INSPECTION PROCEDURE 7: The windshield washer does not work normally.
caution Whenever the ECU is replaced, ensure that the input and output signal circuits are normal.




COMMENTS ON TROUBLE SYMPTOM
The windshield washer motor, the column switch, the front-ECU or the ETACS-ECU may be defective.

POSSIBLE CAUSES

  • Malfunction of the windshield washer motor
  • Malfunction of the column switch
  • Malfunction of the front-ECU
  • Malfunction of the ETACS-ECU
  • Damaged harness wires and connectors

DIAGNOSIS PROCEDURE

Step 1. Check the operation of the windshield wipers.
Check that the windshield wipers work normally.

Q. Is the check result normal?
Go to Step 2.
Refer to Inspection Procedure 1 "The windshield wipers do not work at all ."

Step 2. ECU check by using the SWS monitor.
Check that the power supply and earth lines to the column switch (column-ECU) and the front-ECU and the SWS communication lines are normal.

  • Turn the ignition switch to the ACC position.
ECUS TO BE CHECKED
  • COLUMN ECU
  • FRONT ECU
  • ETACS ECU
OK: "OK" are displayed for all the items

Q. Are the check result normal?
"OK" are displayed for all the items : Go to Step 3.
"NG" is displayed on the "COLUMN ECU" menu. : Refer to GROUP 54C - SWS, Inspection Procedure 1 "Communication with column switch (column-ECU) is not possible ."
"NG" is displayed on the "FRONT ECU" menu. : Refer to GROUP 54C - SWS, Inspection Procedure 3 "Communication with the front ECU is not possible ."
"NG" is displayed on the "ETACS ECU" menu. : Refer to GROUP 54C - SWS, Inspection Procedure 2 "Communication with the ETACS ECU is not possible ."

Step 3. Function diagnosis by using the SWS monitor.
Check the SWS communication signal, which are related to the windshield washer function.
Selected item F.WIPER WASH
  • Turn the ignition switch to the ACC position.
  • Windshield washer switch: ON
Item No.
 Item name
 Normal condition
Item 09
 FRONT WASH. SW
 ON
OK: Normal condition is displayed.

Q. Is the check result normal?
Go to Step 4.
Replace the column switch.

Step 4. Connector check: A-01 windshield washer motor connector

Q. Is the check result normal?
Go to Step 5.
Repair the connector.

Step 5. Check the windshield washer motor assembly.
Refer to .

Q. Is the check result normal?
Go to Step 6.
Replace the windshield washer motor.

Step 6. Connector check: A-09X front-ECU connector.

Q. Is the check result normal?
Go to Step 7.
Repair the connector.

Step 7. Check the wiring harness between A-01 windshield washer motor connector terminal No.2 to A-09X front-ECU connector terminal No.21.

  • Check the power supply line for open circuit.

Q. Is the check result normal?
Go to Step 8.
Repair the wiring harness.

Step 8. Replace the front ECU, and then check its operation.
Replace the front ECU, and then check that the windshield washer works normally.
(1)Replace the front ECU.
(2)Ignition switch: ON
(3)The windshield washer should now work normally.

Q. Is the check result satisfactory?
End of diagnosis.
Replace the ETACS-ECU.