Mitsubishi Evolution X. Manual - part 91

SYSTEM OPERATION

TSB Revision

KEYLESS OPERATION SYSTEM (KOS)

42B-13

KEYLESS ENTRY FUNCTION

M2421000400222

.

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 keyless operation key with lock, 

unlock, trunk lid and panic buttons.

• The receiver antenna assembly incorporates a 

receiver and a receiving antenna.

• Up to four 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.42B-28

).

• Keyless entry timer lock

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

P.42B-28

).

AC708674

AC708690

AC608093

AC708642

AB

ETACS-ECU

KOS-ECU

Receiver antenna assembly

Electric signal

Lock button

Trunk lid button

Unlock button

Panic button

Keyless operation key

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.

Radio frequency signal

SYSTEM OPERATION

TSB Revision

KEYLESS OPERATION SYSTEM (KOS)

42B-14

DESCRIPTION OF CONSTRUCTION AND 
OPERATION

.

KEYLESS OPERATION KEY

• The keyless operation key is integrated into the 

master key. The four-knob button is adopted, and 
the specific encrypted code is transmitted as 
radio wave signal.

• A brilliant silver three-diamond mark is stamped 

on the back side of the key grip to improve 
appearance.

• 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, CR2032 is used in the key-

less operation key.

• Using a customization feature, the keyless opera-

tion key operation can be changed (Refer to 

P.42B-28

).

• The keyless operation key button operation 

allows the system to operate as follows:

KEYLESS OPERATION SYSTEM OPERATION TABLE (DEFAULT)

.

AC609441

AC608093

AC608094

AB

Lock button

Trunk lid button

Unlock button

Panic button

Three-diamond mark

Indicator light

<Front view>

<Rear view>

Operation of keyless operation key

System operation

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

SYSTEM OPERATION

TSB Revision

KEYLESS OPERATION SYSTEM (KOS)

42B-15

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. It sends the signal the antenna received 
from the keyless operation key to KOS-ECU. 
KOS-ECU compares this signal with the ID code reg-
istered in it, and when they coincided, a signal is out-
put from ETACS-ECU. By connecting scan tool 
MB991958 (M.U.T.-III sub-assembly) to the data link 
connector, up to four encrypted codes of keyless 
operation keys can be registered.
NOTE: IA keyless operation key can be added with-
out using the scan tool. <USA only>

.

FUNCTION FOR CONFIRMING RECEIVER 
ANTENNA ASSEMBLY OUTPUT AND 
OPERATION

When the KOS-ECU receives an electric wave signal 
of the identification code stored in the receiver 
antenna assembly, the KOS-ECU outputs 
LOCK/UNLOCK signal to the ETACS-ECU and 
informs the driver of the keyless entry system opera-
tion by flashing the light and blowing horn (Answer-
back). The initial setting at factory for the 
answerback function is as the following table. Using 
a customization feature, the answerback function 
can be changed (Refer to 

P.42B-28

).

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 (receiver antenna 
assembly)

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

KEYLESS OPERATION SYSTEM (KOS)

42B-16

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 keyless operation key 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 keyless operation key is 
input to the ETACS-ECU via receiver antenna 
assembly, all doors are locked and the dome light will 
extinguish*. When UNLOCK signal is input, all doors 
are unlocked and the dome light illuminates for 15 
seconds. The dome light fades in, keeps on, and 
fades out in 15 seconds after the door unlock relay is 
operated.
NOTE: *: If doors are locked with the keyless opera-
tion key when the dome light is ON while doors are 
opened, the dome light is switched off in 1.2 sec-
onds. In addition, if doors are locked with the keyless 
operation key when the dome light is OFF, the dome 
light does not work.

.

KEYLESS ENTRY HORN ANSWERBACK 
FUNCTION

When the LOCK signal from the keyless operation 
key is received into ETACS-ECU via receiver 
antenna assembly, all doors are locked and the horn 
sounds. If the driver's door cannot be locked even 
when the keyless operation key 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