Inspection Procedure 2: The keyless operation key cannot be registered using the M.U.T.-III.
caution
Keyless operation key is registered to another vehicle.
If commercial electric products are connected, communication with the keyless operation key cannot be performed normally, and the key registration may fail. When performing the registration, disconnect all the commercial electric products.
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&OSS-ECU may be faulty.
PROBABLE CAUSES
Keyless operation key is registered to another vehicle
Insufficient insertion of keyless operation key into key slot
When registering the keyless operation key, commercial electric products are connected or there is something that interferes with the communication.
Malfunction of the keyless operation key
Malfunction of KOS&OSS-ECU
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 in the KOS&OSS-ECU.
Q.
Is the diagnosis code set?
Perform troubleshooting for the KOS&OSS-ECU (Refer to ).
Go to Step 5.
STEP 5. 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 7.
NO (All keys) : Go to Step 6.
STEP 6. Retest the system
Check the M.U.T.-III screen when the key was not able to be registered.
Q.
Does the error message on the M.U.T.-III screen indicate that the key is defective?
YES (Abnormality in key) : Carry out diagnosis code B1A25: Transponder ID unmatched (Refer to ). Then, go to Step 7.
NO (ECU internal error) : Replace KOS&OSS-ECU and register the ID codes (Refer to ).
STEP 7. 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 8.
STEP 8. Check whether the diagnosis code is set again.
(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&OSS-ECU and register the ID codes (Refer to ).