Mitsubishi Evolution X. Manual - part 482

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SYMPTOM PROCEDURES <CENTRAL DOOR LOCKING SYSTEM>

INSPECTION PROCEDURE 1: Central Door Locking System does not work at All.

CAUTION

Before replacing the ECU, ensure that the power 
supply circuit, the ground circuit and the com-
munication circuit are normal.

AC709019

ETACS-ECU

LINK

37

DOOR

LOCK

RELAY

DRIVER'S

DOOR

UNLOCK

RELAY

PASSENGER'S

DOOR

UNLOCK

RELAY

RED

RED

FRONT DOOR LOCK ACTUATOR OR

REAR DOOR LOCK ACTUATOR

AB

POWER 
WINDOW 
MAIN 
SWITCH

JOINT
CONNECTOR 
(3)

JOINT
CONNECTOR 
(1)

DOOR 
LOCK 
SWITCH

DOOR 
LOCK 
SWITCH

BLACK

BLACK

BLACK

BLACK

YELLOW

YELLOW -RED

GRAY

GRAY

YELLOW -RED

YELLOW -RED

YELLOW -RED

GRAY

GRAY

GRAY

FRONT 
POWER 
WINDOW 
SUB SWITCH

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.

CIRCUIT OPERATION

• The ETACS-ECU controls the central door lock 

system, locking or unlocking all the doors by acti-
vating the central door lock relay (built into the 
ETACS-ECU). The ETACS-ECU uses inputs from 
the following components:

• Door lock actuator

• Door lock switch, which is incorporated in the 

power window main switch or power window 
sub switch

.

TROUBLESHOOTING HINTS

• The wiring harness or connectors may have 

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

• The ETACS-ECU may be defective

DIAGNOSTIC PROCEDURE

Required Special Tools:

• MB992006: Extra fine probe

• MB991223: Harness set

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

• MB991824: Vehicles Communication Interface (V.C.I.)

• MB991827 M.U.T.-III USB Cable

• MB991910 M.U.T.-III Main Harness A

STEP 1. Checking keyless entry system operation
Check that the keyless entry system works normally.
Q: Is the check result normal?

YES : Go to Step 2.
NO <Vehicles with KOS> : Refer to GROUP 42B, 

Inspection procedure 14 "Keyless entry system does 
not work at all 

P.42B-234

."

NO <Vehicles with WCM> : Refer to GROUP 42C, 

Inspection procedure 5 "Keyless entry system does 
not work at all 

P.42C-93

."

AC708950AH

Connectors: C-101, C-103

C-103 (B)

C-101 (B)

AC708972AK

Connectors: C-301, C-315

ETACS-ECU

C-301

C-315

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STEP 2. 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 tool (M.U.T.-III) 

P.42B-10

."

(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 GROUP 54A, 

Diagnostic trouble code chart 

P.54A-582

.

NO :  Go to Step 3.

AC608435

Data link connector

MB991827

MB991824

MB991910

AB

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STEP 3. Using scan tool MB991958, check data list.
Check the signals related to the central door locking system 
operation.

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.42B-10

."

(2) Turn the ignition switch to the "ON" position.
(3) Check the data list of the ETACS.

• Turn the door lock switch (power window main switch or 

front power window sub switch) to the lock direction.

• Turn the door lock switch (power window main switch or 

front power window sub switch) to the unlock direction.

(4) Turn the ignition switch to the "LOCK" (OFF) position.

OK: Normal conditions are displayed for all items.

Q: Are the check result normal?

YES : Go to Step 4.
NO :  Refer to GROUP 54A 

− Inspection procedure 4 "The 

front door lock actuator (driver’s side) signal is not 
received 

P.54A-647

."

STEP 4. Check joint connector (1) connector C-101, joint 
connector (3) connector C-103, ETACS-ECU connector 
C-301 and C-315 for loose, corroded or damaged 
terminals, or terminals pushed back in the connector.
Q: Are joint connector (1) connector C-101, joint connector 

(3) connector C-103, ETACS-ECU connector C-301 and 
C-315 in good condition?
YES : Go to Step 5.
NO :  Repair or replace the damaged component(s). Refer 

to GROUP 00E, Harness Connector Inspection 

P.00E-2

. Check that the sunroof works normally.

Item No.

Item name

Normal 
condition

270

Dr door lock switch

Lock

271

Dr door unlock 
switch

Not unlock

Item No.

Item name

Normal 
condition

270

Dr door lock switch

Not lock

271

Dr door unlock 
switch

Unlock

AC608435

Data link connector

MB991827

MB991824

MB991910

AB