Mitsubishi Outlander XL. Manual — part 989

STEP 4. Check the battery power supply circuit to the
headlight relay (LOW). Measure the voltage at headlight
relay (LOW) connector A-28X.

The top and bottom of the headlight relay (LOW) are difficult
to identify. Prior to inspection, confirm the triangle mark on
the relay box.

(1)

Disconnect headlight relay (LOW) connector A-28X and
measure the voltage available at the relay box side of the
connector.

ZC5010400051

Relay box side: A-28X

(2)

Measure the voltage between terminal 4 and ground.

｠

The voltage should measure approximately 12 volts
(battery positive voltage).

Q:Is the measured voltage approximately 12 volts (battery

positive voltage)?

YES:

Go to Step 5.

NO:

Go to Step 7.

STEP 5. Check ETACS-ECU connector C-312 for loose,
corroded or damaged terminals, or terminals pushed back
in the connector.

Q:Is ETACS-ECU connector C-312 in good condition?

YES:

Go to Step 6.

NO:

Repair the damaged parts.

STEP 6. Check the wiring harness between headlight relay
(LOW) connector A-28X (terminal 1) and ETACS-ECU
connector C-312 (terminal 6).

｠

Check the ground wires for open circuit.

Q:Is the wiring harness between headlight relay (LOW)

connector A-28X (terminal 1) and ETACS-ECU connector

C-312 (terminal 6) in good condition?

YES:

Go to Step 8.

NO:

The wiring harness may be damaged or the connector

(s) may have loose, corroded or damaged terminals, or
terminals pushed back in the connector. Repair the wiring
harness as necessary. Verify that the low-beam headlights
illuminate normally.

STEP 7. Check the wiring harness between headlight relay
(LOW) connector A-28X (terminal 4) and the fusible link (36).

｠

Check the power supply line for open circuit.

Q:Is the wiring harness between headlight relay (LOW)

connector A-28X (terminal 4) and fusible link (36) in good

condition?

YES:

Go to Step 8.

NO:

The wiring harness may be damaged or the connector

(s) may have loose, corroded or damaged terminals, or
terminals pushed back in the connector. Repair the wiring

LIGHTING

54Ac-29

DIAGNOSIS

harness as necessary. Verify that the low-beam headlights
illuminate normally.

STEP 8. Check the column switch (switch body).
Refer to GROUP 54Ah - Inspection P.54Ah-9.

Q:Is the column switch (switch body) in good condition?

YES:

Go to Step 9.

NO:

Replace the column switch. Verify that the low-beam

headlights illuminate normally.

STEP 9. Retest the system

Q:Does the headlights (low-beam) do not illuminate in good

condition?

YES:

The trouble can be an intermittent malfunction

(Refer to GROUP 00, How to use Troubleshooting/inspection
Service Points - How to Cope with Intermittent
Malfunction P.00-15).

NO:

Replace the ETACS-ECU.

Inspection Procedure 2: Headlights (high-beam) do not illuminate.

M15410900097USA0000010000

Whenever the ECU is replaced, ensure that the
power supply circuit, the ground circuit and the
communication circuit are normal.

Headlight Relay (High-Beam) Circuit

ETACS-ECU

FUSIBLE
LINK

36

HEADLIGHT
RELAY (HIGH)

RELAY BOX
ENGINE
COMPARTMENT

54Ac-30

LIGHTING

DIAGNOSIS

ZC6041270001

Connector: A-20X

ZC600878003

Connector: C-312

C-312

TECHNICAL DESCRIPTION (COMMENT)
If both headlights (high-beam) do not illuminate
normally, the headlight switch input circuit, headlight
relay (HIGH), or ETACS-ECU may have a problem.

TROUBLESHOOTING HINTS

｠

Malfunction of column switch

｠

Malfunction of headlight relay (HIGH)

｠

Malfunction of the ETACS-ECU

｠

Damaged harness wires and connectors

DIAGNOSIS

Required Special Tools:

｠

MB992006: Extra fine probe

｠

MB991223: Harness set

｠

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)

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54Ac-31

DIAGNOSIS

STEP 1. Using scan tool MB991958, read the diagnostic
trouble code.

ZC501967

AC404789

ZC5019680000

MB991824

MB991827

MB991910

Data link

connector

To prevent damage to scan tool MB991958, always turn the
ignition switch to the "LOCK" (OFF) position before
connecting or disconnecting scan tool MB991958.

(1)

Connect scan tool MB991958. Refer to "How to connect scan
too (M.U.T.-III) P.54Ac-11."

(2)

Turn the ignition switch to the "ON" position.

(3)

Check whether the ETACS-ECU related DTC is set.

(4)

Turn the ignition switch to the "LOCK" (OFF) position.

Q:Is the DTC set?

YES:

Diagnose the ETACS-ECU. Refer to GROUP 54Ad,

Diagnosis P.54Ad-8.

NO:

Go to Step 2.

STEP 2. Check headlight relay (HIGH) connector A-20X for
loose, corroded or damaged terminals, or terminals pushed
back in the connector.

Q:Is headlight relay (HIGH) connector A-20X in good

condition?

YES:

Go to Step 3.

NO:

Repair the damaged parts.

STEP 3. Check of headlight relay (HIGH)
Refer to P.54Ac-173.

Q:Is the headlight relay (HIGH) in good condition?

YES:

Go to Step 4.

NO:

Replace the headlight relay (HIGH). Verify that the

high-beam headlights illuminate normally.

STEP 4. Check the battery power supply circuit to the
headlight relay (HIGH). Measure the voltage at headlight
relay (HIGH) connector A-20X

The top and bottom of the headlight relay (HIGH) are difficult
to identify. Prior to inspection, confirm the triangle mark on
the relay box.

(1)

Disconnect headlight relay (HIGH) connector A-20X and
measure the voltage available at the relay box side of the
connector.

54Ac-32

LIGHTING

DIAGNOSIS