Mitsubishi Lancer Evolution IX. Manual — part 623

SERVICE PRECAUTIONS

SUPPLEMENTAL RESTRAINT SYSTEM (SRS)

52B-5

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 front impact sensors, SRS-ECU,
driver’s and passenger’s (front) air bag modules,
clock spring, and seat belt pre-tensioner before
drying or baking the vehicle after painting.

• Front impact sensors, SRS-ECU, air bag mod-

ules, clock spring: 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

SPECIAL TOOLS

SUPPLEMENTAL RESTRAINT SYSTEM (SRS)

52B-6

SPECIAL TOOLS

M1524000700549

Tool

No.

Name

Use

MB991865

Dummy resistor

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

MB991866

Resistor harness

SRS air bag circuit check

MB991884

Resistor harness (For
Pre-tensioner)

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

MB686560

SRS air bag adapter
harness

• Deployment of passenger's

(front) air bag module inside
the vehicle

• Deployment of passenger's

(front) 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

MB990784

Ornament remover

Removal of cover.

MB991502

M.U.T.-II sub assembly

• Reading and erasing

diagnosis code

• Reading trouble period

• Reading erase times

MB991865

MB991866

MB991884

MB686560

MB991885

MB990784

B991502

SPECIAL TOOLS

SUPPLEMENTAL RESTRAINT SYSTEM (SRS)

52B-7

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

Checking diagnosis code

CAUTION

M.U.T.-III main harness B
(MB991911) should be used.
M.U.T.-III main harness A
should not be used for this
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

Use

MB991910

MB991826

MB991955

MB991911

MB991824

MB991827

MB991825

A

B

C

D

E

F

DO NOT USE

MB991223

A

D

C

B

AZ

DO NOT USE

MB992006

TEST EQUIPMENTS

SUPPLEMENTAL RESTRAINT SYSTEM (SRS)

52B-8

TEST EQUIPMENTS

M1524000800290

TROUBLESHOOTING

DIAGNOSIS TROUBLESHOOTING FLOW

M1524003100386

Refer to GROUP 00

− How to Use Troubleshoot-

ing/Inspection Service Points

P.00-5

.

DIAGNOSIS FUNCTION

M1524003200361

DIAGNOSIS CODES CHECK

CAUTION

Turn off the ignition switch before connecting or
disconnecting the M.U.T.-II/III.
Connect the M.U.T.-II/III to the diagnosis connector
(16-pin) under the instrument under cover, then
check diagnosis codes (Refer to GROUP 00

− How

to Use Troubleshooting/Inspection Service
Points

P.00-5

).

ERASING DIAGNOSIS CODE

CAUTION

Turn off the ignition switch before connecting or
disconnecting the M.U.T.-II/III.
Connect the M.U.T.-II/III to the diagnosis connector
and erase the diagnosis code.

SRS WARNING LAMP CHECK

M1524004300446

1. Check that the SRS warning lamp comes on

when the ignition switch is turned ON.

2. Check that the SRS warning lamp illuminates for

about 7 seconds and then goes out.

3. If this is not the cause, check the diagnosis codes.

Tool

Name

Use

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

AC311044

SRS warning lamp

AB