Mitsubishi Outlander (2013+). Manual - part 543

TROUBLESHOOTING <KOS-ECU>

KEYLESS OPERATION SYSTEM (KOS)

42B-33

NOTE: 

*

 shows that it is displayed but not used.

ACTUATOR TEST TABLE

M1429605100081

Item No.

Check item

Driven component

1

Outer buzzer

Forces to sound the outer buzzer.

TROUBLE SYMPTOM CHART

M1429604501056

3

Driver’s door 
lock/unlock SW

Driver’s door lock/unlock switch: ON

ON

Driver’s door lock/unlock switch: OFF

OFF

5

Passenger’s door 
lock/unlock SW

Passenger’s door lock/unlock switch: 
ON

ON

Passenger’s door lock/unlock switch: 
OFF

OFF

7

Tail gate lock SW

Tailgate lock release handle lock switch: 
ON

ON

Tailgate lock release handle lock switch: 
OFF

OFF

8

Tail gate unlock SW

Tailgate lock release handle (open 
switch): ON

ON

Tailgate lock release handle (open 
switch): OFF

OFF

14

Memorized KOS keys

−

Number of the keyless 
operation keys 
memorised

15*

Memorized emergency 
KOS keys

−

Number of the 
emergency keys 
memorised

Item No.

Check item

Check condition

Normal condition

Trouble symptom

Inspection 
procedure 
number

Reference 
page

Cannot communicate with KOS-ECU using the M.U.T.-III.

1

P.42B-34

The keyless operation key cannot be registered using the M.U.T.-III.

2

P.42B-34

Abnormality in KOS-ECU power supply and earth circuits.

3

P.42B-35

Keyless operation warning display does not disappear. 

4

P.42B-36

No door will be locked or unlocked by operating a lock/unlock switch on any door. 5

P.42B-37

Driver's door lock/unlock switch does not work.

6

P.42B-38

Front passenger's door lock/unlock switch does not work.

7

P.42B-38

The lock switch and open switch of the tailgate lock release handle do not work.

8

P.42B-39

The lock switch of the tailgate lock release handle does not perform the locking 
operation.

9

P.42B-40

The open switch of the tailgate lock release handle does not perform the 
unlocking operation.

10

P.42B-41

Keyless entry function does not work.

11

P.42B-42

KOS timer lock function does not work.

12

P.42B-43

TROUBLESHOOTING <KOS-ECU>

KEYLESS OPERATION SYSTEM (KOS)

42B-34

SYMPTOM PROCEDURES

Inspection Procedure 1: Cannot communicate with KOS-ECU using the M.U.T.-III.

CAUTION

When replacing the ECU, always check that the 
communication circuit is normal.

COMMENTS ON TROUBLE SYMPTOM

KOS-ECU is communicating with M.U.T.-III via CAN. 
Therefore, communication error of KOS-ECU is sus-
pected.

PROBABLE CAUSES

• Malfunction of the power supply and the earth of 

KOS-ECU

• Malfunction of CAN bus line

DIAGNOSIS PROCEDURE

1. M.U.T.-III CAN bus diagnostics.

2. Check the power supply circuit and the earth 

circuit to KOS-ECU.

Refer to Inspection Procedure 3 "Abnormality in 
KOS-ECU power supply and earth circuits" 

P.42B-35

.

3. Retest the system.

Inspection Procedure 2: The keyless operation key cannot be registered using the M.U.T.-III.

CAUTION

Before replacing the ECU, ensure that the com-
munication circuit is normal.

COMMENTS ON TROUBLE SYMPTOM

If only some keyless operation keys cannot be regis-
tered, the keyless operation key itself may be faulty. 
If no keyless operation key can be registered, the 
key assembly may have already been registered for 
another vehicle, or the KOS-ECU may be faulty.

PROBABLE CAUSES

• Insufficient insertion of keyless operation key into 

key slot

• CAN communication error with OSS-ECU

• OSS-ECU key code not registered

• Malfunction of the keyless operation key

• Malfunction of KOS-ECU

• Keyless operation key already registered to 

another vehicle

DIAGNOSIS PROCEDURE

STEP 1. Sufficiently insert the keyless operation 
key into the key slot, and then check the trouble 
symptom.
Insert the keyless operation key into the key slot 
again, and check whether the keyless operation key 
can be registered.

Q: Is the check result normal?

YES : 

The procedure is complete.

NO : 

Go to Step 2

Keyless entry hazard answerback function or the room lamp answerback function 
does not work normally.

13

P.42B-44

Multimode keyless entry function does not work at all.

14

P.42B-45

Outer buzzer does not sound.

15

P.42B-45

Power door locks with selective unlocking does not work.

16

P.42B-46

Trouble symptom

Inspection 
procedure 
number

Reference 
page

TROUBLESHOOTING <KOS-ECU>

KEYLESS OPERATION SYSTEM (KOS)

42B-35

STEP 2. Interference check of keyless operation 
key when it is inserted in the key slot
Check if there is another keyless operation key 
nearby or anything that interferes with the communi-
cation (magnets or objects that generate radio waves 
such as air-cleaning devices with a power plug).

Q: Are there other keys or anything that interferes 

with the communication?
YES : 

Move away or remove other keyless 

operation keys or anything that interferes 
with the communication. Then, go to Step 3.

NO : 

Go to Step 4

STEP 3. Retest the system
Check that the keyless operation key can be regis-
tered.

Q: Is the check result normal?

YES : 

The procedure is complete.

NO : 

Go to Step 4

STEP 4. M.U.T.-III diagnosis code
Check if any diagnosis code is set to the KOS-ECU.

Q: Is the diagnosis code set?

YES : 

Perform troubleshooting for the KOS-ECU 

(Refer to troubleshooting 

P.42B-11

).

NO : 

Go to Step 5

STEP 5. M.U.T.-III other system diagnosis code
Check if any diagnosis code is set to the OSS-ECU.

Q: Is the diagnosis code set?

YES : 

Perform troubleshooting for the OSS-ECU 

(Refer to troubleshooting 

P.42B-53

).

NO : 

Go to Step 6

STEP 6. Check which keyless operation key 
cannot be registered.

Q: Can any one of the keyless operation keys be 

registered?
YES (Only some keys) : 

Replace the key that 

cannot be registered and register the ID 
codes (Refer to 

P.42B-88

). After registering 

the ID codes, go to Step 8.

NO (All keys) : 

Go to Step 7

STEP 7. Retest the system
Check the M.U.T.-III screen when the key was not 
able to be registered.

Q: Is the error message of M.U.T.-III screen 

"Abnormality in key"?
YES (Abnormality in key) : 

Carry out diagnosis 

code B1A25: Key ID unmatched (Refer to 

P.42B-11

). Then, go to Step 8. 

NO (ECU internal error) : 

Replace KOS-ECU and 

register the ID codes (Refer to 

P.42B-88

).

STEP 8. Retest the system
Check that the keyless operation key can be regis-
tered.

Q: Is the check result normal?

YES : 

The procedure is complete.

NO : 

Go to Step 9

STEP 9. Check whether the diagnosis code is 
reset.
(1) Turn the power supply mode of the engine switch 

from OFF to ON.

(2) Check if the diagnosis code is set.

Q: Is the diagnosis code set?

YES : 

Replace KOS-ECU and register the ID 

codes (Refer to 

P.42B-88

).

NO : 

The procedure is complete.

Inspection Procedure 3: Abnormality in KOS-ECU power supply and earth circuits.

CAUTION

Before replacing the ECU, ensure that the power 
supply circuit, the earth circuit and the communi-
cation circuit are normal.

PROBABLE CAUSES

• Damaged wiring harness and connectors

• Malfunction of KOS-ECU

DIAGNOSIS PROCEDURE

STEP 1. Resistance measurement at KOS-ECU 
connector (GND terminal)
(1) Disconnect the connector, and measure at the 

wiring harness side.

(2) Measure the resistance between the KOS-ECU 

TROUBLESHOOTING <KOS-ECU>

KEYLESS OPERATION SYSTEM (KOS)

42B-36

connector (GND terminal) and body earth.

OK: Continuity exists (2 

Ω or less)

Q: Is the check result normal?

YES : 

Go to Step 3.

NO : 

Go to Step 2.

STEP 2. Check of open circuit in GND line 
between KOS-ECU connector and body earth

Q: Is the check result normal?

YES : 

Intermittent malfunction is suspected (Refer 

to GROUP 00 

− How to Use 

Troubleshooting/Inspection Service Points 

− 

How to Cope with Intermittent Malfunction ).

NO : 

Repair the connector(s) or wiring harness.

STEP 3. Voltage measurement at KOS-ECU 
connector (IG1 terminal)
(1) Disconnect the connector, and measure at the 

wiring harness side.

(2) Check the voltage between the KOS-ECU 

connector (IG1 terminal) and body earth.

OK: System voltage

Q: Is the check result normal?

YES : 

Go to Step 5.

NO : 

Go to Step 4.

STEP 4. Check of short to power supply, short to 
earth, and open circuit in IG1 line between 
ETACS-ECU connector and KOS-ECU connector

Q: Is the check result normal?

YES : 

Intermittent malfunction is suspected (Refer 

to GROUP 00 

− How to Use 

Troubleshooting/Inspection Service Points 

− 

How to Cope with Intermittent Malfunction ).

NO : 

Repair the connector(s) or wiring harness.

STEP 5. Voltage measurement at KOS-ECU 
connector (PWR terminal)
(1) Disconnect the connector, and measure at the 

wiring harness side.

(2) Check the voltage between the KOS-ECU 

connector (PWR terminal) and body earth.

OK: System voltage

Q: Is the check result normal?

YES : 

Replace the KOS-ECU and register the 

chassis number (Refer to 

P.42B-93

).

NO : 

Go to Step 6.

STEP 6. Check of short to power supply, short to 
earth, and open circuit in PWR line between 
fusible link (4) and KOS-ECU connector

Q: Is the check result normal?

YES : 

Intermittent malfunction is suspected (Refer 

to GROUP 00 

− How to Use 

Troubleshooting/Inspection Service Points 

− 

How to Cope with Intermittent Malfunction ).

NO : 

Repair the connector(s) or wiring harness.

Inspection Procedure 4: Keyless operation warning display does not disappear. 

CAUTION

Before replacing the ECU, ensure that the power 
supply circuit, the earth circuit and the communi-
cation circuit are normal.

PROBABLE CAUSES

• Malfunction of CAN bus line

• Malfunction of combination meter

• Damaged wiring harness and connectors

• Malfunction of the KOS-ECU

DIAGNOSIS PROCEDURE

STEP 1. M.U.T.-III CAN bus diagnostics
Use M.U.T.-III to diagnose the CAN bus lines.

Q: Is the check result normal?

YES : 

Go to Step 2.

NO : 

Repair the CAN bus line (Refer to GROUP 
54C 

− Troubleshooting ). On completion, go 

to Step 2.

STEP 2. M.U.T.-III other system diagnosis code
Check if any diagnosis code is set to the combination 
meter.

Q: Is the diagnosis code set?

YES : 

Perform troubleshooting for the combination 

meter (Refer to GROUP 54A 

− Combination 

Meter 

− Troubleshooting ).

NO : 

Go to Step 3.