. Upper column cover

<<F>>

8. Clock spring

Air bag module installation steps

>>A<<

•

Pre-installation inspection

>>C<<

3. Air bag module

>>D<<

•

Air bag module connector connection

>>D<<

•

Horn connector connection

2. Cover

1. Negative battery cable connection

>>E<<

•

Post-installation inspection
Clock spring installation steps

>>A<<

•

Pre-installation inspection

>>B<<

8. Clock spring
7. Upper column cover
6. Lower column cover

>>C<<

5. Steering wheel assembly
4. Clock spring sub harness <Vehicles 

for auto-cruise control switch>

>>C<<

3. Air bag module
2. Cover
1. Negative battery cable connection

>>E<<

•

Post-installation inspection

Air bag module installation steps 

AC312550

AC312210

AC311439

2

AB

3

5.0 ± 1.0 N·m

1

Removal steps

<<A>>

1. Negative battery cable connection
•

Instrument panel (Refer to GROUP 
52A, Instrument panel 

P.52A-2

.)

2. Backbone bracket

<<G>>

3. Passenger’s (front) air bag module

Installation steps

>>A<<

•

Pre-installation inspection

3. Passenger’s (front) air bag module
2. Backbone bracket
•

Instrument panel (Refer to GROUP 
52A, Instrument panel 

P.52A-2

.)

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

SUPPLEMENTAL RESTRAINT SYSTEM (SRS)

52B-227

REMOVAL SERVICE POINTS
<<A>> NEGATIVE BATTERY CABLE 
DISCONNECTION

DANGER

Wait at least 60 seconds after disconnecting 
the battery cable before doing any further 
work. (Refer to 

P.52B-7

).

WARNING

Battery posts, terminals and related 
accessories contain 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 air bag(s) deployment.

<<B>>COVER REMOVAL

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

<<C>> AIR BAG MODULE CONNECTOR 
DISCONNECTION

Slide the outer housing of the clock spring or front 
passenger’s air bag module connector in the arrow 
direction shown, and disconnect the connector.

<<D>> DRIVER’S AIR BAG MODULE 
REMOVAL

WARNING

•

Never use an electric tester to diagnose 
the air bag module circuit. Never attempt 
to disassemble the air bag module.

•

The removed driver's air bag module 
should be stored in a clean, dry place with 
the deployment surface facing up.

<<E>> STEERING WHEEL ASSEMBLY 
REMOVAL

CAUTION

Use the special tool to remove the steering wheel 
since the steering column collision absorbing 
mechanism may be damaged.
1. Position the steering wheel in a straight ahead 

direction.

2. Using the special tool (Steering wheel puller, 

MB990803), remove the steering wheel assembly 
as shown in the figure.

1. Negative battery cable connection

>>E<<

•

Post-installation inspection

Installation steps (Continued)

ACX00583

Insulating tape

Battery

Battery cable (–)

AC

AC302436AD

MB990784

Cover

AC306561AG

Outer housing of the  clock spring or 
front passenger's air bag module connector

AC302792

AC

MB990803