Mitsubishi L200. Manual — part 631

AC801404

AL

Connector: C-153

C-153 (Y)

Harness side
connector
(rear view)

AC903856BN

Connector: C-157 <LHD>

C-157 (Y)

AC903868

CE

Connector: C-157 <RHD>

C-157 (Y)

AC806050

Connector: C-156 <LHD>

C-156 (Y)

AB

Floor wiringharness

Instrument panel
wiring harness

AC806051

Connector: C-156 <RHD>

C-156 (Y)

AB

Floor wiringharness

Instrument panel
wiring harness

AC600868

Outer housing of the intermediate connector
(Instrument panel wiring harness side)

AH

TROUBLESHOOTING

SUPPLEMENTAL RESTRAINT SYSTEM (SRS)

52B-195

(2) Disconnect connectors C-153, C-156 and C-157

and then reconnect them. Slide the outer hosing
of intermediate connector C-156 and C-157 in the
arrow direction shown.

AC903885AR

Connector: D-33 <LHD>

Harness side
connector
(rear view)

D-33 (B)

AC903886 AM

Connector: D-33 <RHD>

Harness side
connector
(rear view)

D-33 (B)

AC609928AM

Locking
button

Flat-tipped
screwdriver

Inflator

D-33 Harness side
connector (2-pin, black)

(3) Use the flat-tipped screwdriver to pull out the

locking button of D-33 harness side connector to
the direction of the arrow. After releasing the lock,
disconnect the connector. Then, reconnect the
connector.

(4) Connect the negative battery terminal.
(5) Erase the diagnosis code memory, and check the

TROUBLESHOOTING

SUPPLEMENTAL RESTRAINT SYSTEM (SRS)

52B-196

diagnosis code.

Q: Is diagnosis code B1450 set?

YES :

Go to Step 4.

NO :

The procedure is complete. It is assumed
that diagnosis code B1450 set as connector
C-153, C-156, C-157 or D-33 was engaged
improperly.

STEP 4. Check the diagnosis code by connecting
a dummy resistor. (M.U.T.-III diagnosis code)
(1) Disconnect the negative battery terminal.

AC903885AR

Connector: D-33 <LHD>

Harness side
connector
(rear view)

D-33 (B)

AC903886 AM

Connector: D-33 <RHD>

Harness side
connector
(rear view)

D-33 (B)

AC609928AM

Locking
button

Flat-tipped
screwdriver

Inflator

D-33 Harness side
connector (2-pin, black)

(2) Use the flat-tipped screwdriver to pull out the

locking button of D-33 harness side connector to
the direction of the arrow. After releasing the lock,
disconnect the connector.

AC301553

D-33 Harness
side connector

CM

MB991865

(Dummy resistor: 3 )

MB991884

(Resistor harness)

(3) Connect the dummy resistor (Special tool:

MB991865) to the resistor harness (Special tool:
MB991884).

(4) Connect special tool (MB991884) to the D-33

harness side connector.

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

diagnosis code.

Q: Is diagnosis code B1450 set?

YES :

Go to Step 5.

NO :

Replace the curtain air bag module (LH)
(Refer to

P.52B-279

).

TROUBLESHOOTING

SUPPLEMENTAL RESTRAINT SYSTEM (SRS)

52B-197

STEP 5. Resistance measurement at SRS-ECU
connector C-153.
(1) Disconnect the negative battery terminal.

AC801404

AL

Connector: C-153

C-153 (Y)

Harness side
connector
(rear view)

(2) Disconnect SRS-ECU connector C-153.

DANGER

To prevents the air bag from deploying unin-
tentionally, disconnect the curtain air bag
module (LH) connector D-33 to short the
squib circuit.

AC903885AR

Connector: D-33 <LHD>

Harness side
connector
(rear view)

D-33 (B)

AC903886 AM

Connector: D-33 <RHD>

Harness side
connector
(rear view)

D-33 (B)

AC609928AM

Locking
button

Flat-tipped
screwdriver

Inflator

D-33 Harness side
connector (2-pin, black)

(3) Use the flat-tipped screwdriver to pull out the

locking button of D-33 harness side connector to
the direction of the arrow. After releasing the lock,
disconnect the connector.

AC801566

Section
A - A

C-153 Harness side connectors
(front view)

Cable tie

Terminal

7 mm or more

AF

Short spring

A

A

CAUTION

Insert an insulator such as a cable tie to a depth
of 7 mm or more, otherwise the short spring will
not be released.
(4) Insert a cable tie [3 mm wide, 0.5 mm thick]

between terminals 1, 2 and the short spring to
release the short spring.

AC800962 BU

C-153 Harness side
connector (rear view)

CAUTION

Do not insert a test probe into the terminal from
its front side directly as the connector contact
pressure may be weakened.
(5) Resistance measurement between C-153

harness side connector terminals 1 and 2.

OK: Open circuit

Q: Is the check result normal?

YES :

Go to Step 6.

NO :

Repair the harness wires between SRS-
ECU connector C-153 (terminal No.1 and 2)
and curtain air bag module (LH) connector
D-33 (terminal No.1 and 2).

STEP 6. Check whether the diagnosis code is
reset.

Q: Is diagnosis code B1450 set?

TROUBLESHOOTING

SUPPLEMENTAL RESTRAINT SYSTEM (SRS)

52B-198

YES :

Replace the SRS-ECU (Refer to

P.52B-

266

).

NO :

An intermittent malfunction is suspected
(Refer to GROUP 00, How to Cope with
Intermittent Malfunction ).

Code No.B1451: Curtain air bag module (LH) (squib) system (open-circuited in the squib circuit)

AC805930

LH CURTAIN AIR BAG
DRIVE CIRCUIT

NOTE

: CONNECTOR LOCK SWITCH

CONNECTOR COUPLED: ON
CONNECTOR UNCOUPLED: OFF

Wire colour code
B : Black LG : Light green G : Green L : Blue W : White Y : Yellow SB : Sky blue
BR : Brown O : Orange GR : Grey R : Red P : Pink V : Violet PU : Purple SI : Silver

CURTAIN AIR BAG MODULE
(SQUIB) (LH)

AD

SRS-ECU

Curtain Air Bag Module (Squib) (LH) Circuit

OPERATION
The SRS-ECU judges how severe a collision is by
detecting signals from the left and right side impact
sensors. If the impact is over a predetermined level,
the SRS-ECU sends an ignition signal. At this time, if
the side-airbag safing G-sensor is on, the curtain air
bag module will deploy.

DIAGNOSIS CODE SET CONDITIONS
This diagnosis code is set if curtain air bag (LH)
squib wire(s) are open-circuited.

PROBABLE CAUSES

• Open circuit in the curtain air bag module (LH)

(squib) circuit

• Improper connector contact

• Malfunction of the SRS-ECU