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