Mitsubishi L200. Manual - part 609

TROUBLESHOOTING

SUPPLEMENTAL RESTRAINT SYSTEM (SRS)

52B-107

Code No.

Part/Circuit integral to SRS-
ECU

Trouble causes

B1404

Driver's air bag module (squib 
ignition drive circuit)

• Short circuit in the squib ignition drive circuit

B1405

• Open circuit in the squib ignition drive circuit

B1414

Passenger's (front) air bag 
module (squib ignition drive 
circuit)

• Short circuit in the squib ignition drive circuit

B1415

• Open circuit in the squib ignition drive circuit

B1424

Side-airbag module (RH) (squib 
ignition drive circuit)

• Short circuit in the squib ignition drive circuit

B1425

• Open circuit in the squib ignition drive circuit

B1434

Side-airbag module (LH) (squib 
ignition drive circuit)

• Short circuit in the squib ignition drive circuit

B1435

• Open circuit in the squib ignition drive circuit

B1444

Curtain air bag module (RH) 
(squib ignition drive circuit)

• Short circuit in the squib ignition drive circuit

B1445

• Open circuit in the squib ignition drive circuit

B1454

Curtain air bag module (LH) 
(squib ignition drive circuit)

• Short circuit in the squib ignition drive circuit

B1455

• Open circuit in the squib ignition drive circuit

B1466

Analogue G-sensor (front air bag)

• When the analogue G-sensor is not operating

• When the characteristics of the analogue G-sensor 

are abnormal

• When the output from the analogue G-sensor is 

abnormal

B1467

Safing G-sensor (front air bag)

• Open circuit in the safing G-sensor

B1468

• Short circuit in the safing G-sensor

B1469

Analogue G-sensor (side air bag)

• When the analogue G-sensor is not operating

• When the characteristics of the analogue G-sensor 

are abnormal

• When the output from the analogue G-sensor is 

abnormal

B1478

Capacitor

• Voltage at the capacitor terminal is higher than the 

specified value for five seconds or more

B1479

• Voltage at the capacitor terminal is lower than the 

specified value for five seconds or more (This is not 
detected if diagnosis code B1476 or B1477 indicating 
battery positive voltage drop has been set).

B1496

Non-volatile memory (EEPROM)

• When the non-volatile memory (EEPROM) is 

abnormal

B1497

Application specific integrated 
circuit (for frontal activation)

• When the application specific integrated circuit (frontal 

activation) is abnormal

B1498

ROM or RAM

• When the ROM or RAM is abnormal

B1499

Collision decision

• If this code is set before the air bags have deployed, 

an internal failure may have occurred in the SRS-
ECU.

B1550

SRS warning lamp drive circuit

• Failure in SRS warning lamp drive circuit

B1557

Application specific integrated 
circuit

• When the application specific integrated circuit is 

abnormal

TROUBLESHOOTING

SUPPLEMENTAL RESTRAINT SYSTEM (SRS)

52B-108

PROBABLE CAUSE
Malfunction of the SRS-ECU

DIAGNOSIS PROCEDURE

Replace the SRS-ECU (Refer to 

P.52B-266

).

B1607

Seat belt pre-tensioner (driver's 
side) (squib ignition drive circuit)

• Short circuit in the squib ignition drive circuit

B1608

• Open circuit in the squib ignition drive circuit

B1613

Seat belt pre-tensioner 
(passenger’s side) (squib ignition 
drive circuit)

• Short circuit in the squib ignition drive circuit

B1614

• Open circuit in the squib ignition drive circuit

Code No.

Part/Circuit integral to SRS-
ECU

Trouble causes

TROUBLESHOOTING

SUPPLEMENTAL RESTRAINT SYSTEM (SRS)

52B-109

Code No.B1410: Passenger's (front) air bag module (squib) system (short-circuited between 
terminals of the squib circuit)

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.

DIAGNOSIS CODE SET CONDITIONS
This diagnosis code is set if one passenger’s (front) 
air bag squib wire shorted to the other.

TROUBLESHOOTING

SUPPLEMENTAL RESTRAINT SYSTEM (SRS)

52B-110

PROBABLE CAUSES

• Improper engaged connector or defective short 

spring*

• Short circuit between the passenger's (front) air 

bag module (squib) circuit terminals

• Damaged connector(s)

• Malfunction of the passenger’s air bag cut off 

switch

• 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-02 or C-154 is 
damaged or improperly engaged, the short spring 
may not be released when the connector is con-
nected.

DIAGNOSIS PROCEDURE

STEP 1. M.U.T.-III diagnosis code.

Q: Is diagnosis code B1519 set?

YES : 

Go to Step 2.

NO : 

Go to Step 3.

STEP 2. Connector lock check: SRS-ECU 
connector C-154. (M.U.T.-III diagnosis code)
(1) Disconnect the negative battery terminal.

AC801404

AJ

Connector: C-154

C-154 (Y)

Harness side 
connector 
(rear view)

(2) Disconnect the connectors C-154 and then 

reconnect them.

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

diagnosis code.

Q: Is diagnosis code B1410 set?

YES : 

Go to Step 3.

NO : 

The procedure is complete. It is assumed 
that diagnosis code B1410 set as connector 
C-154 was engaged improperly.

STEP 3. Connector lock check: SRS-ECU 
connector C-154 and passenger’s (front) air bag 
module connector C-02. (M.U.T.-III diagnosis 
code)
(1) Disconnect the negative battery terminal.

AC801404

AJ

Connector: C-154

C-154 (Y)

Harness side 
connector 
(rear view)

AC509788

C-02 (R)

AC

Glove box striker

2 1

Harness side 
connector 
(front view)

Lock 
lever

Connector: C-02

(2) Disconnect connectors C-02 and C-154, and then 

reconnect them. For connector C-02, pull up the 
harness side lock lever with a nail and disconnect 
the connector lock.

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

diagnosis code.

Q: Is diagnosis code B1410 set?

YES : 

Go to Step 4.

NO : 

The procedure is complete. It is assumed 
that diagnosis code B1410 set as connector 
C-02 or C-154 was engaged improperly.

STEP 4. 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 5.

NO : 

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

P.52B-287

).