Mitsubishi Outlander GS45X. Manual - part 1418

SRS AIR BAG DIAGNOSIS

TSB Revision

SUPPLEMENTAL RESTRAINT SYSTEM (SRS)

52B-167

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. Check the side impact sensor. (Using scan tool 
MB991958, read the diagnostic trouble code.)
(1) Disconnect the negative battery terminal.
(2) A side impact sensor is checked in the following way.

• Replace the side impact sensor (front) (LH) {In case of 

code B1B72 (Regardless of "Active" or "Stored" faults)} 
with the new part.

• Replace the side impact sensor (front) (RH) {In case of 

code B1B75 (Regardless of "Active" or "Stored" faults)} 
with the new part.

(3) Connect the negative battery terminal.
(4) After erasing the diagnostic trouble code memory, check the 

diagnostic trouble code again.

Q: Is either DTC B1B72 or B1B75 set?

YES : Go to Step 3.
NO :  The procedure is complete.

ZC501967

AC404789

AC701411AB

MB991824

MB991827

MB991910

Data link 
connector

SRS AIR BAG DIAGNOSIS

TSB Revision

SUPPLEMENTAL RESTRAINT SYSTEM (SRS)

52B-168

STEP 3. Check the SRS-ECU (Using scan tool MB991958, 
read the diagnostic trouble code.)
(1) Disconnect the negative battery terminal.
(2) Replace the SRS-ECU with a new one. (Refer to 

P.52B-436

).

(3) Connect the negative battery terminal.
(4) Check the diagnostic trouble code again.
Q: Is either DTC B1B72 or B1B75 set?

YES : Return to Step 1.
NO :  The procedure is complete.

DTC B1B73: Malfunction of G-sensor Inside Side Impact Sensor (Rear) (LH)

 

DTC B1B76: Malfunction of G-sensor Inside Side Impact Sensor (Rear) (RH)

CAUTION

If DTC B1B73 or B1B76 is set in the SRS-ECU, 
always diagnose the CAN main bus line.

.

DTC SET CONDITIONS

These DTCs are set if the following conditions are 
detected from the analog G-sensor inside the side 
impact sensor output:

• Analog G-sensor is not operating.

• Analog G-sensor characteristics are abnormal.

• Analog G-sensor output is abnormal.

.

TROUBLESHOOTING HINTS

Malfunction of side impact sensor (rear) (LH) (for 
DTC B1B73) and impact sensor (rear) (RH) (for DTC 
B1B76)

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-169

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. Check the side impact sensor. (Using scan tool 
MB991958, read the diagnostic trouble code.)
(1) Disconnect the negative battery terminal.
(2) A side impact sensor is checked in the following way.

• Replace the side impact sensor (rear) (LH) {In case of 

code B1B73 (Regardless of "Active" or "Stored" faults)} 
with the new part.

• Replace the side impact sensor (rear) (RH) {In case of 

code B1B76 (Regardless of "Active" or "Stored" faults)} 
with the new part.

(3) Connect the negative battery terminal.
(4) After erasing the diagnostic trouble code memory, check the 

diagnostic trouble code again.

Q: Is either DTC B1B73 or B1B76 set?

YES : Go to Step 3.
NO :  The procedure is complete.

ZC501967

AC404789

AC701411AB

MB991824

MB991827

MB991910

Data link 
connector

SRS AIR BAG DIAGNOSIS

TSB Revision

SUPPLEMENTAL RESTRAINT SYSTEM (SRS)

52B-170

STEP 3. Check the SRS-ECU (Using scan tool MB991958, 
read the diagnostic trouble code.)
(1) Disconnect the negative battery terminal.
(2) Replace the SRS-ECU with a new one. (Refer to 

P.52B-436

).

(3) Connect the negative battery terminal.
(4) Check the diagnostic trouble code again.
Q: Is either DTC B1B73 or B1B76 set?

YES : Return to Step 1.
NO :  The procedure is complete.

DTC B1BA3: Driver’s Seat Slide Sensor Malfunction (Occupant Classification-ECU)

 

DTC B1BA4: Passenger’s Seat Slide Sensor Malfunction (Occupant Classification-ECU)

CAUTION

If DTC B1BA3 or B1BA4 is set in the Occupant 
classification-ECU, always diagnose the CAN 
main bus line.

.

DTC SET CONDITION

These DTCs are set if communication between the 
occupant classification-ECU and the seat slide sen-
sor is not possible or communication is faulty.

.

TROUBLESHOOTING HINTS

• Malfunction of the seat slide sensor

• Malfunction of occupant classification-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)