Mitsubishi 380. Manual - part 824

SRS AIR BAG DIAGNOSIS

SUPPLEMENTAL RESTRAINT SYSTEM (SRS)

52B-220

INSPECTION PROCEDURE 3: When the Ignition Key is Turned to "ON" (Engine Stopped), the SRS 
Warning Lamp does not Illuminate. INSPECTION PROCEDURE 4: The SRS Warning Lamp Remains 
Illuminated after the Engine is Started.

.

TECHNICAL DESCRIPTION (COMMENT)

• The SRS-ECU sends the SRS warning lamp sig-

nal to the combination meter via the CAN com-
munication.

• This may be caused by faults in the CAN bus line, 

the combination meter or the SRS-ECU.

.

TROUBLESHOOTING HINTS (THE MOST 
LIKELY CAUSES FOR THIS CASE:) 

• Damaged wiring harness or connector

• Combination meter defect 

• Malfunction of the SRS-ECU

• Refer to circuit diagrams GROUP-

90

• Refer to configuration diagrams GROUP-

80

.

DIAGNOSIS

Required Special Tools:

• 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)

.

STEP 1. Using diagnostic tool MB991958, diagnose the 
CAN bus line.

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.
Use diagnostic tool MB991958 to diagnose the CAN bus lines.
(1) Connect diagnostic tool MB991958 to the data link 

connector.

(2) Turn the ignition switch to the "ON" position.
(3) Diagnose the CAN bus line.

Q: Is the check result satisfactory?

YES : Go to Step 2.
NO :  Repair the CAN bus lines (Refer to GROUP 54C, 

Diagnosis-Can Bus Diagnostic Chart ). Repair the 
CAN bus lines, and then go to Step 2.

00DB076A

MB991910

DATA LINK

CONNECTOR

MB991824

MB991827

SRS AIR BAG DIAGNOSIS

SUPPLEMENTAL RESTRAINT SYSTEM (SRS)

52B-221

STEP 2. Using diagnostic tool MB991958, read the 
combination meter diagnostic trouble code.

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.
Use diagnostic tool MB991958 to check whether combination 
meter DTC U1112 has been set.
(1) Connect diagnostic tool MB991958 to the data link 

connector.

(2) Turn the ignition switch to the "ON" position.
(3) Check whether combination meter DTC U1112 has been 

set.

Q: Is combination meter DTC U1112 set?

YES : Replace the SRS-ECU. 
NO :  Replace the combination meter.

00DB076A

MB991910

DATA LINK

CONNECTOR

MB991824

MB991827

SRS AIR BAG DIAGNOSIS

SUPPLEMENTAL RESTRAINT SYSTEM (SRS)

52B-222

DATA LIST REFERENCE TABLE

M1524003500038

The following items can be read by the diagnostic 
tool from the SRS-ECU input data.

NOTE: 

.

• 1

*

: indicates the duration from the occurrence of failure to the first ignition signal output.

• 2

*

: indicates the duration from the first collision judgment or non-ignition judgment to the present.

ACTUATOR TEST REFERENCE TABLE

M1524003600035

The diagnostic tool activates the following actuators 
for testing.

No.

DATA LIST ITEM

CHECK 
CONDITIONS

NORMAL CONDITIONS

01

Failure continuation time 1

*

Always

Maximum time to be stored: 9999 
minutes (approximately seven 
days)

02

Failure continuation time 2

*

Always

03

Elimination times

Always

Maximum time to be stored: 255 
days

09

Passenger seat Airbag Ignition

Do not apply any load 
to the passenger 
seat.

Permission/Prohibition

10

Driver’s Seat position switch

Slide the seat from 
the back-end position 
to the front-end 
position.  

Rear/Front

MUT-III diagnostic tool 
DISPLAY

ITEM NO.

ITEM

PARTS TO BE ACTIVATED

SRS Warning Lamp

01

The SRS warning light illuminates.

CAN output

SPECIAL TOOLS

SUPPLEMENTAL RESTRAINT SYSTEM (SRS)

52B-223

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

diagnostic 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 Daimler 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