Mitsubishi Outlander GS45X. Manual - part 1425

SRS AIR BAG DIAGNOSIS

TSB Revision

SUPPLEMENTAL RESTRAINT SYSTEM (SRS)

52B-195

NOTE:  *: The squib circuit connectors integrate a 
"short" spring (which prevents the air bag from 
deploying unintentionally due to static electricity by 
shorting the positive wire to the ground wire in the 
squib circuit when the connectors are disconnected). 
Therefore, if connector C-27 or D-29 is damaged or 
improperly engaged, the short spring may not be 
released when the connector is connected.

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) Connect scan tool MB991958 to the data link connector.
(3) Turn the ignition switch to "ON" position.
(4) Diagnose the CAN bus line.
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-196

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 SRS-ECU connector C-27 and side-air bag 
module (LH) connector D-29. (Using scan tool MB991958, 
read the diagnostic trouble code.)
(1) Disconnect the negative battery terminal.
(2) While pressing the part A in the illustration of the C-27 

SRS-ECU harness side connector, turn the lock lever 
toward the arrow direction to release the lock lever. Then, 
disconnect the connector and reconnect it.

(3) Disconnect the D-29 side-airbag module connector, and 

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

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

diagnostic trouble code.

Q: Is DTC B1C2A out put?

YES : Go to Step 4.
NO :  The procedure is complete. It is assumed that DTC 

B1C2A set because connector C-27 or D-29 was 
engaged improperly.

ZC501967

AC404789

AC701411AB

MB991824

MB991827

MB991910

Data link 
connector

AC507645

A

AC

Lock lever

AC706606

AI

Locking button

Side-airbag 

module

connector

SRS AIR BAG DIAGNOSIS

TSB Revision

SUPPLEMENTAL RESTRAINT SYSTEM (SRS)

52B-197

STEP 4. 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 diagnostic trouble code memory, and check the 

diagnostic trouble code. 

Q: Is DTC B1C2A set?

YES : Go to Step 5.
NO :  Replace the seatback assembly (Refer to GROUP 

52A, Front Seat Assembly 

P.52A-19

). Then go to 

Step 7.

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)

SRS AIR BAG DIAGNOSIS

TSB Revision

SUPPLEMENTAL RESTRAINT SYSTEM (SRS)

52B-198

STEP 5. Check the side-air bag module (LH) circuit. 
Measure the resistance at the SRS-ECU connector C-27.
(1) Disconnect the negative battery terminal.
(2) While pushing the part "A" indicated in the figure of the 

harness side connector, turn the lock lever to the direction 
of the arrow to release the lock lever, and disconnect the 
C-27 SRS-ECU connector.

DANGER

To prevent the air bag from deploying unintentionally, 
disconnect the side-airbag module (LH) connector 
D-29 to short the squib circuit.

(3) 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.

CAUTION

Insert an insulator such as a cable tie to a depth of 4mm 
(0.16 inch) or more, otherwise the short spring will not be 
released.
(4) Insert a cable tie [3 mm (0.12 inch) wide, 0.5 mm (0.02 inch) 

thick] between terminals 31, 32 and the short spring to 
release the short spring.

(5) Check for continuity between C-27 harness side connector 

terminals 31 and 32.
It should be an open circuit.

Q: Is it open circuit? 

YES : Erase the diagnostic trouble code memory, and check 

the diagnostic trouble code. If DTC B1C2A sets, 
replace the SRS-ECU. (Refer to 

P.52B-436

). Then go 

to Step 7. 

NO :  Go to Step 6. 

AC507645

A

AC

Lock lever

AC706606

AI

Locking button

Side-airbag 

module

connector

AC507303AK

A

A

C-27 Harness side
connector (front view)

Section
A - A

Cable tie

Short spring

4 mm or more

Terminal

AC608812

C-27 Harness side 
connector (front view)

CU