Mitsubishi Outlander GS45X. Manual - part 1476

SRS AIR BAG DIAGNOSIS

TSB Revision

SUPPLEMENTAL RESTRAINT SYSTEM (SRS)

52B-399

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 A/C 
diagnostic trouble code.
Check if DTC is set to the A/C-ECU.
Q: Is the DTC set?

YES : Diagnose the A/C. Then go to Step 4.
NO :  Go to Step 3.

STEP 3. Using scan tool MB991958, read diagnostic 
trouble code No. U0164 for other system.
Check if the DTC U0164 is set in ETACS-ECU, SRS-ECU, 
combination meter, KOS-ECU or WCM, hands free module, 
CAN box unit, radio and CD player, satellite radio tuner.
Q: Is the DTC set?

YES : Replace the A/C-ECU (Refer to GROUP 55A, 

A/C-ECU 

P.55A-124

).

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-400

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 U0168: KOS-ECU or WCM CAN Timeout

CAUTION

• If DTC U0168 is set in the occupant classifica-

tion-ECU, always diagnose the CAN main bus 
lines.

• When replacing the ECU, always check that 

the communication circuit is normal.

.

DIAGNOSTIC FUNCTION

If the signal from KOS-ECU or WCM cannot be 
received, the occupant classification-ECU sets the 
DTC U0168.

.

JUDGMENT CRITERIA

Because of the CAN-B bus circuit malfunction, if the 
occupant classification-ECU becomes unable to per-
form the normal data transmission, the occupant 
classification-ECU determines that an abnormality is 
present.

.

TROUBLESHOOTING HINTS

• Malfunction of CAN bus line may be defective.

• Malfunction of the KOS-ECU may be defective.

• Malfunction of the WCM may be defective.

• Malfunction of the occupant classification-ECU 

may be defective.

DIAGNOSIS

Required Special Tools:

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

• MB991824: Vehicles 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-401

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 KOS-ECU or 
WCM diagnostic trouble code.
Check again if the DTC is set to the KOS-ECU or WCM.
Q: Is the DTC set?

YES : Diagnose the KOS or WCM. Then go to Step 4.
NO :  Go to Step 3.

STEP 3. Using scan tool MB991958, read diagnostic 
trouble code No. U0168 for other system.
Check if the DTC U0168 is set in ETACS-ECU, SRS-ECU, 
combination meter, A/C-ECU, hands free module, CAN box 
unit, radio and CD player, satellite radio tuner.
Q: Is the DTC set?

YES : Replace the KOS -ECU (Refer to GROUP 42B, 

KOS-ECU 

P.42B-201

) or WCM (Refer to GROUP 

42C, WCM 

P.42C-114

 )

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-402

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 U0184: Audio CAN Timeout

CAUTION

• If the DTC U0184 is set in the occupant classi-

fication-ECU, always diagnose the CAN main 
bus lines.

• When replacing the ECU, always check that 

the communication circuit is normal.

.

DIAGNOSTIC FUNCTION

When the signals from radio and CD player or CD 
changer cannot be received, the occupant classifica-
tion-ECU sets the DTC U0184.

.

JUDGMENT CRITERIA

Because of the CAN-B bus circuit malfunction, if 
occupant classification-ECU becomes unable to per-
form the normal data transmission, occupant classifi-
cation-ECU determines that an abnormality is 
present.

.

TROUBLESHOOTING HINTS

• The CAN bus line may be defective

• The radio and CD player or CD changer may be 

defective

• The occupant classification-ECU may be defec-

tive

DIAGNOSIS

Required Special Tools:

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

• MB991824: Vehicles 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)