Inspection Procedure 8: No Door will be Locked or Unlocked by Operating A Lock Switch on any Door, or by touching The Unlock Sensor.


caution Before replacing the ECU, ensure that the power supply circuit, the earth circuit and the communication circuit are normal.










PROBABLE CAUSES



  • Malfunction of the CAN bus lines
  • Malfunction of the central door locking system
  • Malfunction of the keyless operation key
  • Malfunction of the key reminder switch
  • Damaged wiring harness and connectors
  • Malfunction of the KOS-ECU
  • Function setting error or no setting with a customisation

DIAGNOSTIC PROCEDURE


STEP 1. M.U.T.-III CAN bus diagnostics



Q. Is the check result normal?





STEP 2. M.U.T.-III diagnosis code



Q. Is the diagnosis code set?





STEP 3. Check the central door locking operation



Q. Is the check result normal?





STEP 4. Check the customisation



Q. Is it set to "Both enable"?





STEP 5. Key reminder switch check


(1)Disconnect the C-315 ETACS-ECU connector.
(2)Measure the resistance at the harness-side connector with the ignition key removed from the ignition key cylinder.
(3)Check the continuity between the C-315 ETACS-ECU connector terminal No. 13 and the earth.
OK: Continuity exists (2 Ω or less)

Q. Is the check result normal?





STEP 6. Check with another registered keyless operation key.


Q. Does the IG knob turn? (Is the keyless operation key recognised?)





STEP 7. Check of the troubles



Q. Is the check result normal?