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

Check that the central door locking system works normally by means of the driver's door key cylinder and inside lock knob.

Q: Is the check result normal?

YES:  Go to Step 2.
NO:  Refer to Inspection Procedure C-1 "Central door locking system does not work <LH drive vehicles> ." Refer to Inspection Procedure C-1 "Central door locking system does not work <RH drive vehicles> ."

Step 2. ECU check by using the SWS monitor

Check that the power supply and earth lines to the ETACS-ECU and the SWS communication lines are normal.

• Ignition switch: OFF

ECUS TO BE CHECKED

• ETACS ECU

OK: "OK" is displayed on the "ETACS ECU" menu.

Q: Is the check result normal?

YES:  Go to Step 3.
NO:  Refer to Inspection Procedure A-3 "Communication with ETACS-ECU is not possible ."

Step 3. Pulse check

Check the input signal from the front passenger’s door lock key cylinder switch.

System switch	Check condition
Passenger’s door lock key cylinder switch	Turn the key to the lock or unlock position

OK: The MUT-II/III sound or the voltmeter needle fluctuate.

Q: Is the check result normal?

YES:  Go to Step 4.
NO:  Refer to Inspection Procedure P-19 "The front passenger's door lock key cylinder switch signal is not detected <LH drive vehicles> ." Refer to Inspection Procedure P-19 "The front passenger's door lock key cylinder switch signal is not detected <RH drive vehicles> ."

Step 4. Retest the system.

Check that the central door locking system works normally by means of the front passenger's door key cylinder.

Q: Is the check result normal?

YES:  The trouble can be an intermittent malfunction (Refer to GROUP 00 - How to Cope with Intermittent Malfunction ).
NO:  Replace the ETACS-ECU.