Mitsubishi Lancer (4A9 engine). Manual - part 20

AC809021

SRS-ECU

SRS warning lamp

Driver's air bag module

Clock spring

Passenger's (front) 
air bag module

Diagnosis connector

Curtain air bag module

Side impact sensor

Front impact sensor

Side-airbag module

Seat belt pre-tensioner

AB

knee air bag module

Seat belt pre-tensioner

Passenger's air bag
 cut off switch

Passenger's air bag OFF indicator lamp

<For RUSSIA>

SRS warning lamp

<Except for RUSSIA and RALLIART>

SUPPLEMENTAL RESTRAINT SYSTEM (SRS)

GENERAL

00-77

AC801920

Curtain air bag module

Side impact sensor

Side-airbag module

Front impact sensor

AB

Seat belt pre-tensioner

Seat belt 
pre-tensioner

Passenger's air bag OFF indicator lamp

SRS-ECU

SRS warning lamp

Driver's air bag module

Clock spring

Passenger's (front) 
air bag module

Diagnosis connector

knee air bag module

Passenger's air bag
 cut off switch

<RALLIART>

SUPPLEMENTAL RESTRAINT SYSTEM (SRS)

GENERAL

00-78

SRS SERVICE PRECAUTIONS

GENERAL

00-79

SRS SERVICE PRECAUTIONS

M1001006000887

1. In order to avoid injury to yourself or others 

from accidental deployment of the SRS air bag 
during servicing, read and carefully follow all 
the precautions and procedures described in 
this manual.

2. Be sure to use the tester and special tools 

specified in this manual (Special tool: refer to , 
tester: refer to ).

3. Never attempt to repair the following 

components:

• SRS-ECU
• Driver's air bag module
• Clock spring
• Passenger's (front) air bag module
• Knee air bag module
• Curtain air bag module
• Front seat assembly incorporating side-air-

bag module

• Seat belt with pre-tensioner
• Front impact sensor
•

AC506921AB

SRS-ECU connector

Side impact sensor

4. Never attempt to repair the wiring harness 

connectors of the SRS. If a defective wiring 
harness is found, repair or replace it by 
referring to the table follows.

SRS-ECU 
terminal 
No.

Destination of wiring harness

Measures

1, 2

Instrument panel wiring harness 

→ knee air bag 

module

Repair or replace the instrument 
panel wiring harness.

5, 6

Instrument panel wiring harness 

→ clock spring → 

driver's air bag module (1st squib)

Replace the clock spring, or repair or 
replace the instrument panel wiring 
harness.

7, 8

Instrument panel wiring harness 

→ passenger's (front) 

air bag module (1st squib)

Repair or replace the instrument 
panel wiring harness.

9, 10

Instrument panel wiring harness 

→ clock spring → 

driver's air bag module (2nd squib)

Replace the clock spring, or repair or 
replace the instrument panel wiring 
harness.

11, 12

Instrument panel wiring harness 

→ passenger's (front) 

air bag module (2nd squib)

Repair or replace the instrument 
panel wiring harness.

15, 16

Instrument panel wiring harness 

→ CAN bus line

17

Instrument panel wiring harness 

→ earth

18

Instrument panel wiring harness 

→ Instrument centre 

panel

Repair or replace the instrument 
panel wiring harness.

19, 20

Instrument panel wiring harness 

→ passenger's air 

bag cut off switch

21, 22

Instrument panel wiring harness 

→ front wiring 

harness 

→ front impact sensor wiring harness → front 

impact sensor (LH) 

Repair or replace the wiring 
harnesses.

23, 24

Instrument panel wiring harness 

→ front wiring 

harness 

→ front impact sensor wiring harness → front 

impact sensor (RH) 

SRS SERVICE PRECAUTIONS

GENERAL

00-80

5. Before maintenance, wait for 60 seconds or 

more after the disconnection of the battery (

−) 

terminal. Wrap the disconnected (

−) terminal 

with tape for insulation. The condenser inside 
SRS-ECU keeps a voltage necessary to 
expand the air bag for a certain period even 
after the IG power is turned OFF. Therefore, if 
any operation is performed before the period 
elapses, it may cause serious damage.

6. If the influence of heat is suspected during 

painting work, remove the following parts:

• 93°C or higher SRS-ECU, air bag module, 

clock spring, front impact sensor, side impact 
sensor

• 90 °C or higher Seat belt with pre-tensioner

7. After the maintenance of the SRS air bag and 

seat belt with pre-tensioner is completed, be 
sure to delete the diagnosis code and check 
whether the SRS warning lamp lights up (refer 
to ).

31, 32

Floor wiring harness 

→ side-airbag module (LH)

Repair or replace the floor wiring 
harness.

33, 34

Floor wiring harness 

→ side-airbag module (RH)

39, 40

Floor wiring harness 

→ rear floor wiring harness (RH) 

→ curtain air bag module (RH)

Repair or replace the wiring 
harnesses.

41, 42

Floor wiring harness 

→ rear floor wiring harness (LH) 

→ curtain air bag module (LH)

43, 44

Floor wiring harness 

→ front passenger's seat belt 

pre-tensioner

Repair or replace the floor wiring 
harness.

45, 46

Floor wiring harness 

→ driver's seat belt pre-tensioner

49, 50

Floor wiring harness 

→ side impact sensor (LH)

51, 52

Floor wiring harness 

→ side impact sensor (RH)

61

Floor wiring harness 

→ ETACS-ECU (fuse No. 18)

62

Floor wiring harness 

→ ETACS-ECU (fuse No. 12)

AC300580AB

Insulating tape

Battery

Battery cable

SRS-ECU 
terminal 
No.

Destination of wiring harness

Measures