Mitsubishi Outlander (2003+). Manual — part 362

TROUBLESHOOTING

SUPPLEMENTAL RESTRAINT SYSTEM (SRS)

52B-47

Code No.27: Driver's 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 driver's seat belt
pre-tensioner squib wire(s) are open-circuited.

PROBABLE CAUSES

•

Improper connector contact

•

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

•

Malfunction of the SRS-ECU

SEAT BELT
PRETENSIONER
(LH)

CONNECTOR
LOCK
SWITCH

AIR BAG
DRIVE CIRCUIT

NOTE

CONNECTOR
COUPLED: ON
CONNECTOR
UNCOUPLED: OFF

SRS-ECU

MICROCOMPUTER

CONNECTOR
LOCK
SWITCH

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

AC301789AB

Driver's Seat Belt Pre-Tensioner (Squib)

TROUBLESHOOTING

SUPPLEMENTAL RESTRAINT SYSTEM (SRS)

52B-48

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-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 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-29
(terminal No.1 and 2).

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

driver's seat belt pre-tensioner connector D-29,
and measure at the wiring harness side. For
connector D-29, use a flat-tipped screwdriver to
pull out the locking button at the harness side

AC301410

Connector: D-29

AI

1

2

Harness side
connector
(front view)

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

AC301410

Connector: D-29

AI

1

2

Harness side
connector
(front view)

AC300147AE

Flat-tip screw
driver

Locking button

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

D-29 Harness side connector

TROUBLESHOOTING

SUPPLEMENTAL RESTRAINT SYSTEM (SRS)

52B-49

connector, and then disconnect the connector.

(2) Connect D-29 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, driver’s seat belt pre-tensioner connector
D-29 and intermediate connector D-31

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-29 (terminal
No.2 and 1), and repair if necessary. Then
go to Step 4.

NO :

Repair or replace it. Then go to Step 4.

AC201287AJ

D-29

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

AC301410

Connector: D-29

AI

1

2

Harness side
connector
(front view)

AC301408

Connector: D-31

AE

11

1

4

3

10
16

13

12

5 6

2

14

8

15

9

7

TROUBLESHOOTING

SUPPLEMENTAL RESTRAINT SYSTEM (SRS)

52B-50

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

).

Code No.27: Driver's seat belt pre-tensioner (squib) system (open-circuited in the squib circuit) <R.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 driver's seat belt
pre-tensioner squib wire(s) are open-circuited.

PROBABLE CAUSES

•

Improper connector contact

•

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

•

Malfunction of the SRS-ECU

CONNECTOR
LOCK
SWITCH

NOTE

CONNECTOR
COUPLED: ON
CONNECTOR
UNCOUPLED: OFF

CONNECTOR
LOCK
SWITCH

MICROCOMPUTER

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

SRS-ECU

SEAT BELT
PRE-TENSIONER
(RH)

AIR BAG
DRIVE CIRCUIT

Driver's Seat Belt Pre-Tensioner (Squib)