Mitsubishi Outlander (2003+). Manual - part 365

TROUBLESHOOTING

SUPPLEMENTAL RESTRAINT SYSTEM (SRS)

52B-59

STEP 4. Check the passenger's seat belt 
pre-tensioner. (Check whether the diagnosis 
code is reset.)
(1) Disconnect the negative battery terminal.

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

connector D-29. 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-29 

harness side connector.

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

the diagnosis code.

Q: Is diagnosis code 28 set?

YES : 

Go to Step 5.

NO : 

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

P.52B-188

). Then 

go to Step 7.

STEP 5. Measure the resistance at the SRS-ECU 
connector C-114.

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

DANGER

To prevents the air bag from deploying 
unintentionally, disconnect the passenger’s 
seat belt pre-tensioner connector D-29 to 
short the squib circuit.

AC308787

Connector: D-29

AE

1

2

Harness side

D-29 (B)

AC300147AE

Flat-tip screw
driver

Locking button

D-29 Driver's seat 
belt pre-tensioner 
connector

D-29 Harness side connector

MB991884
MB991885

AC300975AD

MB991865
(Dummy resistor : 3 

Ω)

MB991884
(Resistor
harness)

D-29 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

AC308787

Connector: D-29

AE

1

2

Harness side

D-29 (B)

TROUBLESHOOTING

SUPPLEMENTAL RESTRAINT SYSTEM (SRS)

52B-60

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

connector D-29. Use a flat-tipped screwdriver to 
pull out the locking button at the harness side 
connector, and then disconnect the connector.

CAUTION

Insert an insulator such as a cable tie to a depth 
of 4 mm or more, otherwise the short bar will not 
be released.
(3) Insert a cable tie [3 mm wide, 0.5 mm thick] 

between terminals 27, 28 and the short bar to 
release the short spring.

CAUTION

Do not insert a test probe into the terminal from 
its front side directly as the connector contact 
pressure may be weakened.
(4) Measure the resistance between C-114 harness 

side connector terminals 27 and 28.

OK: Open circuit.

Q: Is the check result normal?

YES : 

Erase the diagnosis code memory, and 

check diagnosis code. If diagnosis code 28 
sets, replace the SRS-ECU (Refer to 

P.52B-178

). Then go to Step 7 .

NO : 

Go to Step 6.

AC300147AE

Flat-tip screw
driver

Locking button

D-29 Driver's seat 
belt pre-tensioner 
connector

D-29 Harness side connector

AC300994

AB

AB

A

A

C-114 Harness side
connector (front view)

Terminal

Cable tie

Short bar

4 mm or more

Section
A - A

34 35 36 37 38 39 40 41 42

25 26 27 28 29 30 31 32 33

21 22

23 24

AC300996AB

C-114 Harness side
connector (rear view)

TROUBLESHOOTING

SUPPLEMENTAL RESTRAINT SYSTEM (SRS)

52B-61

STEP 6. Connector check: SRS-ECU connector 
C-114, passenger’s seat belt pre-tensioner 
connector D-29 and intermediate connector D-44

Q: Is the check result normal?

YES : 

Check the harness wires for short circuit 

between SRS-ECU connector C-114 
(terminal No.27 and 28) and passenger’s 
seat belt pre-tensioner connector D-29 
(terminal No.2 and 1), and repair if 
necessary. Then go to Step 7.

NO : 

Repair or replace it. Then go to Step 7.

STEP 7. Check whether the diagnosis code is 
reset.

Q: Is diagnosis code 28 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

).

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

AC308787

Connector: D-29

AE

1

2

Harness side

D-29 (B)

AC308785

Connector: D-44

AF

Harness side

D-44 (B)

TROUBLESHOOTING

SUPPLEMENTAL RESTRAINT SYSTEM (SRS)

52B-62

Code No.29: Passenger's (front) seat belt pre-tensioner (squib) system (open-circuited in 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 the passenger's seat belt 
pre-tensioner squib wire(s) are open-circuited.

PROBABLE CAUSES

•

Open circuit in the passenger's seat belt 
pre-tensioner (squib) circuit

•

Improper connector contact

•

Malfunction of the SRS-ECU

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