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.








COMMENTS ON TROUBLE SYMPTOM




  • Central door locking
  • 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. Connector check: D-06 front door lock actuator (LH) <LHD> or D-03 front door lock actuator (RH) <RHD> connector


Q. Is the check result normal?





STEP 2. Front door lock actuator (driver’s side) check



Q. Is the check result normal?





STEP 3. Resistance measurement at the D-06 front door lock actuator (LH) <LHD> or D-03 front door lock actuator (RH) <RHD> connector


(1)Disconnect the connector, and measure at the wiring harness side.
(2)Measure the resistance between the D-06 front door lock actuator (RH) connector terminal No. 3 and the body earth. <LHD>
OK: Continuity exists (2 Ω or less)
(3)Measure the resistance between the D-03 front door lock actuator (RH) connector terminal No. 3 and the body earth. <RHD>
OK: Continuity exists (2 Ω or less)

Q. Is the check result normal?





STEP 4. Wiring harness check between the D-06 front door lock actuator (LH) connector (terminal 3) <LHD> or D-03 front door lock actuator (RH) connector (terminal 3) <RHD> and the body earth



note Prior to the wiring harness inspection, check intermediate connector B-22 <LHD>, B-109 <RHD> and earth connector B-25, and repair if necessary.

Q. Is the check result normal?





STEP 5. Connector check B-318 ETACS-ECU connector


Q. Is the check result normal?





STEP 6. Wiring harness check between the D-06 front door lock actuator (LH) connector (terminals 1 or 2) <LHD> or D-03 front door lock actuator (RH) connector (terminals 1 or 2) <RHD> and the B-318 ETACS-ECU connector (terminals 36 or 41).



note Prior to the wiring harness inspection, check intermediate connector B-22 <LHD>, B-109 <RHD>, and repair if necessary.

Q. Is the check result normal?





STEP 7. M.U.T.-III data list



Item No.
 Item name
 Normal condition
20
 Driver’s door unlock switch
 ON → OFF
21
 Driver’s door lock switch
 OFF → ON
OK: Normal condition is displayed.

Q. Is the check result normal?