Mitsubishi Outlander GS45X. Manual - part 1480

SRS AIR BAG DIAGNOSIS

TSB Revision

SUPPLEMENTAL RESTRAINT SYSTEM (SRS)

52B-415

Inspection procedure 3:The SRS Warning Light does not Illuminate.

IG1
RELAY

AC901209

ETACS-ECU

COMBINATION METER

FUSIBLE
LINK

34

CAN DRIVE
CIRCUIT

IGNITION
SWITCH (IG1)

INTERFACE
CIRCUIT

JOINT CONNECTOR
(CAN1)

SRS-ECU

SRS Warning Light Circuit

AC

CAN TRANSCEIVER 
CIRCUIT

LED DRIVE 
CIRCUIT

CPU

LCD (SRS)

RHEOSTAT

SRS AIR BAG DIAGNOSIS

TSB Revision

SUPPLEMENTAL RESTRAINT SYSTEM (SRS)

52B-416

.

CIRCUIT OPERATION

• The SRS warning light illuminates when the igni-

tion switch is turned to the "ON" position and 
goes out after approximately seven seconds if 
there is not a malfunction in the SRS system.

• SRS-ECU sends the SRS warning light signal to 

the combination meter via the CAN communica-
tion.

• As a cause, the failure of CAN bus line, combina-

tion meter, or SRS-ECU is suspected.

.

TROUBLESHOOTING HINTS

• Damaged wiring harness and connectors

• Combination meter malfunction

• Malfunction of SRS-ECU

DIAGNOSIS

Required Special Tools:

• MB991958: Scan Tool (M.U.T.-III Sub Assembly)

• MB991824: Vehicle Communication Interface (V.C.I.)

• MB991817: M.U.T.-III USB Cable

• MB991910: M.U.T.-III Main Harness A (Vehicles with 

CAN Communication System)

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

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.
Use scan tool MB991958 to diagnose the CAN bus lines.
(1) Connect scan 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 line (Refer to GROUP 54C, 

Diagnosis 

P.54C-17

).

AC901075 AC

Connector: C-03

ACA02655AF

Connector: C-317

ZC501967

AC404789

AC701411AB

MB991824

MB991827

MB991910

Data link 
connector

SRS AIR BAG DIAGNOSIS

TSB Revision

SUPPLEMENTAL RESTRAINT SYSTEM (SRS)

52B-417

STEP 2. Using scan tool MB991958, check actuator test
Check the SRS-ECU actuator tests.
Item No. 01: SRS warning light
Q: Does the SRS warning light turn on and off normally?

YES : Go to Step 3.
NO :  Replace SRS-ECU. (Refer to 

P.52B-436

.)

STEP 3. Using scan tool MB991958, check actuator test
Check the combination meter actuator tests.
Item No. 07: Indicator 1
Q: Does the SRS warning light turn on and off normally?

YES : Go to Step 4.
NO :  Replace the combination meter. (Refer to GROUP 

54A, Combination Meter 

P.54A-118

.)

STEP 4. Wiring harness inspection between C-317 
ETACS-ECU connector terminal No. 5 and C-03 
combination meter connector terminal No. 2 
NOTE: Prior to the wiring harness inspection, check the 
ETACS-ECU connectors C-317 and combination meter con-
nector C-03, and repair if necessary.

• The SRS warning light inspection for open and short circuit

Q: Is the check result normal?

YES : If other systems are normally operated, replace the 

combination meter. (Refer to GROUP 54A, 
Combination Meter 

P.54A-118

.)

NO :  Repair the wiring harness.

Inspection procedure 4: The SRS Warning Light does not Go Out.

.

CIRCUIT OPERATION

• The SRS warning light illuminates when the igni-

tion switch is turned to the "ON" position and 
goes out after approximately seven seconds if 
there is not a malfunction in the SRS system.

• SRS-ECU sends the SRS warning light signal to 

the combination meter via the CAN communica-
tion.

• As a cause, the failure of CAN bus line, combina-

tion meter, or SRS-ECU is suspected.

.

TROUBLESHOOTING HINTS

• Damaged wiring harness and connectors

• Combination meter malfunction

• Malfunction of SRS-ECU

DIAGNOSIS

Required Special Tools:

• MB991958: Scan Tool (M.U.T.-III Sub Assembly)

• MB991824: Vehicle Communication Interface (V.C.I.)

• MB991817: M.U.T.-III USB Cable

• MB991910: M.U.T.-III Main Harness A (Vehicles with 

CAN Communication System)

SRS AIR BAG DIAGNOSIS

TSB Revision

SUPPLEMENTAL RESTRAINT SYSTEM (SRS)

52B-418

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

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.
Use scan tool MB991958 to diagnose the CAN bus lines.
(1) Connect scan 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 line (Refer to GROUP 54C, 

Diagnosis 

P.54C-17

).

STEP 2. Recheck of the SRS warning light
(1) Connect the negative battery terminal.
(2) Ignition switch: ON
Q: Does the SRS warning light illuminate for approximately 

7 seconds and then go out after the ignition switch is 
turned to the "ON" position?
YES : There is an intermittent malfunction such as poor 

engaged connector(s) or open circuit (Refer to 
GROUP 00, How to Cope with Intermittent 
Malfunction 

P.00-15

).

NO :  Go to Step 3.

STEP 3. Using scan tool MB991958, check actuator test
Check the combination meter actuator tests.
Item No. 07: Indicator 1
Q: Does the SRS warning light turn on and off normally?

YES : Go to Step 4.
NO :  Replace the combination meter. (Refer to GROUP 

54A, Combination Meter 

P.54A-118

.)

ZC501967

AC404789

AC701411AB

MB991824

MB991827

MB991910

Data link 
connector