Mitsubishi L200. Manual — part 596

TROUBLESHOOTING

SUPPLEMENTAL RESTRAINT SYSTEM (SRS)

52B-55

and body earth.

OK: Open circuit

Q: Is the check result normal?

YES :

Check the other circuit, which flows through

fuse number 21.

NO :

Repair the wiring harness between junction
block connector C-208 (terminal No.8) and
SRS-ECU connector C-131 (terminal
No.13), and replace the fuse.

STEP 6. Check whether the diagnosis code is
reset.

Q: Is diagnosis code B1477 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 ).

Code No.B1509: Incorrect installation of SRS-ECU

DIAGNOSIS CODE SET CONDITIONS
This code is set when the vehicle specification does
not meet the ECU specification.

PROBABLE CAUSES
Malfunction of the SRS-ECU

DIAGNOSIS PROCEDURE

Replace the SRS-ECU (Refer to

P.52B-266

).

Code No.B1519: SRS-ECU connector lock out of order

DIAGNOSIS CODE SET CONDITIONS
This diagnosis code is set if a poor connection at the
SRS-ECU is detected.

PROBABLE CAUSES

• Damaged connectors

• Malfunction of the SRS-ECU

DIAGNOSIS PROCEDURE

STEP 1. Connector lock check: SRS-ECU
connectors C-130 and C-131. (M.U.T.-III diagnosis
code)
(1) Disconnect the negative battery terminal.

AC501670

AD

C-130 (Y)

Connectors: C-130, C-131

C-130 Harness
side connector
(rear view)

C-131 (Y)

C-131Harness side
connector (rear view)

(2) Disconnect SRS-ECU connectors C-130, C-131

and then reconnect them.

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

the diagnosis code.

Q: Is diagnosis code B1519 set?

YES :

Go to Step 2.

NO :

The procedure is complete. It is assumed
that diagnosis code B1519 set as
connectors C-130 and C-131 were engaged
improperly.

TROUBLESHOOTING

SUPPLEMENTAL RESTRAINT SYSTEM (SRS)

52B-56

STEP 2. Connector lock check: SRS-ECU
connectors C-130 and C-131.

AC501670

AD

C-130 (Y)

Connectors: C-130, C-131

C-130 Harness
side connector
(rear view)

C-131 (Y)

C-131Harness side
connector (rear view)

AC006249 AM

SRS-ECU Harness side connector
(front view)

Connector lock
switch terminal

(1) Disconnect SRS-ECU connectors C-130 and C-

131.

(2) Check the connector lock switch terminal inside

the harness side connector for improper contact
or deformation.

Q: Are the SRS-ECU connectors C-130 and C-131 in

good condition?
YES :

Go to Step 3.

NO :

Replace the SRS-ECU connector C-130
and C-131.

STEP 3. Check whether the diagnosis code is
reset.

Q: Is diagnosis code B1519 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-57

Code No. B1551: SRS warning lamp circuit malfunction (Lamp does not Illuminate).

AC806011

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

SRS Warning Lamp Drive Circuit

IGNITION
SWITCH (IG1)

COMBINATION
METER

SRS-ECU

AC

OPERATION

• Power for the SRS warning lamp is supplied from

the ignition switch (IG1) circuit.

• The SRS warning lamp illuminates when the igni-

tion switch is turned to the "ON" position and
goes out after approximately 7 seconds if there is
not a malfunction in the SRS system.

DIAGNOSIS CODE SET CONDITIONS
This diagnosis code will be set if the SRS warning
lamp driving circuit is short to earth.

PROBABLE CAUSES

• Damaged wiring harnesses of connectors

• Malfunction of the SRS-ECU

• Malfunction of the combination meter

TROUBLESHOOTING

SUPPLEMENTAL RESTRAINT SYSTEM (SRS)

52B-58

DIAGNOSIS PROCEDURE

STEP 1. Check the combination meter connector
C-112.

AC903856AR

Connector: C-112 <LHD>

Harness side
connector
(rear view)

AC903868

BD

Connector: C-112 <RHD>

Harness side
connector
(rear view)

Q: Is the connector correctly engaged?

YES :

Go to Step 2.

NO :

Engage the connector correctly. Then go to
Step 7.

STEP 2. Voltage measurement at combination
meter connector C-112.

AC903856AR

Connector: C-112 <LHD>

Harness side
connector
(rear view)

AC903868

BD

Connector: C-112 <RHD>

Harness side
connector
(rear view)

(1) Disconnect the combination meter connector C-

112.

(2) Connect the negative battery terminal.
(3) Turn the ignition switch to the "ON" position.
(4) Measure the voltage between C-112 harness

side connector terminal 36 and body earth.

OK: System voltage

Q: Is the check result normal?

YES :

Go to Step 4.

NO :

Go to Step 3.