Mitsubishi Outlander GS45X. Manual — part 1479

SRS AIR BAG DIAGNOSIS

TSB Revision

SUPPLEMENTAL RESTRAINT SYSTEM (SRS)

52B-411

Inspection procedure 2: Power supply circuit system

.

IG1
RELAY

AC803172

SRS-ECU

AB

FUSIBLE
LINK

34

IGNITION
SWITCH (IG1)

IG1 Power Supply Circuit

ETACS-ECU

POWER
SUPPLY

AC901076

C-28 (Y)

AD

Connectors: C-27, C-28

C-27 (Y)

ACA02655AI

Connector: C-313

C-313 (BR)

SRS AIR BAG DIAGNOSIS

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SUPPLEMENTAL RESTRAINT SYSTEM (SRS)

52B-412

CIRCUIT OPERATION

To SRS-ECU, the power is supplied from two inde-
pendent circuits (fuse No. 12 and 18) via IG1 relay of
ETACS-ECU.
If the power is not supplied to SRS-ECU, the com-
munication between scan tool (M.U.T.-III Sub
Assembly) and SRS-ECU cannot be established.

.

TROUBLESHOOTING HINTS (THE MOST
LIKELY CAUSES FOR THIS CASE:)

• Damaged wiring harness or connector

• Charging system failed

• Malfunction of the SRS-ECU

• Malfunction of the ETACS-ECU

DIAGNOSIS

Required Special Tools:

• MB991958: Scan Tool (M.U.T.-III Sub Assembly)

• MB991824: Vehicle Communication Interface (V.C.I.)

• MB991827: M.U.T.-III USB Cable

• MB991910: M.U.T.-III Main Harness A (Vehicles with

CAN communication system)

STEP 1. Power supply fuse check.
Q: Is the fuse in good condition?

YES : Go to Step 3.
NO : Go to Step 2

STEP 2. Check for a blown fuse.
(1) Replace the fuse.
(2) Turn the ignition switch to the "ON" position, wait for at least

one minute and then turn the switch off.

(3) Check the fuse.
Q: Is the fuse in good condition?

YES : Go to Step 3.
NO : Repair the wiring harness between the C-313

ETACS-ECU connector terminal No. 4/2 and the C-27
SRS-ECU connector terminal No. 61/62, and replace
the power supply fuse.

STEP 3. Resistance measurement at the-28 SRS-ECU
connectors
(1) While pushing the part "A" indicated in the figure of the

harness side connector, turn the lock lever to the direction
of the arrow to release the lock lever, and disconnect the
C-28 SRS-ECU connectors.

AC506734

A

AD

Lock lever

SRS AIR BAG DIAGNOSIS

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SUPPLEMENTAL RESTRAINT SYSTEM (SRS)

52B-413

(2) Take the measurements below at the C-28 wiring harness

side connectors.

• Continuity between C-28 wiring harness side connector

terminal No. 17 and body ground

OK: Continuity (Less than 2 ohms)

Q: Is the check result normal?

YES : Go to Step 4.
NO : Repair the wiring harness between C-28 SRS-ECU

connector terminal No. 17 and body ground.

STEP 4. Measure the voltage at the C-27 SRS-ECU
connector.
(1) Disconnect the negative battery terminal.
(2) While pushing the part "A" indicated in the figure of the

harness side connector, turn the lock lever to the direction
of the arrow to release the lock lever, and disconnect the
C-27 SRS-ECU connector.

(3) Connect the negative battery terminal.
(4) Ignition switch: ON

(5) Take the measurements below at the C-27 harness side

connector.

• Voltage between terminal No. 61, 62 and body ground

OK: 9 V or more

Q: Is the measured voltage within the specified range?

YES : Go to Step 6.
NO : Go to Step 5.

AC608812

C-28 Harness side
connector (front view)

HG

AC507645

A

AB

Lock lever

AC608813

C-27 Harness side
connector (front view)

BQ

SRS AIR BAG DIAGNOSIS

TSB Revision

SUPPLEMENTAL RESTRAINT SYSTEM (SRS)

52B-414

STEP 5. Check the harness for open circuit between
SRS-ECU connector C-27 (terminal No.61 and 62) and the
ETACS-ECU connector C-313 (terminal No.4 and 2).
(1) Disconnect the negative battery terminal.
(2) While pushing the part "A" indicated in the figure of the

harness side connector, turn the lock lever to the direction
of the arrow to release the lock lever, and disconnect the
C-27 SRS-ECU connector.

(3) Disconnect the ETACS-ECU connector C-313.

(4) Check for continuity between the following terminals. It

should be less than 2 ohms.

<Fuse No.12>

• SRS-ECU connector C-27 (terminal No.62) and the

ETACS-ECU connector C-313 (terminal No.2)

<Fuse No.18>

• SRS-ECU connector C-27 (terminal No.61) and the

ETACS-ECU connector C-313 (terminal No.4)

Q: Does continuity exist?

YES : Replace the ETACS-ECU (Refer to GROUP 54A,

ETACS-ECU

P.54A-826

).

NO : Repair the harness wire between SRS-ECU

connector C-27 and the ETACS-ECU connector
C-313.

STEP 6. Retest the system
Q: Is the communication between scan tool and SRS-ECU

possible?
YES : Intermittent malfunction (Refer to GROUP 00, How to

Use Troubleshooting/Inspection Service Points

−How

to Cope with Intermittent Malfunction

P.00-15

.)

NO : Replace SRS-ECU. (Refer to

P.52B-436

.)

AC507645

A

AB

Lock lever

AC608812DO

C-27 Harness
side connector
(front view)

C-313 Harness side

connector (front view)