Mitsubishi L200. Manual - part 619

TROUBLESHOOTING

SUPPLEMENTAL RESTRAINT SYSTEM (SRS)

52B-147

• Malfunction of the SRS-ECU

DIAGNOSIS PROCEDURE

STEP 1.Check the side impact sensor (RH).
(1) Disconnect the negative battery terminal.
(2) Alternate the side impact sensor (RH) and the 

side impact sensor (LH), and then install the 
alternated sensor.

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

diagnosis code.

Q: Is diagnosis code B1438 or B1439 set?

YES : 

Replace the side impact sensor (RH) with a 

new one (Refer to 

P.52B-282

). Then go to 

Step 3.

NO : 

Go to Step 2.

TROUBLESHOOTING

SUPPLEMENTAL RESTRAINT SYSTEM (SRS)

52B-148

STEP 2. Check the harness wires for open circuit 
and short circuit between SRS-ECU connector C-
155 (terminal No.61 and 62) and side impact 
sensor (RH) connector D-37 (terminal No.1 and 
2).

AC801404

AK

Connector: C-155

C-155 (Y)

Harness side 
connector 
(rear view)

AC903877AG

Connector: D-37 <LHD>

<CLUB CAB>

D-37 (Y)

Harness side 
connector 
(rear view)

AC903879AE

Connector: D-37 <RHD>

<CLUB CAB>

D-37 (Y)

Harness side 
connector 
(rear view)

AC903885AN

Connector: D-37 <LHD>

<DOUBLE CAB>

D-37 (Y)

Harness side 
connector 
(rear view)

AC903886 AI

Connector: D-37 <RHD>

<DOUBLE CAB>

D-37 (Y)

Harness side 
connector 
(rear view)

TROUBLESHOOTING

SUPPLEMENTAL RESTRAINT SYSTEM (SRS)

52B-149

Q: Is the check result normal? 

YES : 

Go to Step 3.

NO : 

Repair the harness wires between SRS-
ECU connector C-155 (terminal No.61 and 
62) and side impact sensor (RH) connector 
D-37 (terminal No.1 and 2).

STEP 3. Check whether the diagnosis code is 
reset.

Q: Is diagnosis code B1428 or B1429 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 ).

Code No.B1430: Side-airbag module (LH) (squib) system (short-circuited between terminals of the 
squib circuit)

AC801027

NOTE

: CONNECTOR LOCK SWITCH

CONNECTOR COUPLED: ON
CONNECTOR UNCOUPLED: OFF

Side-Airbag Module (LH) (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

AC

SRS-ECU

SIDE-AIRBAG  
MODULE (SQUIB) (LH)

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 (LH) 
squib wire shorted to the other.

TROUBLESHOOTING

SUPPLEMENTAL RESTRAINT SYSTEM (SRS)

52B-150

PROBABLE CAUSES

• Improper engaged connector or defective short 

spring*

• Short circuit between the side-airbag module 

(LH) (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-153 or D-35 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-153. (M.U.T.-III diagnosis code)
(1) Disconnect the negative battery terminal.

AC801404

AL

Connector: C-153

C-153 (Y)

Harness side 
connector 
(rear view)

(2) Disconnect the connectors C-153 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 B1430 set?

YES : 

Go to Step 3

NO : 

The procedure is complete. It is assumed 
that diagnosis code B1430 set as connector 
C-153 was engaged improperly.