Mitsubishi Evolution X. Manual — part 619

DIAGNOSIS

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WIRELESS CONTROL MODULE (WCM)

42C-93

Inspection Procedure 5: Keyless entry system does not work.

CAUTION

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

AC709290

JOINT
CONNECTOR (6)

RECEIVER

KEYLESS
ENTRY
TRANSMITTER

WIRELESS
CONTROL
MODULE

RECEIVER
ANTENNA
ASSEMBLY

Wireless Control Module System Input Signal

AB

RED

RED

GREEN -RED

GREEN -RED

YELLOW

-GREEN

YELLOW

-GRAY

YELLOW

-GRAY

BROWN -WHITE

BROWN -WHITE

RED- WHITE

RED- WHITE

RED

GREEN -RED

BROWN -WHITE

RED- WHITE

AC708951AY

Connectors: C-07, C-16

C-16 (B)

C-07

AC708950BA

Connector: C-41

DIAGNOSIS

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WIRELESS CONTROL MODULE (WCM)

42C-94

.

TECHNICAL DESCRIPTION (COMMENT)

The receiver antenna assembly receives the
lock/unlock signals from the transmitter, and sends
them to the WCM, and further to the ETACS-ECU.
Then, the ETACS-ECU receives the signals of the
key reminder switch and all door switches, then acti-
vates the keyless entry system.

.

TROUBLESHOOTING HINTS

• The CAN bus line may be defective

• The key reminder switch may be defective

• The door switches may be defective

• The keyless entry transmitter may be defective

• The receiver antenna assembly may be defective

• The WCM may be defective

• The ETACS-ECU may be defective

• The wiring harness or connectors may have

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

• Option coding information

DIAGNOSIS

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

AC708955AM

Connector: D-14

DIAGNOSIS

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WIRELESS CONTROL MODULE (WCM)

42C-95

STEP 1. Using scan tool MB991958, check for CAN bus 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.42C-6

."

(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 2.
NO : Repair the CAN bus line (Refer to GROUP 54C,

Diagnosis

P.54C-14

).

AC608435

Data link connector

MB991827

MB991824

MB991910

AB

DIAGNOSIS

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WIRELESS CONTROL MODULE (WCM)

42C-96

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.42C-6

."

(2) Turn the ignition switch to the "ON" position.
(3) Check whether the WCM related DTC is set.
(4) Turn the ignition switch to the "LOCK" (OFF) position.
Q: Is the DTC set?

YES : Diagnose the WCM. Refer to Diagnostic trouble code

chart

P.42C-14

.

NO : Go to Step 3.

STEP 3. Check the power supply system
With the ignition switch in the LOCK (OFF) position, check if
the following function operates normally:

• Headlights

• Hazard warning light

Q: Is the check result normal?

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

− Malfunction of ETACS-ECU

power supply circuit

P.54A-636

.

STEP 4. Verify the central door locking system.
Check that the central door locking system works normally.
Q: Is the check result normal?

YES : Go to Step 5.
NO : Refer to GROUP 42A

− Troubleshooting

P.42A-30

.

AC608435

Data link connector

MB991827

MB991824

MB991910

AB