Mitsubishi Outlander GS45X. Manual - part 1420

SRS AIR BAG DIAGNOSIS

TSB Revision

SUPPLEMENTAL RESTRAINT SYSTEM (SRS)

52B-175

STEP 4. Recheck for diagnostic trouble code.
Check again if the DTC is set to the SRS-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 SRS-ECU (Refer to 

P.52B-436

).

NO :  There is an intermittent malfunction such as poor 

engaged connector(s) or open circuit (Refer to 
GROUP 00, How to use Troubleshooting/inspection 
Service Points 

P.00-15

).

DTC B1BC7: SRS-ECU (Record Data Full) System

CAUTION

If the diagnostic trouble code B1BC7 is set to 
SRS-ECU, always diagnose the CAN main bus 
line.

.

CIRCUIT OPERATION

If SRS-ECU determines that a collision has occurred, 
it sends the ignition current to deploy the air bag. It 
stores the deployment status. If this DTC is set, 
SRS-ECU determines that the air bag has been 
deployed.

.

DTC SET CONDITIONS

This DTC is set after the air bag deployment. If this 
DTC is set before the air bag is deployed, an internal 
failure may have occurred in SRS-ECU.

.

TROUBLESHOOTING HINTS

Malfunction of 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)

SRS AIR BAG DIAGNOSIS

TSB Revision

SUPPLEMENTAL RESTRAINT SYSTEM (SRS)

52B-176

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) Turn the ignition switch to the "ON" position.
(2) Check if the DTC is set.
(3) Turn the ignition switch to the "LOCK" (OFF) position.
Q: Are any "Stored" or "Active" DTC B1BC7 output?

YES : Replace the SRS-ECU (Refer to 

P.52B-436

).

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

ZC501967

AC404789

AC701411AB

MB991824

MB991827

MB991910

Data link 
connector

SRS AIR BAG DIAGNOSIS

TSB Revision

SUPPLEMENTAL RESTRAINT SYSTEM (SRS)

52B-177

DTC B1BCF: Roll Over Sensor Malfunction

 

DTC B2207: Occupant Restraint Controller Internal 1

 

DTC B2208: Occupant Restraint Controller Internal 2

 

DTC B2209: Occupant Restraint Controller Internal 3

 

DTC B220A: Occupant Restraint Controller Internal 4

 

DTC B220B: Occupant Restraint Controller Internal Firing Stored Energy

 

DTC B220C: Occupant Restraint Controller Accelerometer 1

 

DTC B220D: Occupant Restraint Controller Accelerometer 2

CAUTION

 If DTCs are set in the SRS-ECU, always diagnose 
the CAN main bus line.

.

TROUBLE JUDGMENT 

The above DTC is set if an abnormality is detected in the circuit 
inside the SRS-ECU.

.

TROUBLESHOOTING HINTS

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 

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

).

ZC501967

AC404789

AC701411AB

MB991824

MB991827

MB991910

Data link 
connector

SRS AIR BAG DIAGNOSIS

TSB Revision

SUPPLEMENTAL RESTRAINT SYSTEM (SRS)

52B-178

STEP 2. Recheck for diagnostic trouble code.
Check again if the DTC is set.
(1) Turn the ignition switch to the "ON" position.
(2) Check if the DTC is set.
(3) Turn the ignition switch to the "LOCK" (OFF) position.
Q: Are the DTCs output regardless of "Active" or "Stored" 

faults?
YES : Replace the SRS-ECU (Refer to 

P.52B-436

).

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 B1C27: Side-air bag Module (LH) (Squib) System (Shorted to Squib Circuit Ground)

ZC501967

AC404789

AC701411AB

MB991824

MB991827

MB991910

Data link 
connector

Side-Airbag Module (Squib) (LH) Circuit

SRS-ECU

CONNECTOR
LOCK SWITCH

: CONNECTOR 
  CONNECTED: ON
  CONNECTOR 
  DISCONNECTED: OFF

NOTE

SIDE-AIRBAG
MODULE
(SQUIB) (LH)

CONNECTOR
LOCK SWITCH