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. Pulse check
Check the input signals below which are related to the windshield wiper.
System switch
 Check condition
Ignition switch (ACC)
 When turned from the LOCK (OFF) position to the ACC position.
Windshield washer switch
 When the switch is turned from off to on.
OK: The M.U.T.-III sounds or the voltmeter needle fluctuates.

Q. Are the check result normal?
All the signals are received normally : Go to Step 3.
The ignition switch (ACC) signal is not received. : Refer to GROUP 54A - ETACS, Inspection procedure C-1 "The ignition switch (ACC) signal is not received ."
Windshield washer switch signal is not received. : Refer to GROUP 54A - ETACS, Inspection procedure C-7 "The column switch (windshield wiper washer and rear wiper washer switch) signal is not received ."

Step 3. Connector check: A-01 windshield washer motor connector

Q. Is the check result normal?
Go to Step 4.
Repair the connector.

Step 4. Check the windshield washer motor assembly.
Refer to .

Q. Is the check result normal?
Go to Step 5.
Replace the windshield washer motor.

Step 5. Connector check: A-09X front-ECU connector.

Q. Is the check result normal?
Go to Step 6.
Repair the connector.

Step 6. 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 7.
Repair the wiring harness.

Step 7. 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.