INSPECTION PROCEDURE C-4: The central door locking system does not function by using the tailgate 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 tailgate key cylinder is operated, the tailgate key switch or the ETACS-ECU may be defective.

POSSIBLE CAUSES

  • Malfunction of the tailgate 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 tailgate key cylinder operation.

  • Tailgate key switch: Neutral to lock
Item No.
 Item name
 Normal condition
Item 18
 TRK UNLOCK SW
 OFF
Item 19
 GATE LOCK SW
 ON (only when operated to lock)
OK: Normal conditions are displayed for all the items.

Q. Are the check result normal?
Go to Step 2.
Refer to inspection procedure P-15 "The tailgate key switch signal is not received ."

Step 2. Retest the system.
Check that the central door locking system works normally by the tailgate 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.