Mitsubishi Outlander GS45X. Manual - part 1422

SRS AIR BAG DIAGNOSIS

TSB Revision

SUPPLEMENTAL RESTRAINT SYSTEM (SRS)

52B-183

STEP 5. Check the harness wires for short circuit to 
ground between SRS-ECU connector C-27 (terminal No.31 
and 32) and side-air bag module (LH) connector D-29 
(terminal No.2 and 1).
Q: Is the check result normal? 

YES : Go to Step 6.
NO :  Repair the harness wires between SRS-ECU 

connector C-27 and side-air bag module (LH) 
connector D-29. Then go to Step 6. 

STEP 6. 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 DTC B1C27 set?

YES : Return to Step 1.
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-184

DTC B1C28: Side-air bag Module (LH) (Squib) System (Shorted to Squib Circuit Power Supply)

CAUTION

If DTC B1C28 is set in the SRS-ECU, always diag-
nose the CAN bus lines.

.

CIRCUIT OPERATION

• The SRS-ECU judges how severe a collision is 

by detecting signals from the side impact sensor 
installed on the lower side of the center pillar. If 
the impact is over a predetermined level, the 
SRS-ECU sends an ignition signal. At this time, if 
the side collision safing G-sensor is on, the SRS 
air bag will inflate.

• The ignition signal is input to the side-air bag 

module to inflate the side-air bag.

.

DTC SET CONDITIONS

This DTC is set if there is abnormal resistance 
between the input terminals of the side-air bag mod-
ule (LH) (squib).

.

TROUBLESHOOTING HINTS

• Damaged wiring harnesses or connectors

• Short to the power supply in the side-air bag 

module (LH) (squib) harness

• Malfunction of the SRS-ECU

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

AC901076

C-27 (Y)

AC

Connector: C-27

AC901079

D-29 (Y)

Connector: D-29

AE

SRS AIR BAG DIAGNOSIS

TSB Revision

SUPPLEMENTAL RESTRAINT SYSTEM (SRS)

52B-185

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)

• MB991865: Dummy resistor

• MB991866: Resister harness

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 "ON" position.
(3) Diagnose the CAN bus line.
(4) Turn the ignition switch to the "LOCK" (OFF) position.
Q: Is the check result satisfactory?

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-186

STEP 2. Recheck for diagnostic trouble code.
Check again if the DTC is set.
(1) Erase the DTC.
(2) Turn the ignition switch to "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. Check the side-air bag module (LH). (Using scan 
tool MB991958, read the diagnostic trouble code.)
(1) Disconnect the negative battery terminal.
(2) Disconnect the D-29 side-airbag module connector, unlock 

the connector by sliding the locking button to the direction of 
the arrow as shown in the figure, and then disconnect the 
connector.

(3) Connect special tool MB991865 to special tool MB991866.

CAUTION

Do not insert a test probe into the terminal from its front 
side directly, as the connector contact pressure may be 
weakened.
(4) Insert special tool MB991866 into the D-29 harness side 

connector by backprobing.

(5) Connect the negative battery terminal.
(6) Erase the diagnostic trouble code memory, and check the 

diagnostic trouble code.

Q:  Is DTC B1C28 set?

YES : Go to Step 4.
NO :  Replace the seatback assembly (Refer to GROUP 

52A, Front Seat Assembly 

P.52A-19

). Then go to 

Step 6.

ZC501967

AC404789

AC701411AB

MB991824

MB991827

MB991910

Data link 
connector

AC706606

AI

Locking button

Side-airbag 

module

connector

AC507310AF

D-29 

Side-airbag 

module (RH) connector

D-29 
Harness side 
connector

MB991865
(Dummy resistor: 3    )

MB991866 

(Resistor harness)