Mitsubishi L200. Manual - part 602

TROUBLESHOOTING

SUPPLEMENTAL RESTRAINT SYSTEM (SRS)

52B-79

disconnect the connector.

AC300977

Section
A - A

C-130 Harness side connector
(front view)

Cable tie

Short spring

4 mm or more

Terminal

A

A

AE

CAUTION

Insert an insulator such as a cable tie to a depth 
of 4mm or more, otherwise the short spring will 
not be released.
(4) Insert a cable tie [3 mm wide, 0.5 mm thick] 

between terminals 29, 30 and the short spring to 
release the short spring.

(5) Connect the negative battery terminal.

(6) Turn the ignition switch to the "ON" position.

AC501405

C-130 Harness side 
connector (rear view)

AC501405 AB

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-130 harness 

side connector terminals 29, 30 and body earth.

OK: 1 V or less

Q: Is the measured voltage within the specified 

range?
YES : 

Go to Step 3 .

NO : 

Repair the harness wire between SRS-ECU 
connector C-130 (terminal No.29 and 30) 
and the seat belt pre-tensioner (driver's 
side) connector D-15 <LHD> or D-23 
<RHD> (terminal No.1 and 2)

STEP 3. Check whether the diagnosis code is 
reset.

Q: Is diagnosis code B1606 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-80

Code No.B1609: Seat belt pre-tensioner (passenger's side) (squib) system (short-circuit between 
terminals of the squib circuit)

AC805785

SRS-ECU

CONNECTOR
LOCK SWITCH

CONNECTOR
LOCK SWITCH

NOTE

: 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

AE

SEAT BELT 
PRE-TENSIONER 

CONNECTOR
LOCK SWITCH

<RHD>
<LHD>

Seat Belt Pre-tensioner (Passenger's Side)  (Squib)

OPERATION
The SRS-ECU judges how severe a collision is by 
detecting signals from the front impact sensors and 
the front air bag analogue G-sensor. If the impact is 
over a predetermined level, the SRS-ECU sends an 
ignition signal. At this time, if the front air bag safing 
G-sensor is on, the seat belt pre-tensioner will 
deploy. 

DIAGNOSIS CODE SET CONDITIONS
This diagnosis code is set if one seat belt pre-ten-
sioner (passenger's side) squib wire shorted to the 
other. 

PROBABLE CAUSES

• Improper engaged connector or defective short 

spring*

• Short circuit between the seat belt pre-tensioner 

(passenger's side) (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 disconnected). 
Therefore, if connector C-123, C-130 or D-23 <LHD> 
or D-15 <RHD> is damaged or improperly engaged, 
the short spring may not be released when the con-
nector 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.

TROUBLESHOOTING

SUPPLEMENTAL RESTRAINT SYSTEM (SRS)

52B-81

STEP 2. Connector lock check: SRS-ECU 
connector C-130. (M.U.T.-III diagnosis code)
(1) Disconnect the negative battery terminal.

AC501670

AC

C-130 (Y)

Connector: C-130

Harness side 
connector 
(rear view)

(2) Disconnect the connectors C-130 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 B1609 set?

YES : 

Go to Step 3.

NO : 

The procedure is complete. It is assumed 
that diagnosis code B1609 set as connector 
C-130 was engaged improperly.

STEP 3. Connector lock check: Intermediate 
connector C-123, SRS-ECU connector C-130 and 
seat belt pre-tensioner (passenger's side) 
connector D-23 <LHD> or D-15 <RHD>. (M.U.T.-III 
diagnosis code)
(1) Disconnect the negative battery terminal.

AC501670

AC

C-130 (Y)

Connector: C-130

Harness side 
connector 
(rear view)

(2) Disconnect the connectors C-130 and then 

reconnect them.

AC501889

AC511604

AD

Harness side 
connector 
(front view)

Connectors: D-23 <LHD>, D-15 <RHD>

D-15 (B)

Centre

pillar

D-23 (B)

AC300147AV

Seat belt 
pre-tensioner
connector

Flat-tipped 
screwdriver

Locking button

Harness side connector

(3) Disconnect connector D-23 <LHD> or D-15 

<RHD> and then reconnect them. Use a flat-
tipped screwdriver to pull out the locking button at 

TROUBLESHOOTING

SUPPLEMENTAL RESTRAINT SYSTEM (SRS)

52B-82

the harness side connector.

AC903853

Connector: C-123 <LHD>

BJ

C-123 (Y)

Intermediate 
connector 

AC903868

CD

Connector: C-123 <RHD>

C-123 (Y)

Intermediate 
connector 

AC600868

Outer housing of the intermediate connector 
(Instrument panel wiring harness side)

AH

(4) Disconnect connectors C-123, and then 

reconnect it. Slide the outer hosing of 
intermediate connector (instrument panel wiring 
harness side) C-123 in the arrow direction 
shown.

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

diagnosis code.

Q: Is diagnosis code B1609 set?

YES : 

Go to Step 4.

NO : 

The procedure is complete. It is assumed 
that diagnosis code B1609 set as connector 
C-123, C-130 or D-23 <LHD> or D-15 
<RHD> was engaged improperly.

STEP 4. Check the diagnosis code by connecting 
a dummy resistor. (M.U.T.-III diagnosis code)
(1) Disconnect the negative battery terminal.

AC501889

AC511604

AD

Harness side 
connector 
(front view)

Connectors: D-23 <LHD>, D-15 <RHD>

D-15 (B)

Centre

pillar

D-23 (B)

AC300147AV

Seat belt 
pre-tensioner
connector

Flat-tipped 
screwdriver

Locking button

Harness side connector

(2) Disconnect seat belt pre-tensioner (passenger's 

side) connector D-23 <LHD> or D-15 <RHD>. 
Use a flat-tipped screwdriver to pull out the 
locking button at the harness side connector, and 
then disconnect the connector.

AC501975

MB991865

(Dummy 

resistor : 3   )

MB991884 
(Resistor 
harness)

AF

Harness 
side connector

(3) Connect special tool dummy resistor (MB991865) 

to special tool resistor harness (MB991884).

(4) Connect special tool (MB991884) to the D-23 

<LHD> or D-15 <RHD> harness side connector.

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

the diagnosis code.

Q: Is diagnosis code B1609 set?

YES : 

Go to Step 5.

NO : 

Replace the seat belt with pre-tensioner 
(passenger's side) (Refer to 

P.52B-284

).