Mitsubishi Evolution X. Manual - part 946

HEADLIGHT

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CHASSIS ELECTRICAL

54A-145

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 the 

Scan Tool (M.U.T.-III) 

P.54A-105

."

(2) Turn the ignition switch from "LOCK" (OFF) position to "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-14

).

STEP 3. Using scan tool MB991958, read the ETACS-ECU 
diagnostic trouble code.
(1) Connect scan tool MB991958. Refer to "How to connect 

scan tool (M.U.T.-III) 

P.54A-105

."

(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-582

.

NO :  Go to Step 4.

STEP 4. Using scan tool MB991958, check actuator test.
(1) Turn the ignition switch to the "ON" position.
(2) Perform the actuator test for the combination meter, and 

check that the high-beam indicator light illuminates (Refer 
to combination meter 

P.54A-82

).

(3) Turn the ignition switch to the "LOCK" (OFF) position.
Q: Is the check result normal?

YES : Replace the ETACS-ECU.
NO :  Replace the combination meter.

AC608435

Data link connector

MB991827

MB991824

MB991910

AB

HEADLIGHT

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CHASSIS ELECTRICAL

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Inspection Procedure 7: The headlight automatic shutdown function does not work normally.

CAUTION

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

.

OPERATION

The ETACS-ECU operates this function in accor-
dance with the input signals from column switch 
(lighting switch), ignition switch (IG1), and front door 
switch (LH).

.

TECHNICAL DESCRIPTION (COMMENT)

If the headlight automatic shutdown function does 
not work normally, the above described input circuits 
or ETACS-ECU may have a problem. Also, it may be 
possible that the headlight automatic shutdown func-
tion is set to "Disable" through configuration function.

.

TROUBLESHOOTING HINTS

• Malfunction of front door switch (LH)

• Malfunction of the ETACS-ECU

• The wiring harness or connectors may have 

loose, corroded, or damaged terminals, or termi-
nals pushed back in the connector

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)

HEADLIGHT

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STEP 1. Using scan tool MB991958, Check the 
configuration function.
Use the ETACS-ECU configuration function to check that the 
"Head light auto cut customize" is set to "C-spec."

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 the 

scan tool (M.U.T.-III) 

P.54A-105

."

(2) Turn the ignition switch to the "ON" position.
(3) Use the ETACS-ECU configuration function to check that 

the "Headlight auto cut customize" is set to "C-spec."

(4) Turn the ignition switch to the "LOCK" (OFF) position.
Q: Is the check result normal?

YES : Go to Step 2.
NO :  Use the ETACS-ECU configuration function to set the 

"Headlight auto cut customize" to "C-spec." (Refer to 

P.54A-183

).

STEP 2. Using scan tool MB991958, read the diagnostic 
trouble code.
(1) Turn the ignition switch to the "ON" position.
(2) Check whether the ETACS-ECU related DTC is set.
(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-582

).

NO :  Go to Step 3.

AC608435

Data link connector

MB991827

MB991824

MB991910

AB

HEADLIGHT

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STEP 3. Using scan tool MB991958, check data list.
Use the ETACS-ECU service data to check the signals related 
to the operation of headlight automatic shutdown function.

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

• Illuminate the headlights.

• Open the driver's door.

Q: Does scan tool MB991958 display the items "Head light 

LO ON duty", "IG voltage" and "Dr door ajar switch" as 
normal condition?
YES : Go to Step 4.
NO :  Troubleshoot the ETACS-ECU. Refer to ETACS, 

Diagnosis 

P.54A-639

.

STEP 4. Retest the system
Check that the headlight automatic shutdown function works 
normally.
Q: Is the check result normal?

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.

Item No.

Item name

Normal 
condition

Item 206

Head light LO ON 
duty

100%

Item 254

IG voltage

0 V

Item No.

Item name

Normal 
condition

Item 256

Dr door ajar switch

Open