Mitsubishi L200. Manual — part 628

TROUBLESHOOTING

SUPPLEMENTAL RESTRAINT SYSTEM (SRS)

52B-183

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.

AC903885AQ

Connector: D-32 <LHD>

Harness side
connector
(rear view)

D-32 (B)

AC903886 AL

Connector: D-32 <RHD>

Harness side
connector
(rear view)

D-32 (B)

AC609928AL

Locking
button

Flat-tipped
screwdriver

Inflator

D-32 Harness side
connector (2-pin, black)

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

locking button of D-32 harness side connector to
the direction of the arrow. After releasing the lock,
disconnect the connector. Then, reconnect the
connector.

AC301553

D-32 Harness
side connector

CL

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-32

harness side connector.

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

diagnosis code.

Q: Is diagnosis code B1441 set?

YES :

Go to Step 2 .

NO :

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

P.52B-279

).

TROUBLESHOOTING

SUPPLEMENTAL RESTRAINT SYSTEM (SRS)

52B-184

STEP 2. Resistance measurement between SRS-
ECU connector C-155 (terminal No.55 and 56)
and the curtain air bag module (RH) connector D-
32 (terminal No.2 and 1).
(1) Disconnect the negative battery terminal.

AC801404

AK

Connector: C-155

C-155 (Y)

Harness side
connector
(rear view)

(2) Disconnect SRS-ECU connector C-155.

DANGER

To prevents the air bag from deploying unin-
tentionally, disconnect the curtain air bag
module (RH) connector D-32 to short the
squib circuit.

AC903885AQ

Connector: D-32 <LHD>

Harness side
connector
(rear view)

D-32 (B)

AC903886 AL

Connector: D-32 <RHD>

Harness side
connector
(rear view)

D-32 (B)

AC609928AL

Locking
button

Flat-tipped
screwdriver

Inflator

D-32 Harness side
connector (2-pin, black)

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

locking button of D-32 harness side connector to
the direction of the arrow. After releasing the lock,
disconnect the connector. Then, reconnect the
connector.

AC801564

Section
A - A

C-155 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 55, 56 and the short spring to

TROUBLESHOOTING

SUPPLEMENTAL RESTRAINT SYSTEM (SRS)

52B-185

release the short spring.

AC201287

AC201287FA

D-32
Harness side
connector

MB991884

(5) Connect D-32 harness side connector to special

tool resistor harness (MB991884).

AC800962 BS

Special tool
MB991884

C-155 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.
(6) Resistance measurement between the following

terminals.

• SRS-ECU connector C-155 terminal No.55

and special tool terminal No.1

• SRS-ECU connector C-155 terminal No.56

and special tool terminal No.2

OK: Continuity (Less than 2

Ω)

Q: Are the check results normal?

YES :

Go to Step 3 .

NO :

Repair the harness wires between SRS-
ECU connector C-155 (terminal No.55 and
56) and curtain air bag module (RH)
connector D-32 (terminal No.2 and1).

STEP 3. Check whether the diagnosis code is
reset.

Q: Is diagnosis code B1441 set?

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 ).

TROUBLESHOOTING

SUPPLEMENTAL RESTRAINT SYSTEM (SRS)

52B-186

Code No.B1442: Curtain air bag module (RH) (squib) system (short-circuited to the earth)

AC805929

SRS-ECU

CURTAIN AIR BAG MODULE
(SQUIB) (RH)

Curtain Air Bag Module (Squib) (RH) 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

AC

RH CURTAIN AIR BAG
DRIVE 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 (RH)
squib wire(s) are short-circuited to the earth.

PROBABLE CAUSES

• Damaged harness wires and connectors

• Short to the earth in the curtain air bag module

(RH) (squib) harness

• Malfunction of the SRS-ECU