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Mitsubishi 380. Manual - part 825

TEST EQUIPMENT

SUPPLEMENTAL RESTRAINT SYSTEM (SRS)

52B-224

TEST EQUIPMENT

M1524000800256

SRS MAINTENANCE

M1524003900296

The SRS must be inspected by an authorised dealer up to 10
years after the date of vehicle registration. (Refer to GROUP
00, Maintenance Service

− SRS Maintenance ).

MB991884

Resistor harness (For
Pre-tensioner)

Seat belt with pre-tensioner
circuit check

MB991885

Pretensioner adapter
harness

• Deployment of seat belt with

pre-tensioner inside the
vehicle

• Deployment of seat belt with

pre-tensioner outside the
vehicle

MB991223
A: MB991219
B: MB991220
C: MB991221
D: MB991222
Harness set
A: Test harness
B: LED harness
C: LED harness adapter
D: Probe

General service tools

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

TOOL

TOOL NUMBER AND
NAME

SUPERSESSION

APPLICATION

MB991884

MB991885

MB991223

TOOL

NAME

USE

Digital multi-meter
Use a multi-meter for which the maximum
test current is 2 mA or less at the minimum
range of resistance measurement

Checking the SRS electrical circuitry with
SRS check harness

AC000019AB

POST-COLLISION DIAGNOSIS

SUPPLEMENTAL RESTRAINT SYSTEM (SRS)

52B-225

POST-COLLISION DIAGNOSIS

M1524001100852

To inspect and service the SRS after a collision (whether or not
the air bags have deployed), perform the following steps.

SRS-ECU MEMORY CHECK

Required Special Tool:

• MB991958: diagnostic tool (MUT-III Sub Assembly)

• MB991824: Vehicle Communication Interface (V.C.I.)

• MB991827: MUT-III USB Cable

• MB991910: MUT-III Main Harness A (Vehicles with CAN

communication system)

CAUTION

To prevent damage to diagnostic tool MB991958, always
turn the ignition switch to the "LOCK" (OFF) position
before connecting or disconnecting diagnostic tool
MB991958.
1. Connect diagnostic tool MB991958 to the data link

connector (16-pin).

2. Read (and write down) all displayed diagnostic trouble

codes (Refer to

P.52B-21

NOTE: If the battery power supply has been disconnected or
disrupted by the collision, diagnostic tool MB991958 cannot
communicate with the SRS-ECU. Check the battery, then
check and, if necessary, repair the front wiring harness and
the instrument panel wiring harness before proceeding.

3. Read the data list (fault duration and how many times

memories are erased), using diagnostic tool MB991958.

Data list

4. Erase the diagnostic trouble codes, and then turn the

ignition switch to the LOCK (OFF) position.

5. Wait for at least one second, and then turn the ignition

switch to the ON position again.

6. After waiting 15 seconds or more, note all displayed

diagnostic trouble codes (Refer to

P.52B-19

00DB076A

MB991910

DATA LINK

CONNECTOR

MB991824

MB991827

NO.

DATA LIST ITEM

APPLICABILITY

Failure continuation time 1

Maximum time to be stored: 9,999 minutes
(approximately seven days)

Failure continuation time 2

Elimination times

Maximum time to be stored: 255

POST-COLLISION DIAGNOSIS

SUPPLEMENTAL RESTRAINT SYSTEM (SRS)

52B-226

REPAIR PROCEDURE

WHEN FRONT AIR BAGS DEPLOY IN A COLLI-
SION.

1. Replace the following parts with new ones:

• SRS-ECU (Refer to

P.52B-234

• Air bag modules (Refer to

P.52B-237

• Seat belt with pre-tensioner (Refer to

P.52B-250

• Front seat asembly <Passenger’s side> (Refer to GROUP

52A, Front Seat Assembly

P.52A-21

• Front impact sensors (Refer to

P.52B-231

• Instrument panel (Refer to GROUP 52A, Instrument Panel

Assembly

P.52A-4

2. Check the following parts and replace if there are any

malfunctions:

• Clock spring (Refer to

P.52B-237

• Steering wheel, steering column shaft assembly

(1) Check the wiring harness (built into the steering wheel)

and connectors for damage, and terminals for
deformation.

(2) Install the air bag module to check fit and alignment with

the steering wheel.

(3) Check the steering wheel for noise, binding or difficult

operation and excessive free play.

(4) Check the steering column shaft shock absorbing

mechanism (Refer to GROUP 37, On-Vehicle Service

−

Steering Column Shaft Assembly Shock Absorbing
Mechanism Check ).

WARNING

[SRS is a safety related item, therefore there shall be no
attempt to repair any component or wiring harness related
to SRS]
3. Check the wiring harnesses for binding, the connectors for

damage, poor connections, and the terminals for
deformation. (Refer to

P.52B-16

WHEN SIDE AIR BAGS DEPLOY IN A COLLISION.

1. Replace the following parts with new ones:

• SRS-ECU (Refer to

P.52B-234

• Side impact sensors (Refer to

P.52B-247

• Front seat assembly (Refer to GROUP 52A, Front Seat

Assembly

P.52A-33

2. Check the wiring harnesses for binding, the connectors for

damage, poor connections, and the terminals for
deformation (Refer to

P.52B-16

WARNING

[SRS is a safety related item, therefore there shall be no
attempt to repair any component or wiring harness related
to SRS]

POST-COLLISION DIAGNOSIS

SUPPLEMENTAL RESTRAINT SYSTEM (SRS)

52B-227

WHEN AIR BAGS DO NOT DEPLOY IN
LOW-SPEED COLLISION.

Check the SRS components. If the SRS components are show-
ing any visible damage such as dents, cracks, or deformation,
replace them with new ones. Concerning parts removed for
inspection, replacement with new parts and cautionary points
for working, refer to appropriate INDIVIDUAL COMPONENT
SERVICE

P.52B-230

Front impact sensor

1. Check the radiator support panel for distortion and rust.

2. Check the front impact sensor for dents, cracks, deformation

or rust.

3. Check the front impact sensor wiring harness for binding,

check the connector for damage, and check the terminals
for deformation.

WARNING

[SRS is a safety related item, therefore there shall be no
attempt to repair any component or wiring harness related
to SRS]

SRS-ECU

1. Check the SRS-ECU case for dents, cracks or deformation.

2. Check the connector for damage, and the terminals for

deformation.

3. Check the installation of the SRS-ECU.

52DB024A

FRONT IMPACT
SENSOR

HEADLIGHT (RH)

RADIATOR SUPPORT
PANEL

24DB066A

SRS-ECU

CENTER

REINFORCEMENT

SRS-ECU

D-26 (Y),

C-121 (Y),

D-27 (Y)

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