Mitsubishi Outlander GS45X. Manual - part 1116

DIAGNOSIS

TSB Revision

KEYLESS OPERATION SYSTEM (KOS)

42B-43

DTC B1A24: Key ID not registered

CAUTION

• When the DTC B1A24 is set, be sure to diag-

nose the CAN bus line.

• When replacing the ECU, always check that 

the communication circuit is normal.

.

DTC SET CONDITION

KOS-ECU sets the DTC B1A24 when the key ID was 
not registered in it. 

.

TECHNICAL DESCRIPTION (COMMENT)

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

.

ROUBLESHOOTING HINTS

• Key ID not registered

• Malfunction of the keyless operation key

• Malfunction of KOS-ECU

DIAGNOSIS

Required Special Tools:

• MB991958: Scan Tool (M.U.T.-III Sub Assembly)

• MB991824: Vehicles Communication Interface (V.C.I.)

• MB991827: M.U.T.-III USB Cable

• MB991910: M.U.T.-III Main Harness A (Vehicles with 

CAN communication system)

STEP 1. Using scan tool MB991958, diagnose the CAN bus 
line.

CAUTION

To prevent damage to scan tool (MB991958), always turn 
the ignition switch to the "LOCK" (OFF) position before 
connecting or disconnecting scan tool (MB991958).
(1) Connect scan tool MB991958 to the data link connector.
(2) Turn the ignition switch to the "ON" position.
(3) Diagnose the CAN bus line.
(4) Turn the ignition switch to the "LOCK" (OFF) position.
Q: Is the CAN bus line found to be normal?

YES : Go to Step 2.
NO :  Repair the CAN bus line. (Refer to GROUP 54C, 

Diagnosis 

P.54C-17

).

ZC501967

AC404789

AC701411AB

MB991824

MB991827

MB991910

Data link 
connector

DIAGNOSIS

TSB Revision

KEYLESS OPERATION SYSTEM (KOS)

42B-44

STEP 2. Register the key ID and recheck the diagnostic 
trouble code.
Register the key ID and keyless operation key ID of the keyless 
operation key by which the DTC is set (refer to 

P.42B-15

), and 

recheck if the DTC is set.
(1) Turn the ignition switch from the "LOCK" (OFF) position to 

the "ON" position.

(2) Check if the DTC is set.
Q: Is the diagnostic trouble code set?

YES : Replace KOS-ECU and register the ID codes. (Refer 

to 

P.42B-15

.)

NO :  The procedure is complete.

DTC B1A25: Key ID unmatched

CAUTION

• When the DTC B1A25 is set, be sure to diag-

nose the CAN bus line.

• When replacing the ECU, always check that 

the communication circuit is normal.

.

DTC SET CONDITION

KOS-ECU sets the DTC B1A25 when the received 
key ID is different from the one registered in it. 

.

TECHNICAL DESCRIPTION (COMMENT)

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

.

TROUBLESHOOTING HINTS

• Malfunction of the keyless operation key

• Accessory key not registered

• Accessory KOS-ECU not registered

• Key is registered to another vehicle

• Malfunction of KOS-ECU

DIAGNOSIS

Required Special Tools:

• MB991958: Scan Tool (M.U.T.-III Sub Assembly)

• MB991824: Vehicles Communication Interface (V.C.I.)

• MB991827: M.U.T.-III USB Cable

• MB991910: M.U.T.-III Main Harness A (Vehicles with 

CAN communication system)

DIAGNOSIS

TSB Revision

KEYLESS OPERATION SYSTEM (KOS)

42B-45

STEP 1. Using scan tool MB991958, diagnose the CAN bus 
line.

CAUTION

To prevent damage to scan tool (MB991958), always turn 
the ignition switch to the "LOCK" (OFF) position before 
connecting or disconnecting scan tool (MB991958).
(1) Connect scan tool MB991958 to the data link connector.
(2) Turn the ignition switch to the "ON" position.
(3) Diagnose the CAN bus line.
(4) Turn the ignition switch to the "LOCK" (OFF) position.
Q: Is the CAN bus line found to be normal?

YES : Go to Step 2.
NO :  Repair the CAN bus line. (Refer to GROUP 54C, 

Diagnosis 

P.54C-17

).

STEP 2. Register the key ID and recheck the diagnostic 
trouble code.
Register the key ID and keyless operation key ID of the keyless 
operation key by which the DTC is set (refer to 

P.42B-15

), and 

recheck if the DTC is set.
(1) Turn the ignition switch from the "LOCK" (OFF) position to 

the "ON" position.

(2) Check if the DTC is set.
Q: Is the DTC set?

YES : Go to Step 3.
NO :  The procedure is complete.

STEP 3. Replace the keyless operation key and recheck 
the diagnostic trouble code.
Replace the keyless operation key for which the DTC is set 
with the other key, and check whether the DTC is reset.
(1) Turn the ignition switch from the "LOCK" (OFF) position to 

the "ON" position.

(2) Check if the DTC is set.
Q: Is the DTC set?

YES : Go to Step 4.
NO :  Go to Step 5.

ZC501967

AC404789

AC701411AB

MB991824

MB991827

MB991910

Data link 
connector

DIAGNOSIS

TSB Revision

KEYLESS OPERATION SYSTEM (KOS)

42B-46

STEP 4. Register the key ID and recheck the diagnostic 
trouble code.
Register the key ID and keyless operation key ID of the keyless 
operation key by which the DTC is set (refer to 

P.42B-15

), and 

recheck if the DTC is set.
(1) Turn the ignition switch from the "LOCK" (OFF) position to 

the "ON" position.

(2) Check if the DTC is set.
Q: Is the DTC set?

YES : Go to Step 5.
NO :  The procedure is complete.

STEP 5. Replace the keyless operation key and recheck 
the diagnostric trouble code.
Replace the keyless operation key for which the DTC is set 
with a new one, register the key ID and keyless operation key 
ID (refer to 

P.42B-15

), and check whether the DTC is reset.

(1) Turn the ignition switch from the "LOCK" (OFF) position to 

the "ON" position.

(2) Check if the DTC is set.
Q: Is the DTC set?

YES : Replace KOS-ECU and register the ID codes (Refer 

to 

P.42B-15

).

NO :  The procedure is complete.

DTC B1A28: Engine control module authenticate error

CAUTION

• When the DTC B1A28 is set, be sure to diag-

nose the CAN bus line.

• When replacing the ECU, always check that 

the communication circuit is normal.

.

DTC SET CONDITION

If the key certification result by KOS-ECU does not 
match with the engine control module status, 
KOS-ECU sets the DTC B1A28.

.

TECHNICAL DESCRIPTION (COMMENT)

KOS-ECU determines that the abnormality is 
present, if the key certification result and the engine 
control module status do not match after the engine 
start permission communication is completed.

.

TROUBLESHOOTING HINTS

• Malfunction of CAN bus line

• Malfunction of KOS-ECU

• Engine control module malfunction

• VIN registered in engine control module 

unmatched

DIAGNOSIS

Required Special Tools:

• MB991958: Scan Tool (M.U.T.-III Sub Assembly)

• MB991824: Vehicles Communication Interface (V.C.I.)

• MB991827: M.U.T.-III USB Cable

• MB991910: M.U.T.-III Main Harness A (Vehicles with 

CAN communication system)