Mitsubishi Outlander GS45X. Manual - part 1470

SRS AIR BAG DIAGNOSIS

TSB Revision

SUPPLEMENTAL RESTRAINT SYSTEM (SRS)

52B-375

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 

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. 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 B1BA7 set?

YES : After executing zero calibration of the occupant 

classification-ECU, execute 30 Kg (66 pounds) 
system and 0 Kg (0 pound) system. Then go to Step 
3.

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

).

ZC501967

AC404789

AC701411AB

MB991824

MB991827

MB991910

Data link 
connector

SRS AIR BAG DIAGNOSIS

TSB Revision

SUPPLEMENTAL RESTRAINT SYSTEM (SRS)

52B-376

STEP 3. 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 B1BBA: Passenger Seat Weight Sensor Power Supply Circuit

CAUTION

If DTC B1BBA is set in the occupant classifica-
tion-ECU, always diagnose the CAN main bus 
lines.

.

CIRCUIT OPERATION

The load data from the weight sensor is classified 
with the occupant classification-ECU, and its classi-
fied information is send to SRS-ECU by CAN bus 
line. The SRS-ECU determines the air bag deploy-
ment based on this classified information, and con-
trols the power supply circuit to the inflator. 

.

DTC SET CONDITIONS

This DTC is set if the weight sensor power supply 
line is defective.

.

TROUBLESHOOTING HINTS

• The weight sensor may be defective.

• The occupant classification-ECU may be defec-

tive.

• The wiring harness or connectors may have 

loose, corroded, or damaged terminals, or termi-
nals pushed back in the connector

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-377

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 

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. 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 3.
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 3. Using scan tool MB991958,read the occupant 
classification-ECU diagnostic trouble code.
Check if the DTC B210D or B210E is set the occupant classifi-
cation-ECU.
Q: Is the DTC B1B78, B1B7D, B1B82 or B1B87 set?

YES : Diagnose the occupant classification-ECU (Refer to 

P.52B-344

).

NO :  Replace the passenger seat cushion frame assembly 

(Refer to GROUP 52A, Front Seat Assembly 

P.52A-17

).

ZC501967

AC404789

AC701411AB

MB991824

MB991827

MB991910

Data link 
connector

SRS AIR BAG DIAGNOSIS

TSB Revision

SUPPLEMENTAL RESTRAINT SYSTEM (SRS)

52B-378

DTC B1BBC: Occupant Classification System Negative System Weight

CAUTION

If DTC B1BBC is set in the occupant classifica-
tion-ECU, always diagnose the CAN main bus 
lines.

.

CIRCUIT OPERATION

The load data from the weight sensor is classified 
with the occupant classification-ECU, and its classi-
fied information is send to SRS-ECU by CAN bus 
line. The SRS-ECU determines the air bag deploy-
ment based on this classified information, and con-
trols the power supply circuit to the inflator. 

.

DTC SET CONDITION

This DTC is set if the passenger seat weight is 

−15 

Kg (

−35 pound) or less.

.

TROUBLESHOOTING HINTS

An object is caught in between the passenger seat and floor.

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. Check for an object caught in between the 
passenger seat and floor.
Q: Is the check result normal?

YES : Go to Step 2.
NO :  It corrects.