Inspection Procedure C-15: The driver’s door lock actuator switch (unlock switch) signal is not received. <LHD>










caution Whenever the ECU is replaced, ensure that the input signal circuit is normal.

COMMENTS ON TROUBLE SYMPTOM
Input signal from the front door lock actuator (LH) is used to operate the functions below. If the signal is abnormal, these functions will not work normally.

  • Central door locking
  • Keyless entry system
  • Interior lamps

PROBABLE CAUSES

  • Malfunction of the front door lock actuator (LH)
  • Malfunction of the ETACS-ECU
  • Damaged harness wires and connectors

DIAGNOSIS PROCEDURE

STEP 1. Connector check: F-05 front door lock actuator (LH) connector

Q. Is the check result normal?
Go to Step 2.
Repair the defective connector.

STEP 2. Check the front door lock actuator (LH).
Refer to GROUP 42 - Door handle and latch .

Q. Is the check result normal?
Go to Step 3.
Replace the front door lock actuator (LH).

STEP 3. Resistance measurement at the F-05 front door lock actuator (LH) connector
(1)Disconnect the connector, and measure at the wiring harness side.
(2)Resistance between F-05 front door lock actuator (LH) connector terminal No.1 and body earth
OK: Continuity exists (2 Ω or less)

Q. Is the check result normal?
Go to Step 5.
Go to Step 4.

STEP 4. Check the wiring harness between F-05 front door lock actuator (LH) connector terminal No.1 and body earth
note Prior to the wiring harness inspection, check intermediate connector D-133, and repair if necessary.

  • Check the earth wires for open circuit.

Q. Is the check result normal?
The trouble can be an intermittent malfunction (Refer to GROUP 00 - How to Cope with Intermittent Malfunction ).
Repair the wiring harness.

STEP 5. Connector check: D-421 ETACS-ECU connector

Q. Is the check result normal?
Go to Step 6.
Repair the defective connector.

STEP 6. Check the wiring harness between F-05 front door lock actuator (LH) connector terminal No.2 and D-421 ETACS-ECU connector terminal No.36.
note Prior to the wiring harness inspection, check intermediate connector D-132, and repair if necessary.

  • Check the input line for open circuit.

Q. Is the check result normal?
Go to Step 7.
Repair the wiring harness.

STEP 7. Retest the system.
Check that the front door lock actuator (LH) switch signal is received normally.

Q. Is the check result normal?
The trouble can be an intermittent malfunction (Refer to GROUP 00 - How to Cope with Intermittent Malfunction ).
Replace the ETACS-ECU.