Mitsubishi L200. Manual - part 614

TROUBLESHOOTING

SUPPLEMENTAL RESTRAINT SYSTEM (SRS)

52B-127

D-36. When disconnecting connector D-36, 
unlock the connector by sliding the locking button 
to the direction of the arrow as shown in the 
figure, and then disconnect the connector.

AC507310 BG

D-36 

Side-airbag 

module (RH) connector

D-36 
Harness side 
connector

MB991865
(Dummy resistor: 3    )

MB991866 

(Resistor harness)

(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 D-36 by backprobing.

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

diagnosis code.

Q:  Is diagnosis code B1420 set?

YES : 

Go to Step 5

NO : 

Replace the front seatback assembly (RH) 
(Refer to 

P.52B-276

).

TROUBLESHOOTING

SUPPLEMENTAL RESTRAINT SYSTEM (SRS)

52B-128

STEP 5. Resistance measurement at 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 side-airbag mod-
ule (RH) connector D-36 to short the squib 
circuit.

AC903877AF

Connector: D-36 <LHD>

D-36 (Y)

Harness side 
connector 
(rear view)

<CLUB CAB>

AC903879AD

Connector: D-36 <RHD>

D-36 (Y)

Harness side 
connector 
(rear view)

<CLUB CAB>

AC903885AM

Connector: D-36 <LHD>

D-36 (Y)

Harness side 
connector 
(rear view)

<DOUBLE CAB>

AC903886 AH

Connector: D-36 <RHD>

D-36 (Y)

Harness side 
connector 
(rear view)

<DOUBLE CAB>

AC706606

AF

Locking button

(3) Disconnect side-airbag module (RH) connector 

TROUBLESHOOTING

SUPPLEMENTAL RESTRAINT SYSTEM (SRS)

52B-129

D-36. When disconnecting connector D-36, 
unlock the connector by sliding the locking button 
to the direction of the arrow as shown in the 
figure, and then disconnect the connector.

AC801564

Section
A - A

C-155 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 53, 54 and the short spring to 

release the short spring.

AC800962 BL

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.
(5) Resistance measurement between C-155 

harness side connector terminals 53 and 54.

OK: Open circuit

Q: Is the check result normal? 

YES : 

Go to Step 6

NO : 

Repair the harness wires between SRS-
ECU connector C-155 (terminal No.53 and 
54) and side-airbag module (RH) connector 
D-36 (terminal No.2 and 1).

STEP 6. Check whether the diagnosis code is 
reset.

Q: Is diagnosis code B1420 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-130

Code No.B1421: Side-airbag module (RH) (squib) system (open-circuited in 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 side-airbag module (RH) 
squib wire(s) are open-circuited.

PROBABLE CAUSES

• Open circuit in the side-airbag module (RH) 

(squib) circuit

• Improper connector contact

• Malfunction of the SRS-ECU