Mitsubishi L200. Manual - part 626

TROUBLESHOOTING

SUPPLEMENTAL RESTRAINT SYSTEM (SRS)

52B-175

STEP 2. Check the harness wires for open circuit 
and short circuit between SRS-ECU connector C-
153 (terminal No.15 and 16) and side impact 
sensor (LH) connector D-34 (terminal No.2 and 
1).

AC801404

AL

Connector: C-153

C-153 (Y)

Harness side 
connector 
(rear view)

AC903877

Connector: D-34 <LHD>

<CLUB CAB>

AI

D-34 (Y)

Harness side 
connector 
(rear view)

AC903879AG

Connector: D-34 <RHD>

<CLUB CAB>

D-34 (Y)

Harness side 
connector 
(rear view)

AC903885AP

Connector: D-34 <LHD>

<DOUBLE CAB>

D-34 (Y)

Harness side 
connector 
(rear view)

AC903886 AK

Connector: D-34 <RHD>

<DOUBLE CAB>

D-34 (Y)

Harness side 
connector 
(rear view)

TROUBLESHOOTING

SUPPLEMENTAL RESTRAINT SYSTEM (SRS)

52B-176

Q: Is the check result normal? 

YES : 

Go to Step 3.

NO : 

Repair the harness wires between SRS-
ECU connector C-153 (terminal No.15 and 
16) and side impact sensor (LH) connector 
D-34 (terminal No.2 and 1).

STEP 3. Check whether the diagnosis code is 
reset.

Q: Is diagnosis code B1438 or B1439 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.B1440: Curtain air bag module (RH) (squib) system (short-circuited between terminals of the 
squib circuit)

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 one curtain air bag (RH) 
squib wire shorted to the other.

TROUBLESHOOTING

SUPPLEMENTAL RESTRAINT SYSTEM (SRS)

52B-177

PROBABLE CAUSES

• Improper engaged connector or defective short 

spring*

• Short circuit between the curtain air bag 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, C-156, C-157 
or D-32 is damaged or improperly engaged, the short 
spring may not be released when the connector is 
connected.

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-155. (M.U.T.-III diagnosis code)
(1) Disconnect the negative battery terminal.

AC801404

AK

Connector: C-155

C-155 (Y)

Harness side 
connector 
(rear view)

(2) Disconnect the connectors C-155 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 B1440 set?

YES : 

Go to Step 3.

NO : 

The procedure is complete. It is assumed 
that diagnosis code B1440 set as connector 
C-155 was engaged improperly.

TROUBLESHOOTING

SUPPLEMENTAL RESTRAINT SYSTEM (SRS)

52B-178

STEP 3. Connector lock check: SRS-ECU 
connector C-155, intermediate connector C-156, 
C-157 and curtain air bag module (RH) connector 
D-32. (M.U.T.-III diagnosis code)
(1) Disconnect the negative battery terminal.