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


caution Before replacing the ECU, ensure that the communication circuit is normal.

COMMENTS ON TROUBLE SYMPTOM


If only some keyless operation keys cannot be registered, 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



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?
The procedure is complete.
Go to Step 2

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 communication (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?
Move away or remove other keyless operation keys or anything that interferes with the communication. Then, go to Step 3.
Go to Step 4

STEP 3. Retest the system
Check that the keyless operation key can be registered.

Q. Is the check result normal?
The procedure is complete.
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?
Perform troubleshooting for the KOS-ECU (Refer to troubleshooting ).
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?
Perform troubleshooting for the OSS-ECU (Refer to troubleshooting ).
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 ). 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 ). Then, go to Step 8.
NO (ECU internal error) : Replace KOS-ECU and register the ID codes (Refer to ).

STEP 8. Retest the system
Check that the keyless operation key can be registered.

Q. Is the check result normal?
The procedure is complete.
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?
Replace KOS-ECU and register the ID codes (Refer to ).
The procedure is complete.