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. Pulse check
Check the input signal, which is related to the tailgate key cylinder operation.
System switch
 Check condition
Tailgate key cylinder (tailgate key switch)
 When the front tail gate key cylinder 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-16 "The tailgate lock release handle 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.