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Mitsubishi Outlander XL. Manual - part 928

DTC B1C49: Front Passenger's Pre-tensioner (Squib) System (Squib Circuit Open)

M15204000941USA0000010000

SEAT BELT
PRE-TENSIONER
(RH)

CONNECTOR
LOCK SWITCH

Seat Belt Pre-Tensioner (RH) (Squib) Circuit

SRS-ECU

: CONNECTOR COUPLED : ON
CONNECTOR UNCOUPLED : OFF

NOTE

ZC600876

Connector: C-27

C-27 (Y)

0025

ZC600879

Connector: D-130

D-130 (B)

0013

If DTC B1C49 is set in the SRS-ECU, always
diagnose 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.

SUPPLEMENTAL RESTRAINT SYSTEM (SRS)

52B-243

SRS AIR BAG DIAGNOSIS

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

｠

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

｠

Improper connector contact

｠

Malfunction of the SRS-ECU

DIAGNOSIS

Required Special Tools:

｠

MB991958: Scan Tool (M.U.T.-III Sub Assembly)

｠

MB991824: Vehicle Communication Interface (V.C.I.)

｠

MB991827: M.U.T.-III USB Cable

｠

MB991910: M.U.T.-III Main Harness A (Vehicles with
CAN Communication System)

｠

MB991865: Dummy resistor

｠

MB991884: Resister harness

STEP 1. Using scan tool MB991958, diagnose the CAN bus
line.

ZC501967

AC404789

ZC5019680000

MB991824

MB991827

MB991910

Data link

connector

To prevent damage to scan tool MB991958, always turn the
ignition switch to the "LOCK" (OFF) position before
connecting or disconnecting scan tool MB991958.

(1)

Connect scan tool MB991958. Refer to "How to connect the
scan tool P.52B-31."

(2)

Turn the ignition switch to the "ON" position.

(3)

Diagnose the CAN bus line.

(4)

Turn the ignition switch to the "LOCK" (OFF) position.

Q:Is the CAN bus line found to be normal?

YES:

Go to Step 2.

NO:

Repair the CAN bus line (Refer to GROUP 54D,

Diagnosis P.54D-17).

52B-244

SUPPLEMENTAL RESTRAINT SYSTEM (SRS)

SRS AIR BAG DIAGNOSIS

STEP 2. Recheck for diagnostic trouble code.

ZC501967

AC404789

ZC5019680000

MB991824

MB991827

MB991910

Data link

connector

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.

ZC6018230000

Seat belt
pre-tensioner

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

Locking
button

Flat-tipped
screwdriver

(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.

ZC600214

Harness side
connector

MB991865
(Dummy resistor: 3

)

MB991884
(Resistor harness)

0000

(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-345). Then go to Step 5.

STEP 4. Check the harness for open circuit between SRS-
ECU connector C-27 (terminal No.43 and 44) and the

SUPPLEMENTAL RESTRAINT SYSTEM (SRS)

52B-245

SRS AIR BAG DIAGNOSIS

passenger's seat belt pre-tensioner connector D-130
(terminal No.2 and 1).

ZC6018230000

Seat belt
pre-tensioner

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

Locking
button

Flat-tipped
screwdriver

(1)

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.

ZC603339

MB991884

D-130
Harness side
connector

0002

(2)

Connect D-130 harness side connector to special tool
MB991884.

ZC5007880046

C-27 Harness side
connector (front view)

Resistor harness
side connector

Do not insert a test probe into the terminal from its front side
directly as the connector contact pressure may be
weakened.

(3)

Check for continuity between the following terminals. It
should be less than 2 ohms.

｠

SRS-ECU connector C-27 (terminal No.43) and the special
tool (terminal No.1)

｠

SRS-ECU connector C-27 (terminal No.44) and the special
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-326). Then go to Step 5.

NO:

Replace the harness wires between SRS-ECU connector

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

52B-246

SUPPLEMENTAL RESTRAINT SYSTEM (SRS)

SRS AIR BAG DIAGNOSIS

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