Inspection Procedure 3: The key reminder switch signal is not received. <Vehicles without KOS>


caution
  • Before replacing the ECU, ensure that the power supply circuit, the earth circuit and the communication circuit are normal.
  • When the ETACS-ECU of vehicles without KOS is replaced, the encrypted code of the ignition key needs to be registered to the ETACS-ECU. (If the encrypted code is not registered, the engine cannot be started. Register the encrypted code as described in Immobilizer System - How to Register Key ID .)

COMMENTS ON TROUBLE SYMPTOM




  • Ignition key reminder function
  • Central door locking
  • Keyless entry system
  • Ignition key cylinder illumination lamp
  • Room lamp

PROBABLE CAUSES



  • Malfunction of the key reminder switch
  • Malfunction of the ETACS-ECU
  • Damaged harness wires and connectors

DIAGNOSIS PROCEDURE


STEP 1. Check the key reminder switch.



Q. Is the check result normal?





STEP 2. Resistance measurement at key reminder switch connector (earth terminal)


(1)Disconnect the connector, and measure at the wiring harness side.
(2)Measure the resistance between the key reminder switch connector (earth terminal) and body earth.
OK: Continuity exists (2 Ω or less)

Q. Is the check result normal?





STEP 3. Check of open circuit in earth line between key reminder switch connector and the body earth


Q. Is the check result normal?





STEP 4. Check of short to power supply, short to earth, and open circuit in HL1+ line between ETACS-ECU connector and key reminder switch connector


Q. Is the check result normal?





STEP 5. M.U.T.-III data list




  • Ignition switch: "LOCK" (OFF) (key inserted)
Item No.
 Item name
 Normal condition
Item 264
 Handle lock switch
 Key in
OK: Normal condition is displayed.

Q. Is the check result normal?