Mitsubishi Outlander GS45X. Manual - part 40

HEADLIGHT

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STEP 3. Check headlight relay (LOW) connector A-28X for 
loose, corroded or damaged terminals, or terminals 
pushed back in the connector.
Q: Is headlight relay (LOW) connector A-28X in good 

condition?
YES : Go to Step 4.
NO :  Repair the damaged parts.

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

CAUTION

The top and bottom of the headlight relay (LOW) are diffi-
cult 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.

(2) Measure the voltage between terminal 2/4 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.

AC702831CL

Relay box side: A-28X

HEADLIGHT

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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 (Vehicles without discharge headlight) : Go to Step 

8.

YES (Vehicles with discharge headlight) : Go to Step 9.
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 2/4) 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 2/4) and fusible link (36) in 
good condition?
YES (Vehicles without discharge headlight) : Go to Step 

8.

YES (Vehicles with discharge headlight) : Go to Step 9.
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 8. Substitute a known good headlight relay (LOW), 
and check the trouble symptom.
Q: Do the headlights (low-beam) illuminate in good 

condition?
YES : Replace the headlight relay (LOW).
NO :  Replace the ETACS-ECU.

STEP 9. Check of headlight relay (LOW).
Refer to 

P.54A-219

.

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

YES : Go to Step 10.
NO :  Replace the headlight relay (LOW). Verify that the 

low-beam headlights illuminate normally.

HEADLIGHT

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STEP 10. Retest the system
Q: Do the headlights (low-beam) 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: None of headlights (high-beam) illuminates.

CAUTION

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

AC702957

Headlight Relay (High-Beam) Circuit

ETACS-ECU

FUSIBLE
LINK

36

HEADLIGHT
RELAY (HIGH)

RELAY BOX
 ENGINE 
 COMPARTMENT

AB

HEADLIGHT

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.

TECHNICAL DESCRIPTION (COMMENT)

If none of headlights (high-beam) illuminates, 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)

AC709504

AC

Connector: A-20X <2.4L Engine>

AC702950 AK

Connector: A-20X <3.0L Engine>

ACA02655AW

Connector: C-312