Mitsubishi Outlander (2003+). Manual - part 363

TROUBLESHOOTING

SUPPLEMENTAL RESTRAINT SYSTEM (SRS)

52B-51

DIAGNOSIS PROCEDURE

STEP 1. Check the driver's seat belt 
pre-tensioner. (Check whether the diagnosis 
code is reset.)
(1) Disconnect the negative battery terminal.

(2) Disconnect driver's seat belt pre-tensioner 

connector D-43. Use a flat-tipped screwdriver to 
pull out the locking button at the harness side 
connector, and then disconnect the connector.

(3) Connect special tool dummy resistor (MB991865) 

to special tool resistor harness (MB991884).

(4) Connect special tool (MB991884) to the D-43 

harness side connector.

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

the diagnosis code.

Q: Is diagnosis code 27 set?

YES : 

Go to Step 2.

NO : 

Replace the driver's seat belt pre-tensioner 
(Refer to 

P.52B-188

). Then go to Step 4.

STEP 2. Measure the resistance between 
SRS-ECU connector C-114 (terminal No.29 and 
30) and the driver's seat belt pre-tensioner D-43 
(terminal No.1 and 2).

(1) Disconnect SRS-ECU connector C-114 and 

driver's seat belt pre-tensioner connector D-43, 
and measure at the wiring harness side. For 
connector D-43, use a flat-tipped screwdriver to 
pull out the locking button at the harness side 
connector, and then disconnect the connector.

AC308785

Connector: D-43

AG

Harness side

D-43 (B)

AC300147AF

Flat-tip screw
driver

Locking button

D-43 Passenger's

seat belt

pre-tensioner 

connector

D-43 Harness side connector

MB991884
MB991885

AC300975AE

MB991865
(Dummy resistor : 3 

Ω)

MB991884
(Resistor
harness)

D-43 Harness side connector

AC301661

Connector: C-114

AE

SRS-ECU

C-114 (Y)

Center lower
panel

Harness side
connector 
(front view)

40

23

24

41

32

42

33

31

29
38

39

30

37

28

21

22

35

26

36

27

34

25

AC308785

Connector: D-43

AG

Harness side

D-43 (B)

AC300147AF

Flat-tip screw
driver

Locking button

D-43 Passenger's

seat belt

pre-tensioner 

connector

D-43 Harness side connector

TROUBLESHOOTING

SUPPLEMENTAL RESTRAINT SYSTEM (SRS)

52B-52

(2) Connect D-43 harness side connector to special 

tool resistor harness (MB991884).

CAUTION

Do not insert a test probe into the terminal from 
its front side directly as the connector contact 
pressure may be weakened.
(3) Measure the resistance between the following 

terminals.

•

SRS-ECU connector C-114 terminal No.29 
and special tool terminal No.1

•

SRS-ECU connector C-114 terminal No.30 
and special tool terminal No.2

OK: Less than 2 

Ω

Q: Are the check results normal?

YES : 

Erase the diagnosis code memory, and 

recheck if any diagnosis code sets. If 
diagnosis code 27 sets, replace the 
SRS-ECU (Refer to 

P.52B-178

). Then go to 

Step 4.

NO : 

Go to Step 3.

STEP 3. Connector check: SRS-ECU connector 
C-114 and driver’s seat belt pre-tensioner 
connector D-43

Q: Is the check result normal?

YES : 

Check the harness wires for open circuit 

between SRS-ECU connector C-114 
(terminal No.29 and 30) and driver’s seat 
belt pre-tensioner connector D-43 (terminal 
No.2 and 1), and repair if necessary. Then 
go to Step 4.

NO : 

Repair or replace it. Then go to Step 4.

STEP 4. Check whether the diagnosis code is 
reset.

Q: Is diagnosis code No.27 set?

YES : 

Return to Step 1.

NO : 

The procedure is complete (If no 
malfunctions are found in all steps, an 
intermittent malfunction is suspected. Refer 
to GROUP 00 

−

 How to Use 

Troubleshooting/Inspection Service Points 

P.00-6

).

AC201287AK

D-43 

Harness side
connector

MB991884

34 35 36 37 38 39 40 41 42

25 26 27 28 29 30 31 32 33

21 22

23 24

2

1

AC300989AB

C-114 Harness
side connector
(rear view)

Special tool
MB991884

AC301661

Connector: C-114

AE

SRS-ECU

C-114 (Y)

Center lower
panel

Harness side
connector 
(front view)

40

23

24

41

32

42

33

31

29
38

39

30

37

28

21

22

35

26

36

27

34

25

AC308785

Connector: D-43

AG

Harness side

D-43 (B)

TROUBLESHOOTING

SUPPLEMENTAL RESTRAINT SYSTEM (SRS)

52B-53

Code No.28: Passenger's (front) seat belt pre-tensioner (squib) system (short-circuit between 
terminals of the squib circuit) <L.H. drive vehicles>

OPERATION
The SRS-ECU judges how severe a collision is by 
detecting signals from the front impact sensors and 
the front air bag analog G-sensor. If the impact is 
over a predetermined level, the SRS-ECU outputs an 
ignition signal. At this time, if the front air bag safing 
G-sensor is on, the pre-tensioner will deploy.

DIAGNOSIS CODE SET CONDITIONS
This diagnosis code is set if one passenger’s seat 
belt pre-tensioner squib wire shorted to the other.

PROBABLE CAUSES

•

Improper engaged connector or defective short 
spring*

•

Short circuit between the passenger's seat belt 
pre-tensioner (squib) circuit terminals

•

Damaged connector(s)

•

Malfunction of the SRS-ECU

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 earth wire in the 
squib circuit when the connectors are disconnected). 
Therefore, if connector C-114 or D-43 is damaged or 
improperly engaged, the short spring may not be 
released when the connector is connected.

AIR BAG DRIVE 
CIRCUIT

CONNECTOR
LOCK
SWITCH

NOTE

CONNECTOR
COUPLED: ON
CONNECTOR
UNCOUPLED: OFF

CONNECTOR
LOCK
SWITCH

MICROCOMPUTER

SRS-ECU

Wire colour code
B : Black     LG : Light green
G : Green     L : Blue      
W : White     Y : Yellow
SB : Sky blue     BR : Brown 
O : Orange     GR : Gray  
R : Red     P : Pink     V : Violet       

SEAT BELT 
PRE-TENSIONER 
(RH)

AC301795

Passenger's (Front) Seat Belt Pre-tensioner (Squib)

AB

TROUBLESHOOTING

SUPPLEMENTAL RESTRAINT SYSTEM (SRS)

52B-54

DIAGNOSIS PROCEDURE

STEP 1. MUT-II/III diagnosis code

CAUTION

To prevent damage to MUT-II, always turn the 
ignition switch to the "LOCK" (OFF) position 
before connecting or disconnecting MUT-II.
(1) Turn the ignition switch to the "ON" position.
(2) Check if the diagnosis code is set.
(3) Turn the ignition switch to the "LOOK" (OFF) 

position.

Q: Is diagnosis code 34 set?

YES : 

Go to Step 2.

NO : 

Go to Step 3.

STEP 2. Connector check: SRS-ECU connector 
C-114

Q: Is connector correctly engaged?

YES : 

Go to Step 3.

NO : 

Engage the connector correctly. Then go to 
Step 7.

STEP 3. Connector check: SRS-ECU connector 
C-114 and passenger’s seat belt pre-tensioner 
connector D-43 (Check whether the diagnosis 
code is reset.)
(1) Disconnect the negative battery terminal.

(2) Disconnect connectors C-114 and D-43, and then 

reconnect them. For connector D-43, use a 
flat-tipped screwdriver to pull out the locking 
button at the harness side connector, and then 
disconnect the connector.

(3) Connector the negative battery terminal.
(4) Erase the diagnosis code memory, and check the 

diagnosis code.

Q: Is diagnosis code 28 set?

YES : 

Go to Step 4.

NO : 

The procedure is complete. It is assumed 
that diagnosis code 28 set as connector 
C-114 or D-43 was engaged improperly.

AC301661

Connector: C-114

AE

SRS-ECU

C-114 (Y)

Center lower
panel

Harness side
connector 
(front view)

40

23

24

41

32

42

33

31

29
38

39

30

37

28

21

22

35

26

36

27

34

25

AC301661

Connector: C-114

AE

SRS-ECU

C-114 (Y)

Center lower
panel

Harness side
connector 
(front view)

40

23

24

41

32

42

33

31

29
38

39

30

37

28

21

22

35

26

36

27

34

25

AC301408AI

Connector: D-43

Harness side
connector
(front view)

1

2

AC300147AF

Flat-tip screw
driver

Locking button

D-43 Passenger's

seat belt

pre-tensioner 

connector

D-43 Harness side connector