Mitsubishi Outlander (2013+). Manual - part 538

TROUBLESHOOTING <KOS-ECU>

KEYLESS OPERATION SYSTEM (KOS)

42B-13

DIAGNOSIS CODE PROCEDURES

Code No.B1761 Chassis No. not programmed

CAUTION

• When the diagnosis code No. B1761 is set, be 

sure to diagnose the CAN bus line.

• When replacing the ECU, always check that 

the communication circuit is normal.

TROUBLE JUDGMENT

KOS-ECU sets diagnosis code No. B1761 when no 
chassis number is recorded in it.

JUDGMENT CRITERIA

KOS-ECU determines that the abnormality is present 
when no chassis number is recorded in it.

PROBABLE CAUSES

• Malfunction of CAN bus line

• Chassis No. not programmed

• Malfunction of the KOS-ECU

DIAGNOSIS PROCEDURE

1. M.U.T.-III CAN bus diagnostics.

2. Register the chassis No. and recheck the 

diagnosis code.

Code No.B1770 Implausible coding data

CAUTION

• When diagnosis code No. B1770 is set, be 

sure to diagnose the CAN bus line.

• When replacing the ECU, always check that 

the communication circuit is normal.

DIAGNOSIS FUNCTION

If incorrect vehicle information data is received, 
KOS-ECU sets the diagnosis code No. B1770.

JUDGEMENT CRITERIA

If incorrect global coding data is received with the 
ignition switch turned ON when the coding confirma-
tion is completed, KOS-ECU determines that there is 
a problem.

PROBABLE CAUSES

• Malfunction of CAN bus line

• Malfunction of KOS-ECU

• Malfunction of ETACS-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 ).

STEP 2. M.U.T.-III other system diagnosis code
Check if a coding-related diagnosis code is set in the 
ETACS-ECU.

Q: Is the diagnosis code set?

YES : 

Perform troubleshooting for ETACS-ECU 

(Refer to GROUP 54A 

− ETACS − 

Troubleshooting ).

NO : 

Go to Step 3.

STEP 3. Check whether the diagnosis code is 
reset.
Recheck if the diagnosis code is set.
(1) Turn the engine switch from the LOCK (OFF) 

position to the ON position.

(2) Check if the diagnosis code is set.

Q: Is the diagnosis code set?

YES : 

Check if the coding data is sent for the 

vehicles with immobilizer function on 
"non-adaptable" condition. If so, change the 
immobilizer function into "adaptable", and 
then go to Step 4.

NO : 

Intermittent malfunction is suspected (Refer 
to GROUP 00 

− How to Use 

Troubleshooting/Inspection Service Points 

− 

How to Cope with Intermittent Malfunction ).

TROUBLESHOOTING <KOS-ECU>

KEYLESS OPERATION SYSTEM (KOS)

42B-14

STEP 4. Check whether the diagnosis code is 
reset.
Recheck if the diagnosis code is set.
(1) Turn the engine switch from the LOCK (OFF) 

position to the ON position.

(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.

Code No.B1A08 Keyless/KOS key1 performance

 

Code No.B1A09 Keyless/KOS key2 performance

 

Code No.B1A0A Keyless/KOS key3 performance

 

Code No.B1A0B Keyless/KOS key4 performance

CAUTION

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

DIAGNOSTIC FUNCTION

The mechanism which automatically changes a code 
for lock/unlock each time a lock operation is per-
formed is referred to as a rolling code. If KOS-ECU 
receives wrong signal (out of synchronisation of a 
rolling code) from the keyless operation key, 
KOS-ECU memorises the diagnosis code No. 
B1A08, B1A09, B1A0A or B1A0B.

JUDGMENT CRITERIA

• B1A08: If the difference between the rolling code 

for the keyless operation key 1 (the first keyless 
operation key registered with KOS-ECU) and that 
memorised by KOS-ECU is large, it is judged as 
abnormal.

• B1A09: If the difference between the rolling code 

for the keyless operation key 2 (the second key-
less operation key registered with KOS-ECU) and 
that memorised by KOS-ECU is large, it is judged 
as abnormal.

• B1A0A: If the difference between the rolling code 

for the keyless operation key 3 (the third keyless 
operation key registered with KOS-ECU) and that 
memorised by KOS-ECU is large, it is judged as 
abnormal.

• B1A0B: If the difference between the rolling code 

for the keyless operation key 4 (the fourth keyless 
operation key registered with KOS-ECU) and that 
memorised by KOS-ECU is large, it is judged as 
abnormal.

PROBABLE CAUSES

• Rolling code out of synchronisation

• Malfunction of the keyless operation key

• Malfunction of the KOS-ECU

DIAGNOSTIC PROCEDURE

STEP 1. Synchronise the rolling code and 
recheck the diagnosis code.
(1) Synchronise the rolling codes as follows:

• Push the lock switch or unlock switch of key-

less operation key twice or more.

• When the keyless operation is not recovered 

after performing the above procedure, register 
the key again (refer to 

P.42B-88

).

(2) Recheck if the diagnosis code is set.

a. Push the lock switch or unlock switch of 

keyless operation key.

b. Check if the diagnosis code is set.

Q: Is the diagnosis code set?

YES : 

Go to Step 2

NO : 

The diagnosis is complete.

STEP 2. Check whether the diagnosis code is 
reset.
Replace the keyless operation key for which the 
diagnosis code is set with a new one, register the key 
(refer to 

P.42B-88

), and then check whether the 

diagnosis code is set again.
(1) Push the lock switch or unlock switch of keyless 

operation key.

(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 diagnosis is complete.

TROUBLESHOOTING <KOS-ECU>

KEYLESS OPERATION SYSTEM (KOS)

42B-15

Code No.B1A10 Keyless/KOS key 1 low battery

 

Code No.B1A11 Keyless/KOS key 2 low battery

 

Code No.B1A12 Keyless/KOS key 3 low battery

 

Code No.B1A13 Keyless/KOS key 4 low battery

CAUTION

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

DIAGNOSTIC FUNCTION

If KOS-ECU receives the keyless operation key low 
battery voltage signal, KOS-ECU sets the diagnosis 
code No. B1A10, B1A11, B1A12, or B1A13.

JUDGMENT CRITERIA

• B1A10: If KOS-ECU receives the keyless opera-

tion key 1 (the first keyless operation key regis-
tered with KOS-ECU) low battery voltage signal 
in five consecutive times, it is judged as abnor-
mal.

• B1A11: If KOS-ECU receives the keyless opera-

tion key 2 (the second keyless operation key reg-
istered with KOS-ECU) low battery voltage signal 
in five consecutive times, it is judged as abnor-
mal.

• B1A12: If KOS-ECU receives the keyless opera-

tion key 3 (the third keyless operation key regis-
tered with KOS-ECU) low battery voltage signal 
in five consecutive times, it is judged as abnor-
mal.

• B1A13: If KOS-ECU receives the keyless opera-

tion key 4 (the fourth keyless operation key regis-
tered with KOS-ECU) low battery voltage signal 
in five consecutive times, it is judged as abnor-
mal.

PROBABLE CAUSES

• Malfunction of the keyless operation key battery

• Malfunction of the keyless operation key

• Malfunction of KOS-ECU

DIAGNOSTIC PROCEDURE

1. Replace the battery in the keyless operation key 

and recheck the diagnosis code.

2. Replace the keyless operation key and recheck 

the diagnosis code.

Code No.B1A24 Key ID not registered

CAUTION

• When the diagnosis code No. B1A24 is set, be 

sure to diagnose the CAN bus line.

• When replacing the ECU, always check that 

the communication circuit is normal.

DIAGNOSIS FUNCTION

KOS-ECU sets the diagnosis code No. B1A24 when 
the key ID was not registered in it. 

JUDGMENT CRITERIA

KOS-ECU determines that the abnormality is 
present, if the key ID is not registered in it when the 
ignition switch is turned ON.

PROBABLE CAUSES

• Malfunction of CAN bus line

• Key ID not registered

• Malfunction of KOS-ECU

DIAGNOSIS PROCEDURE

1. M.U.T.-III CAN bus diagnostics

2. Register the key ID and recheck the diagnosis 

code.

TROUBLESHOOTING <KOS-ECU>

KEYLESS OPERATION SYSTEM (KOS)

42B-16

Code No.B1A25 Key ID unmatched

CAUTION

• When replacing the ECU, always check that 

the communication circuit is normal.

DIAGNOSTIC FUNCTION

The KOS-ECU stores diagnosis code No. B1A25 
when the received key ID is different from the regis-
tered one or the key slot cannot communicate with 
the key correctly.

JUDGEMENT CRITERIA

KOS-ECU determines that the abnormality is 
present, if the key ID does not match the one regis-
tered in it when the engine switch is turned ON by 
the keyless operation key.

PROBABLE CAUSES

• Malfunction of the keyless operation key

• Malfunction of KOS-ECU

• Key is registered to another vehicle

DIAGNOSIS PROCEDURE

STEP 1. All of the registered keyless operation 
keys should allow the engine switch to be turned 
from OFF to ACC, ON, START positions.
(1) Prepare all of the registered keyless operation 

keys.

(2) Remove the batteries from all of the keyless 

operation keys (Refer to 

P.42B-98

).

(3) Insert one of the keyless operation keys into the 

key slot.

(4) Check whether the engine switch can be turned 

from LOCK (OFF) to ACC, ON, START positions.

(5) Turn the engine switch to LOCK (OFF) position 

again.

(6) Repeat the same procedure for the other keyless 

operation keys.

(7) Install the batteries to all the keyless operation 

keys.

Q: Is the check result normal?

The engine switch can be turned from LOCK (OFF) 
to ACC, ON, START positions by operating all of 
the keyless operation keys. : 

Check if the 

diagnosis code is set. If the diagnosis code 
is erased, the diagnosis is complete. If not, 
go to Step 3.

The engine switch cannot be turned from LOCK 
(OFF) to ACC, ON, START positions by operating 
all of the keyless operation keys. : 

diagnosis code 

No. Check whether diagnosis code B2352 is 
stored.diagnosis code No. If diagnosis code 
B2352 is stored, go to the troubleshooting 
(Refer to 

P.42B-19

). Repeat Step 

1.diagnosis code No. If diagnosis code 
B2352 is not stored, go to Step 2.

STEP 2. Register the keyless operation key(s) 
which cannot activate the engine switch again.
Register the keyless operation key(s) which cannot 
activate the engine switch again (Refer to 

P.42B-88

).

Q: Is the check result normal?

All of the keyless operation keys can be registered 
again. : 

Go to Step 3

All of the keyless operation keys cannot be 
registered again. : 

The keyless operation key(s), 

which cannot be registered, is defective. Put 
it aside. Go to Step 3

STEP 3. Register all of the keyless operation 
keys again.
(1) Register all of the registered keyless operation 

keys again (Refer to 

P.42B-88

).

NOTE: Exclude the keyless operation key(s) 
which you put aside on Step 2.

(2) Remove the batteries from all of the keyless 

operation keys (Refer to 

P.42B-98

).

(3) Insert one of the keyless operation keys into the 

key slot.

(4) Check whether the engine switch can be turned 

from LOCK (OFF) to ACC, ON, START positions.

(5) Turn the engine switch to LOCK (OFF) position 

again.

(6) Repeat the same procedure for the other keyless 

operation keys.

(7) Install the batteries to all the keyless operation 

keys.

Q: Is the check result normal?