Mitsubishi L200. Manual - part 639

 

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Mitsubishi L200. Manual - part 639

 

 

TROUBLESHOOTING

SUPPLEMENTAL RESTRAINT SYSTEM (SRS)

52B-227

STEP 2. Connector lock check: SRS-ECU 
connector C-155. (M.U.T.-III diagnosis code)
(1) Disconnect the negative battery terminal.

AC801404

AK

Connector: C-155

C-155 (Y)

Harness side 
connector 
(rear view)

(2) Disconnect the connectors C-155 and then 

reconnect it.

(3) Connect the negative battery terminal.
(4) Erase the diagnosis code memory, and check the 

diagnosis code.

Q: Is diagnosis code B1603 set?

YES : 

Go to Step 3.

NO : 

The procedure is complete. It is assumed 
that diagnosis code B1603 set as connector 
C-155 was engaged improperly.

STEP 3. Connector lock check: SRS-ECU 
connector C-155 and seat belt pre-tensioner 
(driver's side) connector D-15 <LHD> or D-23 
<RHD>. (M.U.T.-III diagnosis code)
(1) Disconnect the negative battery terminal.

AC801404

AK

Connector: C-155

C-155 (Y)

Harness side 
connector 
(rear view)

(2) Disconnect the connectors C-155 and then 

reconnect them.

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

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

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

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

diagnosis code.

Q: Is diagnosis code B1603 set?

YES : 

Go to Step 4.

NO : 

The procedure is complete. It is assumed 
that diagnosis code B1603 set as connector 
C-155 or D-15 <LHD> or D-23 <RHD> was 
engaged improperly.

TROUBLESHOOTING

SUPPLEMENTAL RESTRAINT SYSTEM (SRS)

52B-228

STEP 4. 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 B1603 set?

YES : 

Go to Step 5.

NO : 

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

P.52B-284

).

STEP 5. 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 

TROUBLESHOOTING

SUPPLEMENTAL RESTRAINT SYSTEM (SRS)

52B-229

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

CAUTION

Do not insert a test probe into the terminal from 
its front side directly as the connector contact 
pressure may be weakened.

AC800962 CA

C-155 Harness side 
connector (rear view)

(5) Resistance measurement between C-155 

harness side connector terminals 51 and 52

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.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 6. Check whether the diagnosis code is 
reset.

Q: Is diagnosis code B1603 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-230

 Code No.B1604: Seat belt pre-tensioner (driver's side) (squib) system (open-circuited in the squib 
circuit)

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 seat belt pre-tensioner 
(driver's side) squib wire(s) are open-circuited.

PROBABLE CAUSES

• Improper connector contact

• Open circuit in the seat belt pre-tensioner 

(driver's side) (squib) circuit

• Malfunction of the SRS-ECU

 

 

 

 

 

 

 

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