Mitsubishi Outlander GS45X. Manual - part 41

HEADLIGHT

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CHASSIS ELECTRICAL

54A-161

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

CAUTION

To prevent damage to scan tool MB991958, always turn the
ignition switch to the "LOCK" (OFF) position before con-
necting or disconnecting scan tool MB991958.
(1) Connect scan tool MB991958. Refer to "How to connect

scan too (M.U.T.-III)

P.54A-123

(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 ETACS,

Diagnosis

P.54A-732

NO : Go to Step 2.

STEP 2. Using scan tool MB991958, check data list
Use the ETACS-ECU service data to check the signals related
to the operation of headlight function.

• Turn the headlight switch to the ON position.

• Turn the passing switch to the ON position.

Q: Do scan tool MB991958 display the items "Headlight

switch" and "Headlight switch (flasher)" as normal
condition?
YES : (Normal conditions are displayed for all items.) Go to

Step 3.

NO : (Normal condition is not displayed.) Troubleshoot the

ETACS-ECU. Refer to ETACS, Diagnosis

P.54A-785

ZC501967

AC404789

AC702802

MB991824

MB991827

MB991910

Data link

connector

Item No.

Item name

Normal
condition

Item 341

Headlight
switch

Item No.

Item name

Normal
condition

Item 350

Headlight
switch (flasher)

HEADLIGHT

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CHASSIS ELECTRICAL

54A-162

STEP 3. 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 4.
NO : Repair the damaged parts.

STEP 4. Check of headlight relay (HIGH)
Refer to

P.54A-219

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

YES : Go to Step 5.
NO : Replace the headlight relay (HIGH). Verify that the

high-beam headlights illuminate normally.

STEP 5. Check the battery power supply circuit to the
headlight relay (HIGH). Measure the voltage at headlight
relay (HIGH) connector A-20X

CAUTION

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

(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 6.
NO : Go to Step 8.

STEP 6. 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 7.
NO : Repair the damaged parts.

AC702831AE

Relay box side: A-20X

HEADLIGHT

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STEP 7. Check the wiring harness between headlight relay
(HIGH) connector A-20X (terminal 1) and ETACS-ECU
connector C-312 (terminal 13).

• Check the ground wires for open circuit.

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

connector A-20X (terminal 1) and ETACS-ECU
connector C-312 (terminal 13) in good condition?
YES : 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 high-beam headlights illuminate normally.

STEP 8. Check the wiring harness between headlight relay
(HIGH) connector A-20X (terminal 2/4) and the fusible link
(36).

• Check the power supply line for open circuit.

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

connector A-20X (terminal 2/4) and fusible link (36) in
good condition?
YES : Go to Step 9.
NO : The wiring harness may be damaged or the

STEP 9. Retest the system
Q: Do the headlights (high-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 3: The headlights illuminate at low-beam (high-beam does not illuminate)
regardless of the lighting switch positions.

CAUTION

Whenever the ECU is replaced, ensure that the power sup-
ply circuit, the ground circuit and the communication cir-
cuit are normal.

TECHNICAL DESCRIPTION (COMMENT)

If the headlights illuminate only at low-beam regardless of the
lighting switch position, the headlight fail-safe function may be
active.

HEADLIGHT

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CHASSIS ELECTRICAL

54A-164

TROUBLESHOOTING HINTS

• Malfunction of column switch

• Malfunction of the ETACS-ECU

• Damaged harness wires and connectors

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. Using scan tool MB991958, read the ETACS-ECU
diagnostic trouble code.

CAUTION

scan too (M.U.T.-III)

P.54A-123

(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 ETACS,

Diagnosis

P.54A-732

NO : Go to Step 2.

STEP 2. Retest the system
Q: Do the headlights illuminate normally?

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.

ZC501967