INSPECTION PROCEDURE C-2: The central door locking system does not function by using the driver’s door lock switch.


caution Whenever the ECU is replaced, ensure that the input and output signal circuits are normal.


COMMENT ON TROUBLE SYMPTOM
If the central door locking system does not work normally only when the driver’s door lock switch is operated, the driver’s door lock actuator or the ETACS-ECU may be defective.

POSSIBLE CAUSES

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

DIAGNOSIS PROCEDURE

Step 1. Pulse check
Check the input signal, which is related to the driver’s door lock operation.
System switch
 Check condition
Driver’s door lock actuator switch
 When the driver’s key cylinder or inside lock knob is unlocked or locked
OK: The M.U.T.-III sound or the voltmeter needle fluctuate.

Q. Is the check result normal?
Go to Step 2.
Refer to inspection procedure P-13 "The driver’s door lock actuator signal is not received <LH drive vehicles> or <RH drive vehicles> ."

Step 2. Retest the system.
Check that the central door locking system works normally by the driver’s door lock operation.

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.