Inspection Procedure 15: Keyless Entry System does not Work at All.


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

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. M.U.T.-III other system data list



(1)Close each door and tailgate from the open state.
(2)Turn the ignition switch to the OFF (key inserted) position.
Item No.
 Item name
 Normal conditions
Item 256
 Dr door ajar switch
 Open → Close
Item 257
 As door ajar switch
 Open → Close
Item 258
 RR door ajar switch
 Open → Close
Item 259
 RL door ajar switch
 Open → Close
Item 260
 Trunk/gate trunk ajar switch
 Open → Close
Item 264
 Handle lock switch
 Key in
OK: Normal conditions are displayed for all the items.

Q. Are the check result normal?















STEP 4. Connector check: C-34 receiver antenna module connector, C-104 KOS-ECU connector


Q. Is the check result normal?





STEP 5. Check the wiring harness between the C-34 receiver antenna module connector terminal Nos. 1, 2, 8, 12 and the C-104 KOS-ECU connector terminal Nos. 12, 11, 32, 7.



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

Q. Is the check result normal?





STEP 6. Check with another registered keyless operation key.



Q. Can the keyless entry function be used?





STEP 7. Check of the troubles



Q. Is the check result normal?