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Mitsubishi Outlander XL. Manual - part 916

DTC B1C33: Driver’s Lap Pre-tensioner (Squib) System (Shorted to Squib Circuit
Ground)

M15204000946USA0000010000

CONNECTOR
LOCK SWITCH

LAP
PRE-TENSIONER
(SQUIB)

Lap Pre-Tensioner (LH) (Squib) Circuit

SRS-ECU

: CONNECTOR COUPLED : ON
CONNECTOR UNCOUPLED : OFF

NOTE

ZC600876

Connector: C-27

C-27 (Y)

0025

ZC600879

Connector: D-24

D-24 (B)

0014

If DTC B1C33 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 lap pre-tensioner will deploy.

SUPPLEMENTAL RESTRAINT SYSTEM (SRS)

52B-195

SRS AIR BAG DIAGNOSIS

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 the ground in the lap pre-tensioner (squib)
harness

｠

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-196

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 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.

ZC6018320001

Harness side
connector

Locking button

Flat-tipped
screwdriver

Lap pre-tensioner

(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.

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-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 pre-tensioner. Refer

to P.52B-345. Then go to Step 6.

STEP 4. Check the lap pre-tensioner circuit. Measure the
resistance at the SRS-ECU connector C-27.

(1)

Disconnect SRS-ECU connector C-27.

SUPPLEMENTAL RESTRAINT SYSTEM (SRS)

52B-197

SRS AIR BAG DIAGNOSIS

ZC6018320001

Harness side
connector

Locking button

Flat-tipped
screwdriver

Lap pre-tensioner

(2)

ZC5007880042

C-27 Harness side
connector (front view)

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 C-27 harness side connector
terminals 35, 36 and body ground.
It should be an open circuit.

Q:Does continuity exist?

YES:

Go to Step 5.

NO:

Erase the diagnostic trouble code memory, and check

the diagnostic trouble code. If DTC B1C33 sets, replace
the SRS-ECU (Refer to P.52B-326). Then go to Step 6.

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:Are the harness wires between SRS-ECU connector C-27

(terminal No.35 and 36) and lap pre-tensioner connector

D-24 (terminal No.2 and 1) in good condition?

YES:

Go to Step 6.

NO:

Replace the harness wires between SRS-ECU connector

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

52B-198

SUPPLEMENTAL RESTRAINT SYSTEM (SRS)

SRS AIR BAG DIAGNOSIS

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