Inspection Procedure 4: The front door lock actuator (driver’s side) signal is not received.


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




  • Key reminder function
  • Central door locking
  • KOS
  • Keyless entry system
  • Room lamp

PROBABLE CAUSES



  • Malfunction of the front door lock actuator (driver’s side)
  • Malfunction of the ETACS-ECU
  • Damaged harness wires and connectors

DIAGNOSIS PROCEDURE


STEP 1. Front door lock actuator (driver’s side) check



Q. Is the check result normal?





STEP 2. Resistance measurement at front door lock actuator (LH) connector (earth terminal)


(1)Disconnect the connector, and measure at the wiring harness side.
(2)Measure the resistance between the door lock actuator (LH) 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 front door lock actuator (LH) connector and body earth


Q. Is the check result normal?





STEP 4. Check of short to power supply, short to earth, and open circuit in DDUK line between ETACS-ECU connector and front door lock actuator (LH) connector


Q. Is the check result normal?





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



Item No.
 Item name
 Normal condition
Item 271
 Dr door unlock switch
 Unlock → Lock
OK: Normal condition is displayed.

Q. Is the check result normal?