Mitsubishi Evolution X. Manual - part 96

GENERAL INFORMATION

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WIRELESS CONTROL MODULE (WCM)

42C-3

Main components and functions

NOTE: 

.

•

*

: Illuminates for tire pressure warning.

•

*

: Flashes for about 1 minute and then continuously illuminated for TPMS malfunction warning.

.

Parts name

Functional description

WCM

Controls the keyless entry functions, TPMS functions and starting of the engine 
by using the following communications.

• Communications with ETACS-ECU, ECM, ASC-ECU and combination meter 

via CAN

• Wireless communication with the ignition key (transponder)

• Wireless communication with the ignition key (transmitter) via the receiver 

antenna assembly

Receiver antenna 
assembly

Receives the operation signals from the lock/unlock buttons, trunk lid button, 
and panic button on the ignition key (transmitter) as well as the tire pressure 
signal from the TPMS transmitter. Then, transmits them to WCM.

Ignition key

The ignition key (transponder) receives signals sent from WCM, certifies the 
key ID code, calculates the key ID, and sends the reply data signal to WCM. 
The ignition key (transmitter) also sends signals to receiver antenna assembly 
when the lock/unlock/trunk lid button and the panic button on it are operated.

Combination meter (Multi 
information display, TPMS 
warning light)

Communicates with WCM via CAN. Send ignition switch status. Receives the 
warning request or warning information about TPMS from WCM, activates

*

 the 

TPMS warning light. Warning symbol and message is additionally displayed on 
the multi information display.

ETACS-ECU

Communicates with WCM via CAN. By the door lock/unlock request, trunk open 
request, or panic alarm request from WCM, ETACS-ECU outputs the 
lock/unlock signal, trunk open signal, or panic alarm signal. When the door 
lock/unlock signal is output, ETACS-ECU flashes or illuminates the turn signal 
light and dome light to notify that the lock/unlock operation is performed.

ASC-ECU

Communicates with WCM via CAN. Sends the vehicle speed data.

ECM

Communication with WCM via CAN. Send atmospheric pressure data..

TPMS transmitter

Measure tire pressure directly, then send radio frequency signal to receiver 
antenna assembly.

GENERAL INFORMATION

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WIRELESS CONTROL MODULE (WCM)

42C-4

System configuration

NOTE: In case of replacement of WCM, all keyless 
ID, key ID and tire pressure sensor ID should be 
re-registered using scan tool MB991958 (M.U.T.-III 
sub-assembly).

AC709230

Door lock actuator

ETACS-ECU

Turn-signal light

Wireless control module
(WCM)

ECM

Combination meter 
(Multi information display,
TPMS warning light)

Lock button

Unlock button

Indicator light

CAN-B 
communi-
cation

CAN-C comm-
unication

AB

Trunk lid latch

Ignition key

Radio
frequency
signal 
(transponder)

Front tire (LH)

Front tire (RH)

Rear tire (LH)

Rear tire (RH)

TPMS transmitter

CPU

Transmission 
circuit

Antenna

Pressure 
sensor

Acc.
sensor

Battery

ASC-ECU

Dome light,
Ignition key cylinder
illumination light

Horn

Panic button

Trunk lid button

Radio
frequency
signal
(transmitter)

Reciever antenna
assembly

Radio
frequency
signal (transmittter)

Head light,
Tail light

SYSTEM OPERATION

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WIRELESS CONTROL MODULE (WCM)

42C-5

SYSTEM OPERATION

KEYLESS ENTRY FUNCTION

M2422000400195

.

This keyless entry function has the following fea-
tures: A keyless entry system enables locking and 
unlocking of all doors, the trunk lid from 12m (39.4 
feet) away from the vehicle. The following features 
are also available.

• A four-knob type transmitter with lock, unlock, 

trunk lid and panic buttons.

• The receiver antenna assembly incorporates a 

receiver and a receiving antenna.

• Up to eight key ID can be registered using scan 

tool MB991958 (M.U.T.-III sub-assembly).

• Answerback functions

NOTE: The answerback function can be changed 
using a customization function (Refer to 

P.42C-14

).

• Keyless entry timer lock

NOTE: Timer of the keyless entry timer lock can 
be changed using a customization function (Refer 
to 

P.42C-14

).

AC709257

AC708689

AC405616

PANIC

AC708642

AB

ETACS-ECU

WCM

Transmitter

Electric signal

Radio frequency signal

Lock button

Unlock button

Panic button

Trunk lid button

Receiver antenna assembly

Door lock actuators (lock/unlock)
Trunk lid latch assembly
The signal causes the hazard warning light to flash once 
when the doors are locked, or flash twice when unlocked (Default).
The signal causes the dome light to extinguish when 
the doors are locked, or come on for 15 seconds when unlocked.

SYSTEM OPERATION

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WIRELESS CONTROL MODULE (WCM)

42C-6

DESCRIPTION OF CONSTRUCTION AND 
OPERATION

.

TRANSMITTER

• The transmitter is integrated into the master key. 

The four-knob button is adopted, and the specific 
encrypted code is transmitted as radio wave sig-
nal.

• An indicator light, which illuminates when signals 

are sent, is added on the key grip. This indicator 
light informs you of the signal transmission status 
and warns you of flat battery.

• A signal transmission circuit (printed circuit) and 

a battery are housed in one case. The case is 
housed in the key grip, thus improving resistance 
to water ingress.

• A coin type battery, CR1620 is used in the trans-

mitter.

• The functions of the immobilizer system are inte-

grated (Refer to 

P.42C-9

).

• Using a customization feature, the transmitter 

button operation can be changed (Refer to 

P.42B-28

).

• The transmitter button operation allows the sys-

tem to operate as follows:

KEYLESS ENTRY FUNCTION OPERATION TABLE (DEFAULT)

.

PANIC

AC405616

AC405617

AC405710

Lock button

Unlock button

Panic button

<Front view >

<Back view>

Trunk lid button

AF

Three-diamond mark

Indicator light

Operation of transmitter

Operation of keyless entry function

Lock button

Press once

Lock all doors

Unlock button

Press once

Unlock the driver’s door

Press twice

Unlock all doors

Trunk lid button

Press twice (press once, 
and then press again within 
5 seconds)

Open the trunk lid

Panic alarm 
system

Panic button

Press once (press and hold 
for 1 second).

Starts the panic alarm (headlights flash and 
horn honks for three minutes)

Lock button, 
unlock button, 
trunk lid button 
or panic button

Press again

Stops the panic alarm in progress