Mitsubishi L200. Manual - part 633

TROUBLESHOOTING

SUPPLEMENTAL RESTRAINT SYSTEM (SRS)

52B-203

DIAGNOSIS PROCEDURE

STEP 1. 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

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 B1452 set?

YES :

Go to Step 2.

NO :

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

P.52B-279

TROUBLESHOOTING

SUPPLEMENTAL RESTRAINT SYSTEM (SRS)

52B-204

STEP 2. Resistance measurement at the SRS-
ECU connector C-153.
(1) Disconnect the negative battery terminal.

AC801404

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

Short spring

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.

AC800962BW

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, 2 and body
earth.

OK: Open circuit

Q: Is the check result normal?

YES :

Go to Step 3.

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 3. Check whether the diagnosis code is
reset.

Q: Is diagnosis code B1452 set?

TROUBLESHOOTING

SUPPLEMENTAL RESTRAINT SYSTEM (SRS)

52B-205

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.B1453: Curtain air bag module (LH) (squib) system (short-circuited to the power supply)

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)

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 the curtain air bag (LH)
squib wire(s) are short-circuited to the power supply.

PROBABLE CAUSES

• Damaged harness wires and connectors

• Short to the power supply in the curtain air bag

module (LH) (squib) harness

• Malfunction of the SRS-ECU

TROUBLESHOOTING

SUPPLEMENTAL RESTRAINT SYSTEM (SRS)

52B-206

DIAGNOSIS PROCEDURE

STEP1. 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

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 B1453 set?

YES :

Go to Step 2.

NO :

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

P.52B-279

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