Mitsubishi Outlander GS45X. Manual - part 1106

GENERAL INFORMATION

TSB Revision

KEYLESS OPERATION SYSTEM (KOS)

42B-3

CONSTRUCTION DIAGRAM

ACA02748

AC506891

AC611960

AC505247

Engine control module

Antenna and Outer tone alarm assembly
<Exterior transmitter 
antenna assembly (Liftgate), 
Outer tone alarm>

KOS-ECU

AB

Lock/unlock switch

(Driver's side door, Passenger's side door)

Lock/unlock switch

Lock/unlock switch 
(Front passenger's side door)

Exterior transmitter 
antenna assembly 
(Front passenger's side)

Interior transmitter
antenna assembly (Rear: RH)

Interior transmitter 
antenna assembly 
(Front)

TPMS transmitter 
(Tire pressure sensor)

TPMS transmitter 
(Tire pressure sensor)

TPMS transmitter 
(Tire pressure sensor)

TPMS transmitter 
(Tire pressure sensor)

ABS-ECU or 
ASC-ECU

Exterior transmitter 
antenna assembly 
(Driver's side)

 

Lock/unlock switch 
(Driver's side door)

ETACS-ECU

Steering lock 
(Push switch, 
Steering lock unit)

IG knob cap

IG knob

Receiver
antenna module

Ignition switch

Front of vehicle

Lock switch

Liftgate lock release handle

GENERAL INFORMATION

TSB Revision

KEYLESS OPERATION SYSTEM (KOS)

42B-4

.

AC901509

LOW
  TIRE PRESSURE

LOW  TIRE  PRESSURE

AB

Multi-information display 
(built in combination meter)

TPMS 
warning light

<Vehicles without color 
liquid crystal display>

<Vehicles with color 
liquid crystal display>

TPMS 
warning light

Multi-information display 
(built in combination meter)

AC709981AB

Emergency key

Emergency key

Keyless operation key

Emergency key

Lock button

Unlock button

Indicator light

Panic button

GENERAL INFORMATION

TSB Revision

KEYLESS OPERATION SYSTEM (KOS)

42B-5

Main components and functions

Parts name

Functional description

KOS-ECU

Controls KOS by using the following inputs/outputs and 
communications.

• Input from the lock/unlock switch on each door, input from 

the push switch on the IG knob

• Communications with ETACS-ECU, ECM, ABS or ASC-ECU 

and combination meter via CAN

• Wire communication with the steering lock unit

• Wireless communication with the keyless operation key via 

the receiver antenna module and interior/exterior transmitter 
antennas

• Wireless communication with the TPMS transmitter

• Output to the outer tone alarm

Steering lock (incorporates push switch 
and steering lock unit)

The steering lock has two unlocking mechanisms; a mechanical 
mechanism that uses an emergency key and an electrical 
mechanism. In the electrical unlocking mechanism, the steering 
lock communicates with KOS-ECU via wire, and when 
requested by KOS-ECU, the steering lock unlocks for two 
seconds.

Keyless operation key (incorporates 
emergency key)

• The keyless operation key receives signals sent from each 

interior/exterior transmitter antenna, certifies the keyless 
operation key ID code, calculates the encrypted code, and 
sends the reply data signal to KOS-ECU via the receiver 
antenna module. When the lock/unlock switch on the 
keyless operation key is pressed, corresponding signal is 
sent to KOS-ECU via the receiver antenna module.

• If two or more keyless operation keys registered in 

KOS-ECU respond at the same time, their signals would 
interfere. To avoid this interference, each signal from 
KOS-ECU is given the priority

*1

 data, and the keyless 

operation keys respond in accordance with this priority.

Lock/unlock switch

Driver's door

• Locks all the doors when a driver carrying the keyless 

operation key presses the lock/unlock switch on the front 
door outside handle . 

• The lock/unlock switch on the driver’s front door outside 

handles unlock driver’s the door when a driver carrying the 
keyless operation key pulls the driver’s door outside handle. 

Front passenger's 
door

Liftgate lock release handle

Locks all the doors and the liftgate when a driver carrying the 
keyless operation key presses the lock switch on the front door 
outside handle or on the liftgate lock release handle.

Lock switch

Liftgate

Locks all the doors and the liftgate when a driver carrying the 
keyless operation key presses the lock switch on the front door 
outside handle or on the liftgate lock release handle. 

Exterior transmitter 
antenna assembly

Driver's side

Converts the data output from KOS-ECU via wire into a signal, 
and sends it to the keyless operation key.

Front passenger's 
side

Interior transmitter 
antenna assembly

Front

Converts the data output from KOS-ECU via wire into a signal, 
and sends it to the keyless operation key.

Rear: RH

GENERAL INFORMATION

TSB Revision

KEYLESS OPERATION SYSTEM (KOS)

42B-6

NOTE: 

*1

: When registering the keyless operation 

keys, KOS-ECU numbers each key (1 to 4) in the 
order they are registered (initial priority). This priority 
is renewed each time the doors are locked/unlocked 
and the IG knob is pressed. For example, when only 
keys 1 and 3 have responded to the signal sent from 

KOS-ECU, the new priority of the keys would be 
1-3-2-4. When keys 3 and 4 have responded, then 
the priority of the keys becomes 3-4-1-2.
NOTE: 

*2

: Illuminates for tire pressure warning. 

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

Antenna & tone 
alarm assembly

Exterior transmitter 
antenna assembly 
(liftgate)

Converts the data output from KOS-ECU via wire into a signal, 
and sends it to the keyless operation key.

Outer tone alarm

The outer tone alarm sounds when:

• The doors are locked or unlocked by the door entry function.

• The keyless operation key is brought out of the vehicle when 

the IG knob is in the "LOCK" (OFF) position and the push 
switch is in other than the ON position.

• The lock/unlock switch of the front door outside handle is 

pressed when the IG knob is in the "LOCK" (OFF) position 
and the push switch is in other than the ON position.

• The lock button on the keyless operation key is pressed from 

inside the car.

• The lock button on the keyless operation key is pressed 

when the door is ajar.

• The lock/unlock switch of the front door outside handle is 

pressed when the keyless operation key is inside the 
vehicle.

• The lock/unlock switch of the front door outside handle is 

pressed when the door is not properly closed.

Receiver antenna module

Receives the operation signals from the lock/unlock buttons 
and panic button on the keyless operation key as well as the 
tire pressure signal from the TPMS transmitter and keyless 
operation key ID data which is necessary for engine start. Then, 
sends the data to KOS-ECU. Receives the keyless operation 
key ID data which is necessary for the engine start using the 
emergency key, and then sends the data to KOS-ECU.

TPMS transmitter

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

Combination meter (Multi information 
display, TPMS warning light)

Communicates with KOS-ECU via CAN. Receives the warning 
request or warning information from KOS-ECU, activates

*2

 the 

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

ETACS-ECU

Communicates with KOS-ECU via CAN. By the door 
lock/unlock request or panic alarm request from KOS-ECU, 
ETACS-ECU outputs the lock/unlock 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.

ECM

Communicates with KOS-ECU via CAN. Permits/inhibits the 
engine starting and controls the engine operation. Send 
atmospheric pressure data.

ABS or ASC-ECU

Communicates with KOS-ECU via CAN. Sends the vehicle 
speed data.

Parts name

Functional description