Mitsubishi Evolution X. Manual - part 970

DOME LIGHT

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CHASSIS ELECTRICAL

54A-241

DIAGNOSIS

STANDARD FLOW OF DIAGNOSTIC 
TROUBLESHOOTING

M1541301500081

Refer to GROUP 00,  How to use Troubleshooting/inspection 
Service Points, Troubleshooting Contents 

P.00-7

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DIAGNOSTIC FUNCTION

M1541302100020

HOW TO CONNECT THE SCAN TOOL (M.U.T.-III)

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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)

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MB991223

a. MB991219
b. MB991220
c. MB991221
d. MB991222

Harness set

a. Check harness
b. LED harness
c. LED harness 

adapter

d. Probe

General service 
tool (jumper)

Continuity check and voltage 
measurement at harness wire or 
connector

a. For checking connector pin 

contact pressure

b. For checking power supply 

circuit

c. For checking power supply 

circuit

d. For connecting a locally sourced 

tester

MB992006
Extra fine probe

−

Continuity check and voltage 
measurement at harness wire or 
connector

Tool

Tool number and 
name

Supersession

Application

MB991223

a

d

c

b

DO NOT USE

BA

MB992006

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CHASSIS ELECTRICAL

54A-242

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. Ensure that the ignition switch is at the "LOCK" (OFF) 

position.

2. Start up the personal computer.
3. Connect special tool MB991827 to special tool MB991824 

and the personal computer.

4. Connect special tool MB991910 to special tool MB991824.
5. Connect special tool MB991910 to the data link connector.
6. Turn the power switch of special tool MB991824 to the "ON" 

position.
NOTE: When special tool MB991824 is energized, special 
tool MB991824 indicator light will be illuminated in a green 
color.

7. Start the M.U.T.-III system on the personal computer.
NOTE: Disconnecting scan tool MB991958 is the reverse of the 
connecting sequence, making sure that the ignition switch is at 
the "LOCK" (OFF) position.

HOW TO READ AND ERASE DIAGNOSTIC 
TROUBLE CODES

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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)

.

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.
NOTE: If the battery voltage is low, diagnostic trouble codes will 
not be set. Check the battery if scan tool MB991958 does not 
display.
1. Connect scan tool MB991958 to the data link connector.
2. Turn the ignition switch to the "ON" position.
3. Select "System select" from the start-up screen.
4. Select "From 2006 MY" of "Model Year." When the "Vehicle 

Information" is displayed, check the contents.

5. Select "ETACS" from "System List", and press the "OK" 

button.
NOTE: When the "Loading Option Setup" list is displayed, 
check the applicable item.

6. Select "Diagnostic Trouble Code."
7. If a DTC is set, it is shown.
8. Choose "Erase DTCs" to erase the DTC.

AC608435

Data link connector

MB991827

MB991824

MB991910

AB

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CHASSIS ELECTRICAL

54A-243

TROUBLE SYMPTOM CHART

M1541300200139

SYMPTOM PROCEDURES

Inspection Procedure 1: The front dome light does not illuminate normally.

CAUTION

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

Inspection 
Procedure No.

Trouble symptom

Reference page

1

The front dome light does not illuminate normally.

P.54A-243

2

The rear dome light does not illuminate normally.

P.54A-248

3

The luggage compartment light does not illuminate normally.

P.54A-252

4

The interior light auto-cut function does not operate correctly.

P.54A-255

Front Dome Light Circuit

ETACS-ECU

FRONT
DOME
LIGHT

DOME LIGHT

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CHASSIS ELECTRICAL

54A-244

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TROUBLE JUDGMENT

The ETACS-ECU illuminates and extinguishes the 
front room light in accordance with the input signals 
below.

• Ignition switch (IG1)

• Key reminder switch

• Door switches

• Front door lock actuator

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TECHNICAL DESCRIPTION (COMMENT)

If this does not work normally, the above switch input 
circuit(s), front dome light, or ETACS-ECU may have 
a problem.

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TROUBLESHOOTING HINTS

• Malfunction of the key reminder switch

• Malfunction of door switch

• Malfunction of the front door lock actuator switch

• Malfunction of front dome light

• 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)

STEP 1. Rear dome light operation check.
Check that the rear dome light illuminates and extinguishes 
normally.
Q: Does rear dome light work normally?

YES : Go to Step 2.
NO :  Replace the ETACS-ECU.

AC708972AI

Connector: C-316

Junction block

AC708954 AX

Connector: D-03