Mitsubishi Outlander GS45X. Manual — part 1445

SRS AIR BAG DIAGNOSIS

TSB Revision

SUPPLEMENTAL RESTRAINT SYSTEM (SRS)

52B-275

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 passenger's seat belt pre-tensioner.
(Using scan tool MB991958, read the diagnostic trouble
code.)
(1) Disconnect the negative battery terminal.
(2) Disconnect passenger's seat belt pre-tensioner connector

D-130. Use a flat-tipped screwdriver to unlock the locking
button at the harness side connector by withdrawing it
toward you in two stages, and then disconnect the
connector.

(3) Connect special tool MB991865 to special tool MB991884.
(4) Connect special tool MB991884 to the D-130 harness side

connector.

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

diagnostic trouble code.

Q: Is DTC B1C49 set?

YES : Go to Step 4.
NO : Replace the passenger's seat belt with pre-tensioner

(Refer to

P.52B-457

). Then go to Step 5.

ZC501967

AC404789

AC701411AB

MB991824

MB991827

MB991910

Data link
connector

AC506363AB

Seat belt
pre-tensioner

Floor wiring harness side
connector (2-pin, black)

Locking
button

Flat-tipped
screwdriver

AC301553 BE

Harness side
connector

MB991865

(Dummy resistor: 3 )

MB991884

(Resistor harness)

SRS AIR BAG DIAGNOSIS

TSB Revision

SUPPLEMENTAL RESTRAINT SYSTEM (SRS)

52B-276

STEP 4. Check the harness for open circuit between
SRS-ECU connector C-27 (terminal No.43 and 44) and the
passenger's seat belt pre-tensioner connector D-130
(terminal No.2 and 1).
(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 seat belt pre-tensioner from deploying
unintentionally, disconnect the passenger’s seat belt
pre-tensioner connector D-130 to short the squib cir-
cuit.

(3) Disconnect SRS-ECU connector C-27 and passenger's

seat belt pre-tensioner connector D-130. For connector
D-130, use a flat-tipped screwdriver to unlock the locking
button at the harness side connector by withdrawing it
toward you in two stages, 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 43, 44 and the short spring to
release the short spring.

AC507645

A

AC

Lock lever

AC506363AB

Seat belt
pre-tensioner

Floor wiring harness side
connector (2-pin, black)

Locking
button

Flat-tipped
screwdriver

AC507303AL

A

A

C-27 Harness side
connector (front view)

Section
A - A

Cable tie

Short spring

4 mm or more

Terminal

SRS AIR BAG DIAGNOSIS

TSB Revision

SUPPLEMENTAL RESTRAINT SYSTEM (SRS)

52B-277

(5) Connect D-130 harness side connector to special tool

MB991884.

(6) Check for continuity between the following terminals. It

should be less than 2 ohms.

• SRS-ECU connector C-27 (terminal No.43) and the spe-

cial tool (terminal No.1)

• SRS-ECU connector C-27 (terminal No.44) and the spe-

cial tool (terminal No.2)

Q: Does continuity exist?

YES : Erase the diagnostic trouble code memory, and check

the diagnostic trouble code. If DTC B1C49 sets,
replace the SRS-ECU (Refer to

P.52B-436

). Then go

to Step 5.

NO : Repair the harness wires between SRS-ECU

connector C-27 passenger’s seat belt pre-tensioner
connector D-130. Then go to Step 5.

STEP 5. 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 B1C49 set?

YES : Return to Step 1.
NO : The procedure is complete.

AC201287 DG

MB991884

(Resistor harness)

D-130
Harness side
connector

AC608812DJ

2

1

C-27 Harness side
connector (front view)

Resistor harness
side connector

ZC501967

AC404789

AC701411AB

MB991824

MB991827

MB991910

Data link
connector

SRS AIR BAG DIAGNOSIS

TSB Revision

SUPPLEMENTAL RESTRAINT SYSTEM (SRS)

52B-278

DTC B1C4A: Front Passenger's Seat Belt Pre-tensioner (Squib) System (Short Circuit Between Squib
Circuit Terminals)

CAUTION

If DTC B1C4A is set in the SRS-ECU, always diag-
nose the CAN main bus line.

.

CIRCUIT 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 sends an
ignition signal. At this time, if the front air bag safing
G-sensor is on, the pre-tensioner will deploy.

.

DTC SET CONDITIONS

This DTC is set if there is abnormal resistance
between the input terminals of the passenger’s seat
belt pre-tensioner (squib).

.

TROUBLESHOOTING HITS

• 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

: CONNECTOR
CONNECTED: ON
CONNECTOR
DISCONNECTED: OFF

NOTE

Seat Belt Pre-Tensioner (passenger's side) (Squib) Circuit

SRS-ECU

SEAT BELT
PRE-TENSIONER
(RH)

CONNECTOR
LOCK
SWITCH

CONNECTOR
LOCK SWITCH

AC901076

C-27 (Y)

AC

Connector: C-27

AC901079

D-130 (B)

Connector: D-130

AI