Mitsubishi L200. Manual - part 616

TROUBLESHOOTING

SUPPLEMENTAL RESTRAINT SYSTEM (SRS)

52B-135

DIAGNOSIS PROCEDURE

STEP 1. Check the diagnosis code by connecting 
a dummy resistor. (M.U.T.-III diagnosis code)
(1) Disconnect the negative battery terminal.

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

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

TROUBLESHOOTING

SUPPLEMENTAL RESTRAINT SYSTEM (SRS)

52B-136

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 B1422 set?

YES : 

Go to Step 2

NO : 

Replace the front seatback assembly (RH) 
(Refer to 

P.52B-276

). 

TROUBLESHOOTING

SUPPLEMENTAL RESTRAINT SYSTEM (SRS)

52B-137

STEP 2. Resistance 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 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-138

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 BN

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, 54 and 
body earth.

OK: Open circuit

Q: Is the check result normal? 

YES : 

Go to Step 3

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 3. Check whether the diagnosis code is 
reset.

Q: Is diagnosis code B1422 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 ).