Mitsubishi Colt Ralliart. Manual - part 542

SERVICE PRECAUTIONS

SUPPLEMENTAL RESTRAINT SYSTEM (SRS)

52B-6

SRS-ECU terminal No.

Destination of harness

Remedy

1, 2

Instrument panel wiring harness 

→ 

Front wiring harness 

→ Front impact 

sensor (RH)

Correct or replace each wiring 
harness.

3, 4

Instrument panel wiring harness 

→ 

Front wiring harness 

→ Front impact 

sensor (LH)

Correct or replace each wiring 
harness.

5, 6

Instrument panel wiring harness 

→ 

Seat belt pre-tensioner (LH)

Correct or replace the instrument 
panel wiring harness.

7, 8

Instrument panel wiring harness 

→ 

Seat belt pre-tensioner (RH)

Correct or replace the instrument 
panel wiring harness.

9, 10

Instrument panel wiring harness 

→ 

Air bag module (Front passenger's 
side)

Correct or replace the instrument 
panel wiring harness.

11, 12

Instrument panel wiring harness 

→ 

Clock spring 

→ Air bag module 

(Driver's side)

Correct or replace instrument panel 
wiring harness. Replace the clock 
spring.

13

Instrument panel wiring harness 

→ 

Junction block (fuse No.37)

Correct or replace the instrument 
panel wiring harness.

16

Instrument panel wiring harness 

→ 

Junction block (fuse No.40)

Correct or replace the instrument 
panel wiring harness.

18

Instrument panel wiring harness 

→ 

SRS wiring lamp

Correct or replace the Instrument 
panel wiring harness.

19

Instrument panel wiring harness

→ 

Earth

Correct or replace the instrument 
panel wiring harness.

20

Instrument panel wiring harness 

→ 

Diagnosis connector

Correct or replace the instrument 
panel wiring harness.

21, 22

Instrument panel wiring harness 

→ 

Side-airbag module (LH)

Correct or replace the floor wiring 
harness.

23, 24

Instrument panel wiring harness 

→ 

Side-airbag module (RH)

Correct or replace the Instrument 
panel wiring harness.

27, 28

Instrument panel wiring harness 

→ 

Curtain air bag wiring harness 

→ 

Curtain air bag module (LH)

Correct or replace each wiring 
harness.

29, 30

Instrument panel wiring harness 

→ 

Curtain air bag wiring harness 

→ 

Curtain air bag module (RH)

Correct or replace each wiring 
harness.

34, 36

Instrument panel wiring harness 

→ 

Side impact sensor (LH)

Correct or replace the Instrument 
panel wiring harness.

40, 42

Instrument panel wiring harness 

→ 

Side impact sensor (RH)

Correct or replace the Instrument 
panel wiring harness.

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SERVICE PRECAUTIONS

SUPPLEMENTAL RESTRAINT SYSTEM (SRS)

52B-7

DANGER

After disconnecting the battery cable, wait 60 
seconds or more before proceeding with the 
following work. In addition, insulate the neg-
ative battery terminal with a tape. The con-
denser inside the SRS-ECU is designed to 
retain enough voltage to deploy the air bag 
for a short time even after the battery has 
been disconnected, so serious injury may 
result from unintended air bag deployment if 
work is done on the SRS system immediately 
after the battery cables are disconnected.

CAUTION

The SRS components and seat belt with pre-ten-
sioner should not be subjected to heat, so 
remove the SRS-ECU, driver’s and passenger’s 
(front) air bag modules, clock spring, front 
impact sensor, side impact sensor, side-airbag 
modules, curtain air bag modules and seat belt 
pre-tensioner before drying or baking the vehicle 
after painting.

• SRS-ECU, air bag modules, clock spring, 

impact sensors: 93

°C or more

• Seat belt with pre-tensioner: 90°C or more

CAUTION

Whenever you finish servicing the SRS, always 
erase the diagnosis code and check warning 
lamp operation to make sure that the system 
functions properly.

CAUTION

If checks are carried out by using the SRS-ECU 
harness connector, observe the following proce-
dures: Insert the special tool extra fine probe 
(MB992006) into connector from harness side 
(rear side), and connect the tester to this probe. If 
any tool than special tool is used, damage to the 
harness and other components will result. Never 
insert the probe directly to the terminals from the 
front of the connector. The terminals are plated 
to increase their conductivity, so that if they are 
touched directly by the probe, the plating may 
break, which will cause drops in reliability.

AC300580AB

Insulating tape

Battery

Battery cable

AC006195

SRS-harness connector

SRS-ECU harness connector
(rear side)

AH

MB992006

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SPECIAL TOOLS

SUPPLEMENTAL RESTRAINT SYSTEM (SRS)

52B-8

SPECIAL TOOLS

M1524000700925

Tool

No.

Name

Application

MB990784

Ornament remover

Removal of cover.

MB990803

Steering wheel puller

Steering wheel disconnection

MB991955
A: MB991824
B: MB991827
C: MB991910
D: MB991911
E: MB991825
F: MB991826

M.U.T.-III sub-assembly
A: Vehicle 
Communication 
Interface (V.C.I.)
B: M.U.T.-III USB cable
C: M.U.T.-III main 
harness A (Vehicles 
with CAN 
communication system)
D: M.U.T.-III main 
harness B (Vehicles 
without CAN 
communication system)
E: M.U.T.-III measure 
adapter
F: M.U.T.-III trigger 
harness

CAN bus diagnostics

CAUTION

For vehicles with CAN 
communication, use M.U.T.-III 
main harness A to send 
simulated vehicle speed. If you 
connect M.U.T.-III main harness 
B instead, the CAN 
communication does not 
function correctly.

MB991884

Resistor harness (For 
Pre-tensioner)

Seat belt with pre-tensioner 
circuit check and curtain air bag

MB991865

Dummy resistor

SRS air bag and seat belt with 
pre-tensioner circuit check

MB990784

MB990803

MB991910

MB991826

MB991955

MB991911

MB991824

MB991827

MB991825

A

B

C

D

E

F

DO NOT USE

MB991884

MB991865

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TEST EQUIPMENTS

SUPPLEMENTAL RESTRAINT SYSTEM (SRS)

52B-9

TEST EQUIPMENTS

M1524000800386

MB991866

Resistor harness

SRS air bag circuit check

MB686560 

SRS air bag adapter 
harness

• Deployment of front 

passenger's side air bag 
module inside the vehicle

• Deployment of front 

passenger's side air bag 
module outside the vehicle

MB991885

Pre-tensioner adapter 
harness

• Deployment of seat belt with 

pre-tensioner and curtain air 
bag inside the vehicle

• Deployment of seat belt with 

pre-tensioner and curtain air 
bag outside the vehicle

MB991223

A: MB991219
B: MB991220
C: MB991221
D: MB991222

Harness set

A: Check harness
B: LED harness
C: LED harness 

adapter

D: Probe

Checking the continuity and 
measuring the voltage at the 
SRS-ECU harness connector

MB992006

Extra fine probe

Continuity check and voltage 
measurement at harness wire or 
connector

Tool

No.

Name

Application

MB991866

MB686560

MB991885

MB991223

A

D

C

B

AZ

DO NOT USE

MB992006

Tool

Name

Application

Digital multi-meter 

Checking SRS electrical circuitry (Use 
multi-meter for which the maximum test 
current is 2 mA or less at minimum range 
of resistance measurement

AC300683

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