Mitsubishi Evolution X. Manual - part 527

DIAGNOSIS

TSB Revision

KEYLESS OPERATION SYSTEM (KOS)

42B-15

Registration flow chart

AC709282

3. KOS ID is registered
to steering lock unit.

3. Automatic registration
of KOS ID.

4. Registration of VIN.

YES

NO

YES

YES

YES

NO

NO

NO

AB

Start of registration.

End of registration.

ECM is replaced.

1. Registration of ENG key code.

Steering lock unit

is replaced.

Keyless

operation key is

replaced or added

(or lost).

6. Registration of keyless
operation key ID.

KOS-ECU
is replaced.

7. Registration of tire
pressure sensor ID*.

YES

NO

TPMS transmitter

is replaced.

NOTE
*: When KOS-ECU or TPMS transmitter is replaced.

Caution:
Do not replace the ECM and the KOS-ECU simultaneously.
Always replace the ECU by ones when the multiple ECU is
replaced and then replace the next ECU after registering
the necessary IDs.

5. Registration of
key ID (every one code).

KOS-ECU is 

replaced.

YES

NO

2. Registration of VIN.

DIAGNOSIS

TSB Revision

KEYLESS OPERATION SYSTEM (KOS)

42B-16

WARNINGS/ALARMS

M1429612300117

If the KOS failed, operated improperly,  KOS-ECU 
warns the driver of this by setting off the outer tone 
alarm and the keyless operation warning indicator, 
on the multi information display in the combination 
meter. If the TPMS fails or the tire pressure is low, 
KOS-ECU warns the driver of that state by the TPMS 
warning light and the multi information display in the 
combination meter.

Display 
contents

Item

State

Warning operations

Warning 
cancellation 
conditions 
(Cancels warning 
operations when 
one of the 
conditions met)

TPMS 
warning 
light

Multi 
information 
display

Low keyless 
operation key 
battery voltage 
warning

The keyless 
operation key 
with low battery 
voltage is 
detected when 
the IG knob is 
pressed.

−

• Warning 

indicator 
flashes for 
30 seconds.

• The outer 

tone alarm 
will not 
sound.

• IG knob in 

"LOCK" (OFF) 
position and 
push switch OFF 
are detected.

• 30 seconds have 

passed after the 
warning output 
started.

No keyless 
operation key 
detected inside the 
car

No keyless 
operation key is 
detected inside 
the car when the 
IG knob is 
pressed.

−

• The warning 

indicator 
flashes for 5 
minutes.

• The outer 

tone alarm 
will not 
sound.

• IG knob in 

"LOCK" (OFF) 
position and 
push switch OFF 
are detected.

• 5 minutes have 

passed after the 
warning output 
started.

IG knob is not 
returned properly.

Opening of the 
driver's door is 
detected when 
the IG knob is in 
ACC or LOCK 
position and the 
push switch is 
ON.

−

• The warning 

indicator 
flashes for 5 
minutes.

• The outer 

tone alarm 
will not 
sound.

• Key 

reminder 
warning tone 
alarm 
sounds until 
closing of the 
driver's door 
is detected.

• The IG knob in 

the "RUN" or 
"START" 
position, or the 
IG knob in the 
"LOCK" (OFF) 
position, and the 
push switch OFF 
are detected.

• The driver's door 

is detected 
closed from the 
open position.

• 5 minutes have 

passed after the 
warning output 
started.

AC610126

KEY BATTERY 
                        LOW

AB

AC610127

KEY MISSING

AB

AC610124AB

STEERING
     WHEEL LOCK

DIAGNOSIS

TSB Revision

KEYLESS OPERATION SYSTEM (KOS)

42B-17

Keyless operation 
key brought out of 
the car warning

The keyless 
operation key is 
carried out of the 
vehicle when the 
IG knob is in the 
position other 
than the LOCK 
position, and all 
the doors are 
closed.

−

• The warning 

indicator 
flashes for 5 
minutes.

• Outer tone 

alarm 
sounds for 
5.69 
seconds in 
pattern 2.

• IG knob in 

"LOCK" (OFF) 
position and 
push switch OFF 
are detected.

• KOS-ECU has 

detected a 
keyless 
operation key 
inside the 
vehicle.

• 5 minutes have 

passed after the 
warning output 
started.

Door lock does not 
operate.

Push switch is 
pressed ON 
when the IG knob 
is in other than 
LOCK position.

−

• Warning 

indicator 
flashes for 5 
seconds.

• Outer tone 

alarm 
sounds for 
2.96 
seconds in 
pattern 1.

• IG knob in 

"LOCK" (OFF) 
position and 
push switch OFF 
are detected.

• 5 seconds have 

passed after the 
warning output 
started.

Push switch is 
pressed ON 
when the keyless 
operation key is 
inside the car.

• Lock switch on 

the keyless 
operation switch 
is pressed again.

• 5 seconds have 

passed after the 
warning output 
started.

Push switch is 
pressed ON 
when the door is 
ajar.

• All doors are 

closed.

• 5 seconds have 

passed after the 
warning output 
started.

Display 
contents

Item

State

Warning operations

Warning 
cancellation 
conditions 
(Cancels warning 
operations when 
one of the 
conditions met)

TPMS 
warning 
light

Multi 
information 
display

AC610128

CONFIRM
    KEY LOCATION

AC

AC610129

CHECK DOORS

AB

DIAGNOSIS

TSB Revision

KEYLESS OPERATION SYSTEM (KOS)

42B-18

System error

Push switch is 
pressed ON from 
OFF when an 
error has been 
detected in 
EEPROM in 
KOS-ECU.

−

• The warning 

indicator 
flashes for 5 
minutes.

• The outer 

tone alarm 
will not 
sound.

5 minutes have 
passed after the 
push switch was 
pressed ON and IG 
knob is in "LOCK" 
(OFF) position.

Push switch is 
pressed ON from 
OFF while open 
circuit in the 
transmitter 
antennas are 
being detected.
The push switch 
is pressed ON 
from OFF while 
short circuit in the 
power supply 
output (steering 
lock, transmitter 
antennas, 
receiver antenna 
module, etc.) is 
detected.
Steering lock 
communication 
error has been 
detected when 
the push switch 
was pressed ON.
The IG knob is in 
other than the 
LOCK position 
while some error 
is being detected.

Not displayed

TPMS warning light 
bulb open circuit 
check

The ignition 
switch is turned 
from "LOCK" 
(OFF) to "ON."

Illuminate
s for 3 
seconds.

−

3 seconds have 
passed after the 
TPMS warning light 
is lit.

Tire pressure alarm The received tire 

pressure value is 
under the alarm 
ON threshold 
value.

Illuminate
s.

Symbol and 
"LOW TIRE 
PRESSURE" is 
displayed.

The received tire 
pressure value is 
over the alarm OFF 
threshold value.

Display 
contents

Item

State

Warning operations

Warning 
cancellation 
conditions 
(Cancels warning 
operations when 
one of the 
conditions met)

TPMS 
warning 
light

Multi 
information 
display

AC610118

REMOVE KEY

AB

AC610119

a

AB

LOW 
  TIRE PRESSURE