Inspection Procedure 15: Keyless entry system does not work.


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






OPERATION



PROBABLE CAUSES



  • Malfunction of CAN bus line
  • Malfunction of the door switches
  • Malfunction of the key reminder switch
  • Malfunction of the receiver antenna module
  • Malfunction of the keyless operation key
  • Damaged wiring harness and connectors
  • Malfunction of the KOS-ECU
  • Malfunction of ETACS-ECU

DIAGNOSIS PROCEDURE


STEP 1. ETACS-ECU coding data check


(1)Use M.U.T.-III to read out the option coding information in ETACS-ECU (Refer to GROUP 00 - Precautions before Service - Coding Reference Table ).
(2)Check if the "Keyless function" is "Enabled."

Q. Is the check result normal?





STEP 2. M.U.T.-III CAN bus diagnostics



Q. Is the CAN bus normal?





STEP 3. M.U.T.-III diagnosis code



Q. Is the diagnosis code set?





STEP 4. Check the power supply system




  • Hazard warning lamp

Q. Is the check result normal?





STEP 5. Check the operation of the central door locking system.



Q. Is the check result normal?





STEP 6. M.U.T.-III data list




  • Turn the ignition switch to the LOCK (OFF) position.
  • Remove the ignition key from the ignition key cylinder.
  • Close the driver’s door.
  • Close the front passenger’s doors.
  • Close the RH-side rear door.
  • Close the LH-side rear door.
  • Close the tailgate.
Item No.
 Item name
 Normal condition
Item 256
 Dr door ajar switch
 Close
Item 257
 As door ajar switch
 Close
Item 258
 RR door ajar switch
 Close
Item 259
 RL door ajar switch
 Close
Item 260
 Trunk/gate trunk ajar switch
 Close
Item 264
 Handle lock switch
 Key in → Key out
OK: Normal conditions are displayed for all the items.

Q. Is the check result normal?















STEP 7. Connector check: C-07 receiver antenna module connector, C-23 KOS-ECU connector


Q. Is the check result normal?





STEP 8. Check the wiring harness between the C-07 receiver antenna module connector terminal No. 3, 5, 8 and the C-23 KOS-ECU connector terminal No. 9, 13, 32.



  • Check the communication and earth lines for open circuit or short circuit.

Q. Is the check result normal?





STEP 9. Check with another registered keyless operation key.



Q. Can the keyless entry function be used?





STEP 10. Check of the troubles



Q. Is the check result normal?