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Inspection Procedure 2: The keyless operation key cannot be registered using scan tool.


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



TECHNICAL DESCRIPTION (COMMENT)


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.

TROUBLESHOOTING HINTS



DIAGNOSIS
Required Special Tools:
  • MB991958: Scan Tool (M.U.T.-III Sub Assembly)

    • MB991824: Vehicle 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. Sufficiently insert the keyless operation key in the inverted direction at the emergency operation, and check the trouble symptom.
With the emergency operation by the sufficient inverse insertion of keyless operation key, check if the key can be registered.

Q. Is the check result normal?
The procedure is complete.
Go to Step 2.

STEP 2. Check the keyless operation key inserted in the key cylinder for interference.

Q. Are there other keyless operation keys or anything that interferes with the communication (things that generate radio waves such as magnets and an air-cleaning device that has a power plug) near the keyless operation key inserted in the key cylinder?
Move away or remove other keyless operation keys or things that interfere with the communication (things that generate radio waves such as magnets and a air-cleaning device that has a power plug) near the keyless operation key. 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 keyless operation key that cannot be registered using scan tool?
Go to Step 4.
The procedure is complete.

STEP 4. 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 6.
NO (All keys) : Go to Step 5.

STEP 5. Retest the system
Check the scan tool screen when the key was not able to be registered.

Q. Is the error message of scan tool screen "Abnormality in key" ?
YES (Abnormality in key) : Carry out DTC B1A25: Key ID unmatched and DTC B1A35: Transponder read error (Refer to <B1A25>, <B1A35>). Then, go to Step 7.
NO (ECU internal error) : Replace KOS-ECU and register the ID codes (Refer to ).

STEP 6. Retest the system
Check that the keyless operation key can be registered.

Q. Is the keyless operation key that cannot be registered using scan tool?
Replace KOS-ECU and register the ID codes (Refer to ).
The procedure is complete.

STEP 7. Retest the system
Check that the keyless operation key can be registered.

Q. Is the keyless operation key that cannot be registered using scan tool?
Go to Step 8.
The procedure is complete.

STEP 8. Check receiver antenna module connector C-10 and KOS-ECU connector C-31 for loose, corroded or damaged terminals, or terminals pushed back in the connector.

Q. Is the receiver antenna module connector C-10 and KOS-ECU connector C-31 in good condition?
Go to Step 9.
Repair the defective connector.

STEP 9. Check the wiring harness between the receiver antenna module connector C-10 (terminal Nos.1, 8, 12, 3, 5, 2, 4) and the KOS-ECU connector C-31 (terminal Nos.12, 32, 7, 9, 13, 11, 10).

  • Check the all harness lines for open circuit and short circuit.

Q. Is the wiring harness between receiver antenna module connector C-10 (terminal Nos.1, 8, 12, 3, 5, 2, 4) and the KOS-ECU connector C-31 (terminal Nos.12, 32, 7, 9, 13, 11, 10) in good condition?
YES : Go to Step 10.
Repair the wiring harness.

STEP 10. Replace the receiver antenna module, and retest the system.
Check that the keyless operation key can be registered.

Q. Is the keyless operation key that cannot be registered using scan tool?
Replace KOS-ECU and register the ID codes (Refer to ).
The procedure is complete.