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Mitsubishi L200. Manual - part 617

TROUBLESHOOTING

SUPPLEMENTAL RESTRAINT SYSTEM (SRS)

52B-139

Code No.B1423: Side-airbag module (RH) (squib) system (short-circuited to the power supply)

AC805811

NOTE

: CONNECTOR LOCK SWITCH

CONNECTOR COUPLED: ON
CONNECTOR UNCOUPLED: OFF

Side-Airbag Module (RH) (Squib) Circuit

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

SRS-ECU

SIDE-AIRBAG
MODULE (SQUIB) (RH)

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 predeter-
mined level, the SRS-ECU sends an ignition sig-
nal. At this time, if the side air bag safing G-
sensor is on, the SRS side-airbag will inflate.

• The ignition signal is input to the side-airbag

module to inflate the side-airbag.

DIAGNOSIS CODE SET CONDITIONS
This diagnosis code is set if the side-airbag (RH)
squib wire(s) are short-circuited to the power supply.

PROBABLE CAUSES

• Damaged harness wires and connectors

• Short to the power supply in the side-airbag mod-

ule (RH) (squib) harness

• Malfunction of the SRS-ECU

TROUBLESHOOTING

SUPPLEMENTAL RESTRAINT SYSTEM (SRS)

52B-140

DIAGNOSIS PROCEDURE

STEP1. Check the diagnosis code by connecting
a dummy resistor. (M.U.T.-III diagnosis code)
(1) Disconnect the negative battery terminal.

AC903877AF

Connector: D-36 <LHD>

D-36 (Y)

Harness side
connector
(rear view)

<CLUB CAB>

AC903879AD

Connector: D-36 <RHD>

D-36 (Y)

Harness side
connector
(rear view)

<CLUB CAB>

AC903885AM

Connector: D-36 <LHD>

D-36 (Y)

Harness side
connector
(rear view)

<DOUBLE CAB>

AC903886 AH

Connector: D-36 <RHD>

D-36 (Y)

Harness side
connector
(rear view)

<DOUBLE CAB>

AC706606

Locking button

(2) Disconnect side-airbag module (RH) connector

TROUBLESHOOTING

SUPPLEMENTAL RESTRAINT SYSTEM (SRS)

52B-141

D-36. When disconnecting connector D-36,
unlock the connector by sliding the locking button
to the direction of the arrow as shown in the
figure, and then disconnect the connector.

AC507310 BG

D-36

Side-airbag

module (RH) connector

D-36
Harness side
connector

MB991865
(Dummy resistor: 3 )

MB991866

(Resistor harness)

(3) Connect special tool dummy resistor (MB991865)

to special tool resistor harness (MB991866).

CAUTION

Do not insert a test probe into the terminal from
its front side directly as the connector contact
pressure may be weakened.
(4) Insert special tool (MB991866) into the harness

side connector D-36 by backprobing.

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

diagnosis code.

Q: Is diagnosis code B1423 set?

YES :

Go to Step 2

NO :

Replace the front seatback assembly (RH)
(Refer to

P.52B-276

TROUBLESHOOTING

SUPPLEMENTAL RESTRAINT SYSTEM (SRS)

52B-142

STEP 2. Voltage measurement at the SRS-ECU
connector C-155.
(1) Disconnect the negative battery terminal.

AC801404

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 side-airbag mod-
ule (RH) connector D-36 to short the squib
circuit.

AC903877AF

Connector: D-36 <LHD>

D-36 (Y)

Harness side
connector
(rear view)

<CLUB CAB>

AC903879AD

Connector: D-36 <RHD>

D-36 (Y)

Harness side
connector
(rear view)

<CLUB CAB>

AC903885AM

Connector: D-36 <LHD>

D-36 (Y)

Harness side
connector
(rear view)

<DOUBLE CAB>

AC903886 AH

Connector: D-36 <RHD>

D-36 (Y)

Harness side
connector
(rear view)

<DOUBLE CAB>

AC706606

Locking button

(3) Disconnect side-airbag module (RH) connector

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