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