Mitsubishi Outlander (2013+). Manual - part 635

IMMOBILIZER SYSTEM <Vehicles without keyless operation system>

CHASSIS ELECTRICAL

54A-25

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

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

JUDGMENT CRITERIA

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

PROBABLE CAUSES

• Malfunction of CAN bus line

• Key ID not registered

• 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. Register the key ID and recheck the 
diagnosis code.
Register the key ID of the ignition key by which the 
diagnosis code is set (Refer to 

P.54A-33

), and 

recheck if the diagnosis code is set.
(1) Insert the ignition key into ignition switch. 

Remove the ignition key from the ignition switch, 
and then insert the key again. Turn the ignition 
switch to the ON position within 2 to 3 seconds.

(2) Check if the diagnosis code is set.

Q: Is the diagnosis code set?

YES : 

Replace ETACS-ECU and register the ID 

codes (Refer to 

P.54A-33

).

NO : 

The diagnosis is complete.

Code No.B1A25 Key ID unmatched

CAUTION

• When the diagnosis code No. B1A25 is set, be 

sure to diagnose the CAN bus line.

• When replacing the ECU, always check that 

the communication circuit is normal.

DIAGNOSIS FUNCTION

ETACS-ECU sets the diagnosis code No. B1A25 
when the received key ID is different from the one 
registered in it. 

JUDGEMENT CRITERIA

ETACS-ECU determines that the abnormality is 
present, if the key ID for the ignition key does not 
match the one registered in ETACS-ECU when the 
ignition switch is turned ON.

PROBABLE CAUSES

• Malfunction of CAN bus line

• Malfunction of the ignition key

• Malfunction of ETACS-ECU

• Accessory key not registered

• Key is registered to another vehicle

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. Register the key ID and recheck the 
diagnosis code.
Register the key ID of the ignition key by which the 
diagnosis code is set (Refer to 

P.54A-33

), and 

recheck if the diagnosis code is set.
(1) Insert the ignition key into ignition switch. 

Remove the ignition key from the ignition switch, 
and then insert the key again. Turn the ignition 
switch to the ON position within 2 to 3 seconds.

(2) Check if the diagnosis code is set.

IMMOBILIZER SYSTEM <Vehicles without keyless operation system>

CHASSIS ELECTRICAL

54A-26

Q: Is the diagnosis code set?

YES : 

Go to Step 3

NO : 

The diagnosis is complete.

STEP 3. Replace the ignition key with another 
registered key for the vehicle, and recheck the 
diagnosis code.
Replace the ignition key by which the diagnosis code 
is set with another ignition key nearby, and recheck if 
the diagnosis code is set.
(1) Insert the ignition key into ignition switch. 

Remove the ignition key from the ignition switch, 
and then insert the key again. Turn the ignition 
switch to the ON position within 2 to 3 seconds.

(2) Check if the diagnosis code is set.

Q: Is the diagnosis code set?

YES : 

Go to Step 4

NO : 

Go to Step 5

STEP 4. Register the key ID and recheck the 
diagnosis code.
Register the key ID of the ignition key by which the 
diagnosis code is set in Step 3 (refer to 

P.54A-33

), 

and recheck if the diagnosis code is set.
(1) Insert the ignition key into ignition switch. 

Remove the ignition key from the ignition switch, 
and then insert the key again. Turn the ignition 
switch to the ON position within 2 to 3 seconds.

(2) Check if the diagnosis code is set.

Q: Is the diagnosis code set?

YES : 

Go to Step 5

NO : 

The diagnosis is complete.

STEP 5. Replace the ignition key with a new one, 
and recheck the diagnosis code.
Replace the ignition key by which the diagnosis code 
is set with a new one, register the key ID of the new 
key, (refer to 

P.54A-33

), and recheck if the diagnosis 

code is set.
(1) Insert the ignition key into ignition switch. 

Remove the ignition key from the ignition switch, 
and then insert the key again. Turn the ignition 
switch to the ON position within 2 to 3 seconds.

(2) Check if the diagnosis code is set.

Q: Is the diagnosis code set?

YES : 

Replace ETACS-ECU and register the ID 

codes (Refer to 

P.54A-33

).

NO : 

The diagnosis is complete.

Code No.B1A28 Engine

−ECU authentication error

CAUTION

• When the diagnosis code No. B1A28 is set, be 

sure to diagnose the CAN bus line.

• When replacing the ECU, always check that 

the communication circuit is normal.

DIAGNOSIS FUNCTION

ETACS-ECU sets diagnosis code No. B1A28 when 
the ETACS-ECU's key certification result and the 
engine-ECU's starting condition do not match.

JUDGEMENT CRITERIA

ETACS-ECU determines that the abnormality is 
present, if the key certification result OK but 
engine-ECU prohibits engine start by immobilizer 
function or key certification result NG but engine per-
mits engine starts.

PROBABLE CAUSES

• Malfunction of CAN bus line

• Malfunction of ETACS-ECU

• Engine-ECU malfunction

• Chassis number registered in engine-ECU 

unmatched

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 whether an engine-related diagnosis code is 
set.

Q: Is the diagnosis code set?

YES : 

Perform troubleshooting for the engine 

(Refer to GROUP 13A 

− Troubleshooting ).

NO : 

Go to Step 3.

STEP 3. Diagnosis code check

Q: Is diagnosis code No. B1761 or B2206 set?

IMMOBILIZER SYSTEM <Vehicles without keyless operation system>

CHASSIS ELECTRICAL

54A-27

YES : 

Proceed to diagnosis code No. B1761 ( 

Chassis No. not programmed) or diagnosis 
code No. B2206 (Chassis No. mismatch) 
(Refer to 

P.54A-283

 <B1761>, 

P.54A-286

 

<B2206>).

NO : 

Go to Step 4.

STEP 4. Check whether the diagnosis code is 
reset.
Recheck if the diagnosis code is set.
(1) Once key is removed from the ignition cylinder 

and then turn the ignition 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 ETACS-ECU and register the ID 

codes (Refer to 

P.54A-33

). Then go to Step 

5.

NO : 

The diagnosis is complete.

STEP 5. Check whether the diagnosis code is 
reset.
Recheck if the diagnosis code is set.
(1) Turn the ignition 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 the engine-ECU and register the 

chassis number and key codes [Refer to 
GROUP 00 

− How to Perform Chassis 

Number (Chassis No.) Writing ].

NO : 

The diagnosis is complete.

Code No.B1A35 Transponder read error

CAUTION

• When the diagnosis code No. B1A35 is set, be 

sure to diagnose the CAN bus line.

• When replacing the ECU, always check that 

the communication circuit is normal.

DIAGNOSIS FUNCTION

ETACS-ECU sets the diagnosis code No. B1A35 
when it cannot receive data from the transponder.

JUDGEMENT CRITERIA

ETACS-ECU determines that the abnormality is 
present, if it cannot receive the key ID for the ignition 
key when the ignition switch is turned ON.

PROBABLE CAUSES

• Malfunction of CAN bus line

• Malfunction of the ignition key

• Malfunction of receiver antenna

• Malfunction of ETACS-ECU

• Interference of the key ID

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. Check the ignition key inserted in the 
key cylinder for interference.

Q: Are there other ignition keys or anything that 

interferes with the communication (things that 
generate radio waves such as magnets or 
air-cleaning device that has a power plug) near the 
ignition key inserted in the key cylinder?
YES : 

Move away or remove other ignition keys or 

anything that interferes with the 
communication, and go to Step 3. 

NO : 

Go to Step 3.

STEP 3. Check whether the diagnosis code is 
reset.
Recheck if the diagnosis code is set.
(1) Turn the ignition 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 : 

Go to Step 4.

NO : 

The diagnosis is complete.

STEP 4. Replace the ignition key with another 
registered key for the vehicle, and recheck the 
diagnosis code.
Replace the ignition key by which the diagnosis code 
is set with another ignition key nearby, and recheck if 
the diagnosis code is set.
(1) Turn the ignition switch from the LOCK (OFF) 

position to the ON position.

IMMOBILIZER SYSTEM <Vehicles without keyless operation system>

CHASSIS ELECTRICAL

54A-28

(2) Check if the diagnosis code is set.

Q: Is the diagnosis code set?

YES : 

Go to Step 5.

NO : 

Go to Step 6.

STEP 5. Register the key ID and recheck the 
diagnosis code.
Register the key ID of the ignition key by which the 
diagnosis code is set in Step 4 (refer to 

P.54A-33

), 

and recheck if the diagnosis code is set.
(1) Turn the ignition 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 : 

Go to Step 6.

NO : 

The diagnosis is complete.

STEP 6. Replace the ignition key with a new one, 
and recheck the diagnosis code.
Replace the ignition key by which the diagnosis code 
is set with a new one, register the key ID of the new 
key, (refer to 

P.54A-33

), and recheck if the diagnosis 

code is set.
(1) Turn the ignition 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 : 

Go to Step 7.

NO : 

The diagnosis is complete.

STEP 7. Replace the receiver antenna, and 
recheck the diagnosis code.
Replace the receiver antenna, register the key ID of 
the new key (refer to 

P.54A-33

), and recheck if the 

diagnosis code is set.
(1) Turn the ignition 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 ETACS-ECU and register the ID 

codes (Refer to 

P.54A-33

).

NO : 

The diagnosis is complete.

Code No.B2352 Antenna fail

CAUTION

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

DIAGNOSIS FUNCTION

ETACS-ECU sets the diagnosis code No. B2352 
when open or short circuit to the earth in the antenna 
at the key reminder switch is detected.

JUDGMENT CRITERIA

When during the transponder communication, the 
antenna at the key reminder switch (immobilizer 
antenna) malfunction is found, ETACS-ECU deter-
mines that the abnormality is present.

PROBABLE CAUSES

• Malfunction of key reminder switch (open circuit 

of immobilizer antenna)

• Damaged wiring harness and connectors

• Malfunction of receiver antenna

• Malfunction of ETACS-ECU

DIAGNOSIS PROCEDURE

STEP 1. M.U.T.-III data list
Check the ETACS-ECU service data.

•

Item No.

Item name

Normal 
condition

Item 264

Handle lock switch

Key in

Turn the ignition switch to the OFF (key inserted) 
position.

OK: Normal condition is displayed.

Q: Is the check result normal?

YES : 

Go to Step 2.

NO : 

Refer to GROUP 54A 

− Inspection 

Procedure 3: "Key reminder switch signal is 
not received 

P.54A-314

."

STEP 2. Resistance measurement at the receiver 
antenna connector (ANTP, ANTG line).
(1) Disconnect the connector and measure the 

resistance at the wiring harness side.

(2) Insert the ignition key into ignition switch.
(3) Measure the resistance between the receiver