INSPECTION PROCEDURE A-4: The Central Door Locking System does not function by using the Door Key Cylinder. <Not Using SWS Monitor>


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

POSSIBLE CAUSES



DIAGNOSIS PROCEDURE


STEP 1. Check the operation of the central door locking system.


Check that the central door locking system works normally.

Q. Is the check result normal?

Go to Step 2.

Refer to inspection procedure A-1 "Central door locking system does not work <Not using SWS monitor>" or <Using SWS monitor>."

STEP 2. Pulse check


Check the input signal, which is related to the door key cylinder operation.
System switch
 Check condition
Door key cylinder (door key switch)
 When the front door 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 3.

Refer to GROUP 54A, inspection procedure C-16 "The signal from the central door lock switch (incorporated with the power windows main switch) is not received <LH drive vehicles> or <RH drive vehicles>."

STEP 3. Retest the system.


Check that the central door locking system works normally by the door key cylinder operation.

Q. Is the check result normal?

The trouble can be an intermittent malfunction (Refer to GROUP 00, How to use Troubleshooting/inspection Service Points - How to Cope with Intermittent Malfunction ).

Replace the ETACS-ECU.