INSPECTION PROCEDURE A-3: The Central Door Locking System does not function by using The Door Lock Switch (incorporated with the power windows main switch). <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 lock switch (incorporated with the power windows main switch) is operated, the door lock switch (incorporated with the power windows main switch) or the ETACS-ECU may be defective.

POSSIBLE CAUSES



DIAGNOSIS PROCEDURE


Step 1. ETACS switch data by using the SWS monitor


Check the ETACS-ECU signal, which is related to the door lock switch operation.

Item No.
 Item name
 Normal condition
Item 26
 Centre door lock switch
 ON (only when operated to lock)
Item 27
 Centre door unlock switch
 OFF

Item No.
 Item name
 Normal condition
Item 26
 Centre door lock switch
 OFF
Item 27
 Centre door unlock switch
 ON (only when operated to unlock)
OK: Normal condition are displayed for all the items.

Q. Are the check result normal?

Go to Step 2.

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 2. Retest the system.


Check that the central door locking system works normally by the driver’s door lock 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.