Mitsubishi Outlander GS45X. Manual - part 1478

SRS AIR BAG DIAGNOSIS

TSB Revision

SUPPLEMENTAL RESTRAINT SYSTEM (SRS)

52B-407

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.
(1) Connect scan tool MB991958. Refer to "How to connect the 

Scan Tool (M.U.T.-III) 

P.52B-28

."

(2) Turn the ignition switch to the "ON" position.
(3) Diagnose the CAN bus line.
(4) Turn the ignition switch to the "LOCK" (OFF) position.
Q: Is the CAN bus line found to be normal?

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

Diagnosis 

P.54C-17

).

STEP 2. Using scan tool MB991958, read the audio visual 
navigation unit diagnostic trouble code.
Check if DTC is set to the audio visual navigation unit.
Q: Is the DTC set?

YES : Diagnose the MMCS. Then go to Step 4.
NO :  Go to Step 3.

STEP 3. Using scan tool MB991958, read diagnostic 
trouble code No. U0245 for other system.
Check if the DTC U0245 is set in ETACS-ECU, combination 
meter, KOS-ECU or WCM, hands free module.
Q: Is the DTC set?

YES : Replace the CAN box unit (Refer to GROUP 54A, 

MMCS

P.54A-559

).

NO :  Go to Step 4.

ZC501967

AC404789

AC701411AB

MB991824

MB991827

MB991910

Data link 
connector

SRS AIR BAG DIAGNOSIS

TSB Revision

SUPPLEMENTAL RESTRAINT SYSTEM (SRS)

52B-408

STEP 4. Recheck for diagnostic trouble code.
Check again if the DTC is set to the occupant classifica-
tion-ECU.
(1) Erase the DTC.
(2) Turn the ignition switch from "LOCK" (OFF) position to "ON" 

position.

(3) Check if DTC is set.
(4) Turn the ignition switch to the "LOCK" (OFF) position.
Q: Is the DTC set?

YES : Replace the passenger seat cushion frame assembly 

(Refer to GROUP 52A, Front Seat Assembly 

P.52A-17

).

NO :  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

).

DTC U1419: The signal from a weight sensor (front: LH) is unusual

 

DTC U141A: The signal from a weight sensor (front: RH) is unusual

 

DTC U141B: The signal from a weight sensor (rear: LH) is unusual

 

DTC U141C: The signal from a weight sensor (rear: RH) is unusual

 

DTC U1423: The signal from a weight sensor is unusual

.

DTC SET CONDITIONS

There DTCs are set if communication between the 
weight sensor and the occupant classification-ECU is 
not possible or faulty.

.

TROUBLESHOOTING HINTS

• Malfunction of weight sensor

• The occupant classification-ECU may be defec-

tive

DIAGNOSIS

Required Special Tools:

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

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

• MB991827: 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-409

STEP 1. Recheck for diagnostic trouble code.
Check again if the DTC is set.
(1) Erase the DTC.
(2) Turn the ignition switch to the "ON" position.
(3) Check if the DTC is set.
(4) Turn the ignition switch to the "LOCK" (OFF) position.
Q: Is the DTC set?

YES : Go to Step 2.
NO :  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

).

STEP 2. Check the weight sensor.
Check the diagnostic trouble code.
Q: Is DTC U1419, U141A, U141B, U141C, U1423 set?

YES : Replace the passenger seat cushion frame assembly 

(Refer to GROUP 52A, Front Seat Assembly 

P.52A-17

).

NO :  The procedure is complete.

TROUBLE SYMPTOM CHART

M1524003401067

CAUTION

During diagnosis, a DTC code associated with 
another system may be set when the ignition 
switch is turned on with connector(s) discon-
nected. After completing the repair, confirm all 
systems for DTC code(s). If DTC code(s) are set, 
erase them all.

ZC501967

AC404789

AC701411AB

MB991824

MB991827

MB991910

Data link 
connector

SYMPTOM

INSPECTION PROCEDURE No. REFERENCE PAGE

Communication between the scan tool and the 
SRS-ECU is not possible.

1

P.52B-410

Power supply circuit system

2

P.52B-411

The SRS warning light does not illuminate.

3

P.52B-415

The SRS warning light does not go out.

4

P.52B-417

SRS AIR BAG DIAGNOSIS

TSB Revision

SUPPLEMENTAL RESTRAINT SYSTEM (SRS)

52B-410

SYMPTOM PROCEDURES

Inspection procedure 1: Communication between the Scan Tool and the SRS-ECU is not possible.

.

TECHNICAL DESCRIPTION (COMMENT)

If the scan tool (M.U.T.-III Sub Assembly) can not 
communicate with the SRS system, the CAN bus 
lines may be defective. If the SRS system does not 
work, the SRS-ECU or its power supply circuit may 
be defective. 

.

TROUBLESHOOTING HINTS (The most 
likely causes for this case:)

• Damaged wiring harness or connector

• Malfunction of the SRS-ECU

DIAGNOSIS

Required Special Tools:

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

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

• MB991827: 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.
(1) Connect scan tool MB991958. Refer to "How to connect the 

Scan Tool (M.U.T.-III) 

P.52B-28

."

(2) Turn the ignition switch to the "ON" position.
(3) Diagnose the CAN bus line.
(4) Turn the ignition switch to the "LOCK" (OFF) position.
Q: Is the CAN bus line found to be normal?

YES : Check and repair the power supply circuit system 

(Refer to 

P.52B-411

). 

NO :  Repair the CAN bus line (Refer to GROUP 54C, 

Diagnosis 

P.54C-17

).

ZC501967

AC404789

AC701411AB

MB991824

MB991827

MB991910

Data link 
connector