Mitsubishi Grandis. Manual - part 1038

TROUBLESHOOTING

SUPPLEMENTAL RESTRAINT SYSTEM (SRS)

52B-204

STEP 2. Check the harness wires for short circuit 
to earth between SRS-ECU connector C-119 
(terminal No.23 and 24) and ignition switch 
connector C-307 (terminal No.2).

NOTE: 

AC311438 AD

C-119 (Y)

Connector: C-119

Harness side
(front view)

AC313147AD

Connector: C-307 <LHD>

C-307

2
5

4

1

6

3

AC313148

AD

Connector: C-307<RHD>

C-307

2
5

4

1

6

3

TROUBLESHOOTING

SUPPLEMENTAL RESTRAINT SYSTEM (SRS)

52B-205

After inspecting intermediate connectors C-202, 
C-01 <LHD>, C-33 <RHD> and C-205 inspect the 
wiring harness. If intermediate connectors C-202, 
C-01 <LHD>, C-33 <RHD> and C-205 are damaged, 
repair or replace them. Then go to Step 3  .

Q: Are the harness wires between SRS-ECU 

connector C-119 (terminal No.23 and 24) and 
ignition switch connector C-307 (terminal No.2) in 
good condition?
YES : 

Go to Step 3 .

NO : 

Replace the harness wires between 
SRS-ECU connector C-119 and ignition 
switch connector C-307. Then go to Step 3 .

STEP 3. Retest the system.

Q: Can the SRS-ECU communicate with the MUT-III?

YES : 

It can be assumed that this malfunction is 

intermittent. Refer to GROUP 00, How to 
Use Troubleshooting/Inspection Service 
Points 

− How to Cope with Intermittent 

Malfunction 

P.00-5

.

NO : 

Replace the SRS-ECU (Refer to 

P.52B-223

). 

AC310613

AE

Connector: C-01 <LHD>

AC310631BD

Connector: C-33 <RHD>

AC310624

Connectors: C-202, C-205 <LHD>

AF

Junction block (Front view)

C-205

C-202

C-205

Harness side

C-202

Harness side

AC310619

Connectors: C-202, C-205 <RHD>

AF

Junction block (Front view)

C-205

C-202

C-205

Harness side

C-202

Harness side

TROUBLESHOOTING

SUPPLEMENTAL RESTRAINT SYSTEM (SRS)

52B-206

Inspection Procedure 3: When the Ignition Switch 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.

Wire colour code
B : Black     LG : Light green     G : Green     L : Blue     W : White     Y : Yellow     SB : Sky blue
BR : Brown     O : Orange     GR : Gray     R : Red     P : Pink     V : Violet

FUSIBLE
LINK

FUSIBLE
LINK

COMBINATION
METER

DIAGNOSIS
CONNECTOR

RELAY
BOX

26

30

SRS-ECU

FRONT SIDE

<LH drive vehicles>

SRS MAINTENANCE

SUPPLEMENTAL RESTRAINT SYSTEM (SRS)

52B-207

TECHNICAL DESCRIPTION (COMMENT)

• The SRS-ECU sends the SRS warning lamp 

signal to the combination meter via the CAN 
communication.

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

the combination meter or the SRS-ECU.

PROBABLE CAUSES

• Damaged wiring harness or connector

• Combination meter defect 

• Malfunction of the SRS-ECU

DIAGNOSIS PROCEDURE

STEP 1. MUT-III CAN bus diagnostics
Use the MUT-III to diagnose the CAN bus lines.

Q: Is the check result normal?

YES : 

Replace the SRS-ECU. (Refer 

to

P.52B-223

).

NO : 

Repair the CAN bus lines (Refer to GROUP 
54D, Diagnosis 

P.54D-16

).

DATA LIST REFERENCE TABLE

M1524003500050

The following items can be read by the MUT-III from 
the ABS-ECU input data.

ACTUATOR TEST REFERENCE TABLE

M1524003600057

The MUT-III activates the following actuators for 
testing.

FAIL-SAFE FUNCTION

M1524003700043

If the SRS-ECU determines that the following parts 
are defective, the SRS-ECU operates the SRS 
warning lamp and controls as follows.

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

determines that the seat is in its backward 
position and controls the air bag. 

• When the passenger’s air bag cut off switch is 

defective, control the air bag by turning the 
passenger’s air bag cut off switch air bag ON 
position.

SRS MAINTENANCE

M1524003900371

The SRS must be inspected by an authorized dealer 

10 years after the date of vehicle registration.

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

Seat position

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

Rear/Front

04

Passenger seat Airbag Ignition

Do not apply any load 
to the passenger 
seat.

Permission/Prohibition

10

Elimination times

Always

Maximum time to be stored: 255 
days

MUT-III MUT-III display

ItemNo.

Item

Parts to be activated

SRS Warning Lamp

01

The SRS warning lamp illuminates. CAN output

P/Seat belt Warning 
Lamp Cut Off

03

Passenger’s air bag OFF indicator 
light illumination

SRS-ECU output