Mitsubishi L200. Manual — part 634

TROUBLESHOOTING

SUPPLEMENTAL RESTRAINT SYSTEM (SRS)

52B-207

STEP 2. Voltage measurement at the SRS-ECU
connector C-153.
(1) Disconnect the negative battery terminal.

AC801404

AL

Connector: C-153

C-153 (Y)

Harness side
connector
(rear view)

(2) Disconnect SRS-ECU connector C-153.

DANGER

To prevents the air bag from deploying unin-
tentionally, disconnect the curtain air bag
module (LH) connector D-33 to short the
squib circuit.

AC903885AR

Connector: D-33 <LHD>

Harness side
connector
(rear view)

D-33 (B)

AC903886 AM

Connector: D-33 <RHD>

Harness side
connector
(rear view)

D-33 (B)

AC609928AM

Locking
button

Flat-tipped
screwdriver

Inflator

D-33 Harness side
connector (2-pin, black)

(3) Use the flat-tipped screwdriver to pull out the

locking button of D-33 harness side connector to
the direction of the arrow. After releasing the lock,
disconnect the connector.

AC801566

Section
A - A

C-153 Harness side connectors
(front view)

Cable tie

Terminal

7 mm or more

AF

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 1, 2 and the short spring to
release the short spring.

(5) Connect the negative battery terminal.
(6) Turn the ignition switch to the "ON" position.

AC800963AS

C-153 Harness side
connector (rear view)

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-153 harness

side connector terminals 1, 2 and body earth.

OK: 1 V or less

Q: Is the check result normal?

YES :

Go to Step 3.

NO :

Repair the harness wires between SRS-
ECU connector C-153 (terminal No.1 and 2)
and curtain air bag module (LH) connector
D-33 (terminal No.1 and 2).

STEP 3. Check whether the diagnosis code is
reset.

Q: Is diagnosis code B1453 set?

TROUBLESHOOTING

SUPPLEMENTAL RESTRAINT SYSTEM (SRS)

52B-208

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.B1476: Power supply voltage (IG1 (A) voltage) drops abnormally.

AC801171

IGNITION
SWITCH (IG1)

SRS-ECU

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-ECU Power Supply Circuit

AC

OPERATION

• The SRS-ECU is powered from the ignition

switch (IG1).

• The SRS-ECU power is supplied from two cir-

cuits. Even if one circuit is shut off, the air bag
can inflate.

DIAGNOSIS CODE SET CONDITIONS
This diagnosis code is set if the voltage between the
IG1 terminals (fuse No.15 circuit) and earth is lower
than a predetermined value for a continuous period
of 5 seconds or more.

PROBABLE CAUSES

• Damaged wiring harnesses or connectors

• Malfunction of the SRS-ECU

TROUBLESHOOTING

SUPPLEMENTAL RESTRAINT SYSTEM (SRS)

52B-209

DIAGNOSIS PROCEDURE

STEP 1. Check junction block fuse number 15.

AC509744

AD

Fuse No.15

Junction
block

<LHD>

AD

AC502795

AC

Fuse No.15

Junction
block

<RHD>

Q: Is the fuse burned out?

YES :

Go to Step 4.

NO :

Go to Step 2.

STEP 2. Voltage measurement at the SRS-ECU
connector C-154.
(1) Disconnect the negative battery terminal.

AC801404

AJ

Connector: C-154

C-154 (Y)

Harness side
connector
(rear view)

(2) Disconnect SRS-ECU connector C-154.
(3) Connect the negative battery terminal.
(4) Turn the ignition switch to the "ON" position.

AC800963AT

C-154 Harness side
connector (rear view)

CAUTION

Do not insert a test probe into the terminal from
its front side directly as the connector contact
pressure may be weakened.
(5) Voltage measurement between C-154 harness

side connector terminal 37 and body earth.

OK: 9 V or more.

Q: Is the check result normal?

YES :

Go to Step 6.

NO :

Go to Step 3.

TROUBLESHOOTING

SUPPLEMENTAL RESTRAINT SYSTEM (SRS)

52B-210

STEP 3. Connector check: SRS-ECU connector
C-154, junction block connector C-207 and C-208.

AC801404

AJ

Connector: C-154

C-154 (Y)

Harness side
connector
(rear view)

AC509934

Connectors: C-207, C-208 <LHD>

Junction block (Front view)

C-207

C-208

C-208

C-207

AB

Harness side

Harness side

AC509936

Connectors: C-207, C-208 <RHD>

C-207

C-208

C-207

Harness side

Harness side

C-208

AB

Junction block
(Front view)

Q: Is the check result normal?

YES :

Check the harness wires for open or short

circuit between SRS-ECU connector C-154
(terminal No.37) and ignition switch, and
repair if necessary.

NO :

Replace it.

STEP 4. Check a burned-out fuse.
(1) Replace the fuse.
(2) Turn the ignition switch to the "ON" position, wait

for at least one minute and then turn the ignition
switch to the "LOCK" (OFF) position.

(3) Check the fuse.

Q: Is the fuse in good condition?

YES :

This diagnosis is complete.

NO :

Go to Step 5.

STEP 5. Resistance measurement at the junction
block connector C-208.

AC801404

AJ

Connector: C-154

C-154 (Y)

Harness side
connector
(rear view)

(1) Disconnect SRS-ECU connector C-154.

AC509934

Connectors: C-208 <LHD>

Junction block (Front view)

C-208

AE

Harness side

AC509936

Connector: C-208 <RHD>

Harness side

C-208

AD

Junction block
(Front view)

(2) Disconnect junction block connector C-208, and

measure at the wiring harness side.

AC501390AB

C-208 Harness side connector (rear view)

CAUTION

Do not insert a test probe into the terminal from
its front side directly as the connector contact
pressure may be weakened.
(3) Resistance measurement between terminal 5