Mitsubishi L200. Manual - part 630

TROUBLESHOOTING

SUPPLEMENTAL RESTRAINT SYSTEM (SRS)

52B-191

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

AC801404

AK

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 curtain air bag 
module (RH) connector D-32 to short the 
squib circuit.

AC903885AQ

Connector: D-32 <LHD>

Harness side 
connector 
(rear view)

D-32 (B)

AC903886 AL

Connector: D-32 <RHD>

Harness side 
connector 
(rear view)

D-32 (B)

AC609928AL

Locking 
button

Flat-tipped 
screwdriver

Inflator

D-32 Harness side 
connector (2-pin, black)

(3) Use the flat-tipped screwdriver to pull out the 

locking button of D-32 harness side connector to 
the direction of the arrow. After releasing the lock, 
disconnect the connector. 

AC801564

Section
A - A

C-155 Harness side connectors
(front view)

Cable tie

Terminal

 7 mm or more

AF

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 55, 56 and the short spring to 
release the short spring.

(5) Connect the negative battery terminal.
(6) Turn the ignition switch to the "ON" position.

AC800963AR

C-155 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.
(7) Voltage measurement between C-155 harness 

side connector terminals 55, 56 and body earth.

OK: 1 V or less

Q: Is the check result normal? 

YES : 

Go to Step 3.

NO : 

Repair the harness wires between SRS-
ECU connector C-155 (terminal No.55 and 
56) and side-airbag (RH) air bag module 
connector D-32 (terminal No.2 and 1).

STEP 3. Check whether the diagnosis code is 
reset.

Q: Is diagnosis code B1443 set?

TROUBLESHOOTING

SUPPLEMENTAL RESTRAINT SYSTEM (SRS)

52B-192

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.B1450: Curtain air bag module (LH) (squib) system (short-circuited between terminals of the 
squib circuit)

AC805930

LH CURTAIN AIR BAG
DRIVE 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

CURTAIN AIR BAG MODULE
(SQUIB) (LH)

AD

SRS-ECU

Curtain Air Bag Module (Squib) (LH) 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 (LH) 
squib wire shorted to the other.

PROBABLE CAUSES

• Improper engaged connector or defective short 

spring*

• Short circuit between the curtain air bag module 

(LH) (squib) circuit terminals

• Damaged connector(s)

TROUBLESHOOTING

SUPPLEMENTAL RESTRAINT SYSTEM (SRS)

52B-193

• 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, C-156 C-157 
or D-33 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-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 B1450 set?

YES : 

Go to Step 3.

NO : 

The procedure is complete. It is assumed 
that diagnosis code B1450 set as connector 
C-153 was engaged improperly.

TROUBLESHOOTING

SUPPLEMENTAL RESTRAINT SYSTEM (SRS)

52B-194

STEP 3. Connector lock check: SRS-ECU 
connector C-153, intermediate connector C-156, 
C-157 and curtain air bag module (LH) connector 
D-33. (M.U.T.-III diagnosis code)
(1) Disconnect the negative battery terminal.