Mitsubishi L200. Manual — part 604

TROUBLESHOOTING

SUPPLEMENTAL RESTRAINT SYSTEM (SRS)

52B-87

Code No.B1611: Seat belt pre-tensioner (passenger's side) (squib) system (short-circuited to the
earth)

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 seat belt pre-tensioner
(passenger's side) wire(s) are short-circuited to the
earth.

PROBABLE CAUSES

• Damaged wiring harnesses or connectors

• Short to the earth in the seat belt pre-tensioner

(passenger's side) (squib) harness

• Malfunction of the SRS-ECU

TROUBLESHOOTING

SUPPLEMENTAL RESTRAINT SYSTEM (SRS)

52B-88

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.

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 B1611 set?

YES :

Go to Step 2.

NO :

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

P.52B-284

).

STEP 2. Resistance measurement at the SRS-
ECU connector C-130
(1) Disconnect the negative battery terminal.

AC501670

AC

C-130 (Y)

Connector: C-130

Harness side
connector
(rear view)

(2) Disconnect SRS-ECU connector C-130.

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

DANGER

To prevents the seat belt pre-tensioner from
deploying unintentionally, disconnect the
seat belt pre-tensioner (passenger's side)
connector D-23 <LHD> or D-15 <RHD> to
short the squib circuit.

(3) 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

TROUBLESHOOTING

SUPPLEMENTAL RESTRAINT SYSTEM (SRS)

52B-89

then disconnect the connector.

AC300994

AB

AE

A

A

C-130 Harness side
connector (front view)

Terminal

Cable tie

Short spring

4 mm or more

Section
A - A

CAUTION

Insert an insulator such as a cable tie to a depth
of 4 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 27, 28 and the short spring to
release the short spring.

AC501390

C-130 Harness side
connector (rear view)

AE

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-130

harness side connector terminals 27, 28 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-130 (terminal No.27 and
28) and the seat belt pre-tensioner
(passenger's side) connector D-23 <LHD>
or D-15 <RHD> (terminal No.2 and 1)

STEP 3. Check whether the diagnosis code is
reset.

Q: Is diagnosis code B1611 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-90

Code No.B1612: Seat belt pre-tensioner (passenger's side) (squib) system (short-circuited to the
power supply)

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 seat belt pre-tensioner
(passenger's side) wire(s) are short-circuited to the
power supply.

PROBABLE CAUSES

• Damaged wiring harnesses or connectors

• Short to the power supply in the seat belt pre-ten-

sioner (passenger's side) (squib) harness

• Malfunction of the SRS-ECU