Mitsubishi Evolution X. Manual — part 97

SYSTEM OPERATION

TSB Revision

WIRELESS CONTROL MODULE (WCM)

42C-7

ENCRYPTED CODE

Four data codes are transmitted when a switch is
operated once. The encrypted code for user identifi-
cation is a combination of 0 and 1, and more than 1
million different combinations are available. To pre-
vent theft by copying signal codes, the data code
includes a rolling code with the encrypted code. The
rolling code changes each time a signal is sent.

.

RECEIVER

The receiver is incorporated into the receiver
antenna assembly together with the receiving
antenna. The receiver outputs the signal which the
antenna received from transmitter to WCM, and
WCM compares it with the registered encrypted
code. Only when the signal and the code match, a
signal is output from WCM to ETACS-ECU. By con-
necting the scan tool MB991958 (M.U.T.-III
sub-assembly) to the data link connector, encrypted
codes of up to eight transmitters can be registered.
NOTE: IA transmitter can be added without using the
scan tool. <USA only>

.

FUNCTION FOR CONFIRMING RECEIVER
ANTENNA ASSEMBLY OUTPUT AND
OPERATION

When WCM receives an electric wave signal of the
identification code (lock/unlock signal) stored in
WCM, WCM outputs the lock/unlock signal to
ETACS-ECU. When the lock/unlock signal is input,
ETACS-ECU outputs the lock/unlock signal and, at
the same time, notifies using the light and horn that
the keyless entry is operated (answerback). The ini-
tial setting at factory for the answerback function is
as following table. Using a customization feature, the
answerback function can be changed (Refer to

P.42C-14

).

FUNCTION TABLE FOR CONFIRMING KEYLESS ENTRY OPERATION (DEFAULT)

.

AC508281AB

ON

OFF

Transmitter lock or unlock button

Data
code

Item

Operation
Doors locked

Doors unlocked

ETACS-ECU (WCM)

Sends lock signal

Sends unlock signal

Dome light

Flashes once

Illuminates for 15 seconds

Turn-signal lights (RH and LH) Flashes once

Flashes twice

Horn

Sounds once if doors are already
locked

−

SYSTEM OPERATION

TSB Revision

WIRELESS CONTROL MODULE (WCM)

42C-8

KEYLESS ENTRY HAZARD LIGHT
ANSWERBACK FUNCTION

The hazard answerback function that allows check-
ing the lock/unlock state of the door easily even in
the daytime is installed. When the LOCK signal from
the transmitter is input to ETACS-ECU, all doors are
locked and the hazard warning light flashes once.
When UNLOCK signal is input, all doors are
unlocked and the hazard warning light flashes twice.

.

KEYLESS ENTRY DOME LIGHT ANSWERBACK FUNCTION

When LOCK signal from the transmitter is input from
WCM to ETACS-ECU, all doors are locked, and the
dome light is turned off in synchronization with the
hazard light answerback (when the dome light is illu-
minated, the light extinguishes). Also, when
UNLOCK signal from the transmitter is input from
WCM to ETACS-ECU, all doors are unlocked, and
the dome light illuminates for 15 seconds in synchro-
nization with the hazard light answerback.
NOTE: *: If doors are locked with the transmitter
when the dome light is ON while doors are opened,
the dome light is switched off in 1.2 seconds. In addi-
tion, if doors are locked with the transmitter when the
dome light is OFF, the dome light does not work.

.

KEYLESS ENTRY HORN ANSWERBACK
FUNCTION

When WCM receives the LOCK signal from the
transmitter and send LOCK signal to ETACS-ECU,
all doors are locked and the horn sounds. If the
driver's door cannot be locked even when the key-
less entry transmitter is operated, the horn does not
sound.

.

AC207001AB

ON

OFF

OFF

ON

OFF

LOCK

UNLOCK

Illuminate

Extinguish

Keyless entry
transmitter
switch

Lock relay output

Unlock relay output

Hazard
warning light

AC404883AB

c

b

b

a

a: 0.6 second
b: 1.2 seconds
c: 15 seconds

OFF

ON

ON

OFF

Illuminate

Extinguish

Lock relay output

OFF

ON

Door unlock switch

output

OFF

ON

Door lock switch

output

Unlock relay output

Dome light

SYSTEM OPERATION

TSB Revision

WIRELESS CONTROL MODULE (WCM)

42C-9

KEYLESS ENTRY TIMER LOCK TIME

When none of the doors is opened within 30 seconds
after the doors are unlocked by the keyless entry
system, ETACS-ECU automatically outputs the door
lock signal to lock the doors. This function prevents
the doors from being unlocked unexpectedly by
operation errors. Using a customization function, the
timer lock time can be changed (Refer to

P.42C-14

).

.

OPERATION INHIBITION CONDITIONS

The operation of the system is inhibited when:

• The ignition key is in the ignition switch.

• Any door is open (door switch is ON). (including

door ajar)

THEFT-ALARM SYSTEM

Refer to GROUP 54A, Theft-alarm system

P.54A-44

.

IMMOBILIZER FUNCTION

M2422000500170

The immobilizer function prevents the engine from
starting and immobilizes the vehicle if a key other
than the key registered for that vehicle is used in an
attempt to start the engine after forced entry.

CONSTRUCTION DIAGRAM

OPERATION

1. With the ignition key turned ON, the transponder

(a small transmitter) integrated in the ignition key
transmits its own ID code (key ID) to WCM via
radio wave.

2. According to the sent key ID, WCM controls the

ECM only when the sent ID code agrees with the
pre-registered one.

3. The system is designed to be maintenance-free

because the power source for the transponder is
supplied by WCM. Two ignition keys are pro-
vided, and up to eight ignition keys can be regis-
tered to one vehicle as needed. More than one
trillion of ID code combinations can be registered,
and parts of them are irregularly changed when-
ever the ignition key is turned ON. This feature
prevents code copying, resulting in higher secu-
rity of the system.

NOTE: In case of replacement of WCM, or loss or
addition of the ignition key, all key ID codes should
be re-registered using scan tool. (A key can be
added without using the scan tool. <USA only>)

CAUTION

Do not register the key that has already been reg-
istered for other vehicle.

AC708438

Transponder

Ignition key

WCM

ETACS-ECU

ECM

Ignition

Injection

CPU

CAN

CAN-B

CAN-C

CAN

CPU

AC

Steering lock

Key ID

Starter
relay

SYSTEM OPERATION

TSB Revision

WIRELESS CONTROL MODULE (WCM)

42C-10

TIRE PRESSURE MONITORING SYSTEM (TPMS) FUNCTION

M2422000800029

When the tire pressure becomes under the specified
value, the TPMS function warns the driver of that
state by illuminating the TPMS warning light.

OPERATION

• The signals from the TPMS transmitter are

received by the receiver antenna assembly and
sent to WCM.

• WCM processes input signals from each TPMS

transmitter as well as vehicle speed signals from
the ABS-ECU if equipped. It receives the atmo-
spheric pressure signal from ECM, and when the
atmospheric pressure is low (such as at high alti-
tude), it calibrates the tire pressure received from
TPMS transmitter and makes a judgment of
warning. When the road tire pressure is low, it
sends a warning signal causing the TPMS warn-
ing light to be illuminated. When the TPMS has
problems, it sends a warning signal causing the
TPMS warning light to be flashed

*

.

NOTE:

*

: Change to continuous illumination after

flashing for about 1 minute.

• For 3 seconds after the ignition switch is turned to

the "ON" position, WCM illuminates the TPMS
warning light to check any breaks in the TPMS
warning light circuit.

• By connecting the scan tool to the data link con-

nector, data stored in WCM (data of tire pressure
and TPMS transmitter ID, the alarm status and
warning history, etc.) can be displayed and TPMS
transmitter ID can be registered.
NOTE: If the TPMS transmitter is replaced, regis-
ter the ID codes of all the TPMS transmitters
again using the scan tool.

TPMS WARNING LIGHT

The TPMS warning light on the combination meter illuminates
or flashes

*

to alert the driver by request from WCM. When the

tire pressure warning or the fault warning is activated, a warn-
ing symbol and a message are displayed on the multi informa-
tion display.
WARNING DISPLAY PATTERN OF TPMS WARNING LIGHT
AND MULTI INFORMATION DISPLAY

NOTE:

*

:Change to continuous illumination after flashing about

1 minute.

Circumstance

Warning light Multi

information
display

For 3 seconds
after the ignition
switch is turned to
the "ON" position
(warning light
circuit self-check)

Illuminates

No indication

TPMS problems

Flashes

*

Symbol and
"SERVICE
REQUIRED" is
displayed

Low tire pressure Illuminates

Symbol and
"LOW TIRE
PRESSURE"
is displayed

LOW
TIRE PRESSURE

SERVICE
REQUIRED

AC609362