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. Pulse check
Check the input signal, which is related to the front passenger’s door key cylinder operation.
System switch
 Check condition
Front passenger’s key cylinder (front passenger’s door key switch)
 When the passenger’s 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-14 "The passenger’s door lock key switch 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 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.