Mitsubishi Galant (2004+). Manual - part 1613

SRS AIR BAG DIAGNOSIS

TSB Revision

SUPPLEMENTAL RESTRAINT SYSTEM (SRS)

52B-345

FAIL-SAFE FUNCTION

M1524003700021

If the SRS-ECU determines that the following parts 
are defective, the SRS-ECU operates the SRS warn-
ing light and controls as follows.

• If the seat belt switch is defective, the SRS-ECU 

determines that the seat belt is fastened and con-
trols the seat belt with pre-tensioner.  

• If the seat slide sensor is defective, the SRS-ECU 

determines that the seat is in its backward posi-
tion and controls the air bag. 

• If the occupant classification sensor or the occu-

pant classification-ECU is defective, the 
SRS-ECU determines that the occupant classifi-
cation is class 2 (The occupant classification sen-
sor detects 30 kg or more.) and controls the air 
bag and the passenger’s air bag OFF indicator 
light.

ACCURACY TESTING OF OCCUPANT CLASSIFICATION SENSOR

M1524025800015

The scan tool can be used to perform the next func-
tion.

• Seat Weight Sensor Accuacy Check

• Zero-calibration

SPECIAL TOOLS

TSB Revision

SUPPLEMENTAL RESTRAINT SYSTEM (SRS)

52B-346

SPECIAL TOOLS

M1524000700453

TOOL

TOOL NUMBER AND 
NAME

SUPERSESSION

APPLICATION

MB990803
Steering wheel puller

General service tool

Steering wheel removal

MB991958

A: MB991824
B: MB991827
C: MB991910
D: MB991911
E: MB991914
F: MB991825
G: MB991826

Scan tool (MUT-III sub 
assembly)

A: Vehicle 

communication 
interface (V. C. I.) 

B: MUT-III USB cable
C: MUT-III main harness 

A (Vehicles with CAN 
communication 
system)

D: MUT-III main harness 

B (Vehicles without 
CAN communication 
system)

E: MUT-III main harness 

C (For daymler 
chrysler models only)

F: MUT-III measurement 

adapter

G: MUT-III trigger 

harness

MB991824-KIT
NOTE: G: MB991826 
MUT-III Trigger 
Harness is not 
necessary when 
pushing V.C.I. ENTER 
key.

Checking diagnostic trouble code

CAUTION

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

MB991865

Dummy resistor

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

MB991866

Resistor harness

SRS air bag circuit check

MB990803AB

MB991910

MB991826

MB991958

MB991911

MB991914

MB991824

MB991827

MB991825

DO NOT USE

A

B

C

D

E

F

G

DO NOT USE

MB991865

MB991866

TEST EQUIPMENT

TSB Revision

SUPPLEMENTAL RESTRAINT SYSTEM (SRS)

52B-347

TEST EQUIPMENT

M1524000800256

SRS MAINTENANCE

M1524003900296

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

− SRS Maintenance 

P.00-57

).

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

A

D

C

B

AG

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

TSB Revision

SUPPLEMENTAL RESTRAINT SYSTEM (SRS)

52B-348

POST-COLLISION DIAGNOSIS

M1524001100506

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: Scan 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 scan tool MB991958, always turn the 
ignition switch to the "LOCK" (OFF) position before con-
necting or disconnecting scan tool MB991958.
1. Connect scan tool MB991958 to the data link connector 

(16-pin).

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

codes (Refer to 

P.52B-33

).

NOTE: If the battery power supply has been disconnected or 
disrupted by the collision, scan tool MB991958 cannot com-
municate 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 scan 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-30

).

AC305412

AB

MB991910

DATA LINK

CONNECTOR

MB991824

MB991827

NO.

DATA LIST ITEM

APPLICABILITY

01

Failure continuation time 1

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

02

Failure continuation time 2

10

Elimination times

Maximum time to be stored: 255