Inspection procedure G-7: The windshield washer does not work.


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 or the front-ECU may be defective.

POSSIBLE CAUSES

  • Malfunction of the windshield washer motor
  • Malfunction of the column switch
  • Malfunction of the front-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 G-1 "The windshield wipers does 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 Inspection Procedure P-1 "The ignition switch (ACC) signal is not received ."
Windshield washer switch signal is not received. : Refer to Inspection Procedure P-6 "The column switch (windshield wiper washer and rear wiper washer switch) signal is not received ."

Step 3. Connector check: A-34 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 GROUP 51 - Windshield washer.

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

Step 5. Connector check:C-220 ETACS-ECU connector.

Q. Is the check result normal?

Go to Step 6.

Repair the connector.

Step 6. Check the wiring harness between A-34 windshield washer motor connector terminal No.2 to C-220 ETACS-ECU connector terminal No.23.



note Prior to the wiring harness inspection, check the intermediate connector C-125 and repair if necessary.

  • Check the earth wires for open circuit.

Q. Is the check result normal?

Go to Step 7.

Repair the wiring harness.

Step 7. Connector check: A-15X front-ECU connector.

Q. Is the check result normal?

Go to Step 8.

Repair the connector.

Step 8. Check the wiring harness between A-34 windshield washer motor connector terminal No.1 to A-15X front-ECU connector terminal No.21.



  • Check the power supply line for open circuit.

Q. Is the check result normal?

Go to Step 9.

Repair the wiring harness.

Step 9. 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?
The trouble can be an intermittent malfunction (Refer to GROUP 00 - How to Cope with Intermittent Malfunction ).
Replace the ETACS-ECU.