Mitsubishi L200. Manual — part 612

TROUBLESHOOTING

SUPPLEMENTAL RESTRAINT SYSTEM (SRS)

52B-119

Code No.B1413: Passenger's (front) air bag module (squib) system (short-circuited to the power
supply)

IND

AC805798

PASSENGER'S (FRONT)
AIR BAG MODULE
(SQUIB)

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

J/B
(FUSE )

PASSENGER'S
AIR BAG
CUT OFF
INDICATOR

CONNECTOR LOCK SWITCH

CONNECTOR COUPLED: ON

CONNECTOR UNCOUPLED: OFF

NOTE

:

Passenger's (Front) Air Bag Module (Squib) Circuit

PASSENGER'S AIR BAG
CUT OFF SWITCH

AC

SRS-ECU

OPERATION

• The SRS-ECU judges how severe a collision is

by detecting signals from the front impact sensors
and the front air bag analogue 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 SRS air

bag will inflate.

• The ignition signal is input to the air bag module

to inflate the air bag.

TROUBLESHOOTING

SUPPLEMENTAL RESTRAINT SYSTEM (SRS)

52B-120

DIAGNOSIS CODE SET CONDITIONS
This diagnosis code is set if the passenger's (front)
air bag squib wire(s) are short-circuited to the power
supply.

PROBABLE CAUSES

• Damaged harness wires and connectors

• Short to the power supply in the passenger's

(front) air bag module (squib) harness

• Malfunction of the passenger’s air bag cut off

switch

• Malfunction of the SRS-ECU

DIAGNOSIS PROCEDURE

STEP 1. Check the passenger’s air bag cut off
switch.
Check the passenger's air bag cut off switch (Refer
to

P.52B-288

).

Q: Is the check result normal?

YES :

Go to Step 2.

NO :

Replace passenger’s air bag cut off switch
(Refer to

P.52B-287

).

STEP2. Check the diagnosis code by connecting
a dummy resistor. (M.U.T.-III diagnosis code)
(1) Disconnect the negative battery terminal.

AC509788

C-02 (R)

AC

Glove box striker

2 1

Harness side
connector
(front view)

Lock
lever

Connector: C-02

(2) Disconnect passenger’s (front) air bag module

connector C-02. Pull up the harness side lock
lever with a nail and disconnect the connector
lock.

AC300956 AP

MB991865
(Dummy resistor: 3 )

MB991866

(Resistor harness)

C-02 Passenger's

(front) air bag

module connector

C-02 Harness side

connector

(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 C-02 by backprobing.

(5) Check that the passenger's air bag cut off switch

is "ON" position.

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

diagnosis code.

Q: Is diagnosis code B1413 set?

YES :

Go to Step 3.

NO :

Replace the passenger's (front) air bag
module (Refer to

P.52B-268

).

STEP 3. Voltage measurement at the SRS-ECU
connector C-154.
(1) Disconnect the negative battery terminal.

AC801404

AJ

Connector: C-154

C-154 (Y)

Harness side
connector
(rear view)

(2) Disconnect SRS-ECU connector C-154.

AC509788

C-02 (R)

AC

Glove box striker

2 1

Harness side
connector
(front view)

Lock
lever

Connector: C-02

DANGER

To prevents the air bag from deploying unin-
tentionally, disconnect the passenger’s
(front) air bag module connector C-02 to
short the squib circuit.

(3) Disconnect passenger’s (front) air bag module

connector C-02. Pull up the harness side lock
lever with a nail and disconnect the connector

TROUBLESHOOTING

SUPPLEMENTAL RESTRAINT SYSTEM (SRS)

52B-121

lock.

AC801565

Section
A - A

C-154 Harness side connectors
(front view)

Cable tie

Terminal

7 mm or more

AE

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 21, 22 and the short spring to
release the short spring.

(5) Connect the negative battery terminal.
(6) Turn the ignition switch to the "ON" position.
(7) Check that the passenger's air bag cut off switch

is "ON" position.

AC800963AO

C-154 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.
(8) Voltage measurement between C-154 harness

side connector terminals 21, 22 and body earth.

OK: 1 V or less

Q: Is the check result normal?

YES :

Go to Step 4.

NO :

Repair the harness wires between SRS-
ECU connector C-154 (terminal No.21 and
22) and passenger's (front) air bag module
connector C-02 (terminal No.1 and 2).

STEP 4. Check whether the diagnosis code is
reset.

Q: Is diagnosis code B1413 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-122

Code No.B1420: Side-airbag module (RH) (squib) system (short-circuited between terminals of the
squib circuit)

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

AB

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 one side-airbag (RH)
squib wire shorted to the other.

PROBABLE CAUSES

• Improper engaged connector or defective short

spring*

• Short circuit between the side-airbag module

(RH) (squib) circuit terminals

• Damaged connector(s)

• Malfunction of the SRS-ECU

NOTE: *: The squib circuit connectors integrate a
"short" spring (which prevents the air bag from
deploying unintentionally due to static electricity by
shorting the positive wire to the earth wire in the
squib circuit when the connectors are discon-
nected).Therefore, if connector C-155 or D-36 is
damaged or improperly engaged, the short spring
may not be released when the connector is con-
nected.