INSPECTION PROCEDURE C-3: The central door locking system does not function by using the passenger’s door key cylinder.


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 front passenger’s key cylinder is operated, the front passenger’s door key switch or the ETACS-ECU may be defective.

POSSIBLE CAUSES

  • Malfunction of the front passenger’s door key switch
  • Malfunction of the ETACS-ECU
  • Damaged harness wires and connectors

DIAGNOSIS PROCEDURE

Step 1. ETACS switch data by using the SWS monitor
Check the ETACS-ECU signal, which is related to the front passenger’s key cylinder operation.

  • passenger’s door lock key cylinder: Neutral to lock
Item No.
 Item name
 Normal condition
Item 26
 CNTR DOOR LCK
 ON (only when operated to lock)
Item 27
 CNTR DOOR ULK
 OFF
OK: Normal conditions are displayed for all the items.

Q. Are the check result normal?
Go to Step 2.
Refer to inspection procedure P-14 "The passenger’s door lock key switch signal is not detected <LH drive vehicles> or <RH drive vehicles>."

Step 2. Retest the system.
Check that the central door locking system works normally by the front passenger’s key cylinder 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.