Mitsubishi Outlander GS45X. Manual - part 45

HEADLIGHT

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CHASSIS ELECTRICAL

54A-177

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TECHNICAL DESCRIPTION (COMMENT) 

If the daytime running light function does not work, 
connector(s), wiring harness in the CAN bus lines, 
the engine control module, the combination meter, 
the headlight relay (LOW), the ETACS-ECU or the 
input signal circuit may be defective.

.

TROUBLESHOOTING HINTS

• Trouble in input signal system

• Malfunction of headlight relay (LOW)

• Malfunction of the ETACS-ECU

• Damaged harness wires and connectors

DIAGNOSIS

Required Special Tools:

• MB991223: Harness Set

• MB992006: Extra Fine Probe

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

• MB991824: V.C.I.

• MB991827: M.U.T.-III USB Cable

• MB991910: M.U.T.-III Main Harness A

STEP 1. Verify the headlight (low-beam) operation.
Check to see that the headlight (low-beam) lights up properly 
when operating the dimmer switch while the headlight switch is 
ON.
Q: Do the headlights (low-beam) illuminate normally?

YES : Go to Step 2.
NO :  Refer to Inspection Procedure 1 "None of headlights 

(low-beam) illuminates 

P.54A-154

." 

AC709504

AB

Connector: A-28X <2.4L Engine>

AC702950 AJ

Connector: A-28X <3.0L Engine>

AC901112

A-56 (B)

Connectors: A-37, A-56

AR

A-37 (B)

ACA02655AW

Connector: C-312

HEADLIGHT

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STEP 2. Using scan tool MB991958, diagnose the CAN bus 
line.

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) Diagnose the CAN bus line.
(4) Turn the ignition switch to the "LOCK" (OFF) position.
Q: Is the CAN bus line found to be normal?

YES : Go to Step 3.
NO :  Repair the CAN bus line (Refer to GROUP 54C, 

Diagnosis 

P.54C-17

).

STEP 3. Using scan tool MB991958, read the ETACS-ECU 
diagnostic trouble code.
Check whether ETACS-ECU DTCs are set.
(1) Turn the ignition switch to the "ON" position.
(2) Check for ETACS-ECU DTCs.
(3) 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 4.

STEP 4. Using scan tool MB991958, read the MFI system 
diagnostic trouble code.
Check whether engine control module DTCs are set or not.
(1) Turn the ignition switch to the "ON" position.
(2) Check for engine control module DTCs.
(3) Turn the ignition switch to the "LOCK" (OFF) position.
Q: Is the DTC set?

YES : Diagnose the MFI system. Refer to GROUP 13A, 

Diagnosis 

P.13A-49

. <2.4 L Engine>, GROUP 13B, 

Diagnosis 

P.13B-50

. <3.0 L Engine>

NO :  Go to Step 5.

AC608435

Data link connector

MB991827

MB991824

MB991910

AB

HEADLIGHT

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STEP 5. Check the parking brake switch.
Check the input signals from the parking brake switch.
(1) Turn the ignition switch to the "ON" position.
(2) Check that the brake warning light on the combination 

meter goes off when the parking brake lever is released.

(3) Turn the ignition switch to the "LOCK" (OFF) position.
Q: Does the brake warning light go off?

YES : Go to Step 6.
NO :  Refer to GROUP 36, Diagnosis, Inspection Procedure 

2 

P.36-5

. Verify that the daytime running light function 

does not work normally.

STEP 6. Temporarily replace the headlight relay (LOW), 
and retest the system.
After temporarily replacing the headlight relay (LOW), with the 
ignition switch being in the ON position (engine is running), 
release the parking brake (parking brake switch: OFF) and turn 
the lighting switch to the OFF or TAIL position, and then check 
if the headlights (low-beam) illuminate with a reduced beam 
state.
Q: Do the headlights (low-beam) illuminate in good 

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

HEADLIGHT

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Inspection Procedure 8: Daytime running light function does not work normally. <Discharge type 
headlight>

CAUTION

Whenever the ECU is replaced, ensure that the 
input and output signal circuits are normal.

Daytime Running Light Circuit

FUSIBLE
LINK

36

DAYTIME 
RUNNING 
LIGHT RELAY

HEADLIGHT
ASSEMBLY

(DRL:LH) (DRL:RH)

RELAY BOX

ENGINE 
COMPARTMENT

ETACS-ECU