Mitsubishi Outlander GS45X. Manual — part 1432

SRS AIR BAG DIAGNOSIS

TSB Revision

SUPPLEMENTAL RESTRAINT SYSTEM (SRS)

52B-223

STEP 2. 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 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 lap pre-tensioner. (Using scan tool
MB991958, read the diagnostic trouble code.)
(1) Disconnect the negative battery terminal.
(2) Disconnect lap pre-tensioner connector D-24. 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-24 harness side

connector.

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

diagnostic trouble code.

Q: Is DTC B1C33 set?

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

Refer to

P.52B-457

. Then go to Step 6.

ZC501967

AC404789

AC701411AB

MB991824

MB991827

MB991910

Data link
connector

AC701629 AB

Harness side
connector

Locking button

Flat-tipped
screwdriver

Lap pre-tensioner

AC301553 BE

Harness side
connector

MB991865

(Dummy resistor: 3 )

MB991884

(Resistor harness)

SRS AIR BAG DIAGNOSIS

TSB Revision

SUPPLEMENTAL RESTRAINT SYSTEM (SRS)

52B-224

STEP 4. Check the lap pre-tensioner 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 lap pre-tensioner from deploying unin-
tentionally, disconnect the lap pre-tensioner connec-
tor D-24 to short the squib circuit.

(3) Disconnect lap pre-tensioner connector D-24. 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 35, 36 and the short spring to
release the short spring.

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

terminals 35, 36 and body ground.
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 B1C33 sets,
replace the SRS-ECU (Refer to

P.52B-436

). Then go

to Step 6.

NO : Go to Step 5.

AC507645

A

AC

Lock lever

AC701629 AB

Harness side
connector

Locking button

Flat-tipped
screwdriver

Lap pre-tensioner

AC507303AM

A

A

C-27 Harness side
connector (front view)

Section
A - A

Cable tie

Short spring

4 mm or more

Terminal

AC608812 HJ

C-27 Harness side
connector (front view)

SRS AIR BAG DIAGNOSIS

TSB Revision

SUPPLEMENTAL RESTRAINT SYSTEM (SRS)

52B-225

STEP 5. Check harness wires for short circuit to ground
between SRS-ECU connector C-27 (terminal No.35 and 36)
and lap pre-tensioner connector D-24 (terminal No.2 and
1).
Q: Is the check result normal?

YES : Go to Step 6.
NO : Repair the harness wires between SRS-ECU

connector C-27 and lap pre-tensioner connector
D-24. Then go to Step 6.

STEP 6. 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 B1C33 set?

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

ZC501967

AC404789

AC701411AB

MB991824

MB991827

MB991910

Data link
connector

SRS AIR BAG DIAGNOSIS

TSB Revision

SUPPLEMENTAL RESTRAINT SYSTEM (SRS)

52B-226

DTC B1C34: Driver’s Lap Pre-tensioner (Squib) System (Shorted to Squib Circuit Power Supply)

CAUTION

If DTC B1C34 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 lap pre-tensioner will deploy.

.

DTC SET CONDITIONS

This DTC is set if there is abnormal resistance
between the input terminals of the lap pre-tensioner
(squib).

.

TROUBLESHOOTING HITS

• Damaged wiring harnesses or connectors

• Short to power supply in the lap pre-tensioner

(squib) harness

• Malfunction of the SRS-ECU

SRS-ECU

Driver's Lap pre-tensioner (Squib) Circuit

CONNECTOR
LOCK SWITCH

LAP
PRE-TENSIONER
(SQUIB)

CONNECTOR
LOCK SWITCH

: CONNECTOR CONNECTED: ON
CONNECTOR DISCONNECTED: OFF

NOTE

AC901076

C-27 (Y)

AC

Connector: C-27

AC901079

Connector: D-24

AG

D-24 (B)