Mitsubishi L200. Manual — part 640

TROUBLESHOOTING

SUPPLEMENTAL RESTRAINT SYSTEM (SRS)

52B-231

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

AE

Harness side
connector
(front view)

Connectors: D-15 <LHD>, D-23 <RHD>

Centre

pillar

D-23 (B)
D-15 (B)

AC300147AV

Seat belt
pre-tensioner
connector

Flat-tipped
screwdriver

Locking button

Harness side connector

(2) Disconnect seat belt pre-tensioner (driver's side)

connector D-15 <LHD> or D-23 <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-15

<LHD> or D-23 <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 B1604 set?

YES :

Go to Step 2.

NO :

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

P.52B-284

).

STEP 2. Resistance measurement between SRS-
ECU connector C-155 (terminal No.51 and 52)
and the seat belt pre-tensioner (driver's side)
connector D-15 <LHD> or D-23 <RHD> (terminal
No.2 and 1).
(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.

AC501889

AB

Harness side
connector
(front view)

Connector: D-15

D-15 (B)

Centre

pillar

AC300147AV

Seat belt
pre-tensioner
connector

Flat-tipped
screwdriver

Locking button

Harness side connector

DANGER

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

(3) Disconnect seat belt pre-tensioner (driver's side)

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

TROUBLESHOOTING

SUPPLEMENTAL RESTRAINT SYSTEM (SRS)

52B-232

disconnect the connector.

AC801564

Section
A - A

C-155 Harness side connectors
(front view)

Cable tie

Terminal

7 mm or more

AG

Short spring

A

A

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 51, 52 and the short spring to
release the short spring.

AC201287CQ

H

arness side

connector

MB991884

(5) Connect D-15 <LHD> or D-23 <RHD> harness

side connector to special tool resistor harness

(MB991884).

AC800962 CB

C-155 Harness side
connector (rear view)

Special tool
MB991884

CAUTION

Do not insert a test probe into the terminal from
its front side directly as the connector contact
pressure may be weakened.
(6) Resistance measurement between the following

terminals.

• SRS-ECU connector C-155 terminal No.51

and special tool terminal No.1

• SRS-ECU connector C-155 terminal No.52

and special tool terminal No.2

OK: Continuity (Less than 2

Ω)

Q: Are the check results normal?

YES :

Go to Step 3.

NO :

Repair the harness wires between SRS-
ECU connector C-155 (terminal No.51 and
52) and the seat belt pre-tensioner (driver's
side) connector D-15 <LHD> or D-23
<RHD> (terminal No.2 and 1)

STEP 3. Check whether the diagnosis code is
reset.

Q: Is diagnosis code No.B1604 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-233

Code No.B1605: Seat belt pre-tensioner (driver's side) (squib) system (short-circuited to the earth)

AC806068

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

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

AB

SEAT BELT
PRE-TENSIONER

<LHD>
<RHD>

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 the seat belt pre-ten-
sioner (driver'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

(driver's side) (squib) harness

• Malfunction of the SRS-ECU

TROUBLESHOOTING

SUPPLEMENTAL RESTRAINT SYSTEM (SRS)

52B-234

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

AE

Harness side
connector
(front view)

Connectors: D-15 <LHD>, D-23 <RHD>

Centre

pillar

D-23 (B)
D-15 (B)

AC300147AV

Seat belt
pre-tensioner
connector

Flat-tipped
screwdriver

Locking button

Harness side connector

(2) Disconnect seat belt pre-tensioner (driver's side)

connector D-15 <LHD> or D-23 <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-15

<LHD> or D-23 <RHD> harness side connector.

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

diagnosis code.

Q: Is diagnosis code B1605 set?

YES :

Go to Step 2.

NO :

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

P.52B-284

).

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.

AC501889

AE

Harness side
connector
(front view)

Connectors: D-15 <LHD>, D-23 <RHD>

Centre

pillar

D-23 (B)
D-15 (B)

AC300147AV

Seat belt
pre-tensioner
connector

Flat-tipped
screwdriver

Locking button

Harness side connector

DANGER

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

(3) Disconnect seat belt pre-tensioner (driver's side)

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