INSPECTION PROCEDURE H-4: The rear washer does not work.


caution Whenever the ECU is replaced, ensure that the input and output signal circuits are normal.


COMMENTS ON TROUBLE SYMPTOM
If the rear washer does not work normally, the input signal circuits to the rear washer switch, rear washer motor, the column switch, the front-ECU or the ETACS-ECU may be defective.

POSSIBLE CAUSES

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

DIAGNOSIS PROCEDURE

Step 1. Confirm the operation of the rear wiper.
Check that the rear wiper work normally.

Q. Is the check result normal?
Go to Step 2.
Refer to Inspection Procedure H-1 "The rear wiper does 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
  • ETACS ECU
  • Front 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 Inspection Procedure A-2 "Communication with column switch (column-ECU) is not possible ."
"NG" is displayed on the "ETACS ECU" menu. : Refer to Inspection Procedure A-3 "Communication with ETACS-ECU is not possible ."
"NG" is displayed on the "FRONT ECU" menu. : Refer to Inspection Procedure A-4 "Communication with front-ECU is not possible ."

Step 3. Function diagnosis by using the SWS monitor.
Check the SWS communication signal, which are related to the rear washer function.
<Selected item> REAR WIPER-REAR WASHER
  • Ignition switch: ACC
  • Rear washer switch: ON
Item No.
 Item name
 Normal condition
Item 14
 REAR WASH. SW
 ON
OK: Normal condition is displayed.

Q. Is the check result normal?
Go to Step 4.
Refer to inspection procedure P-7 "The column switch (windshield wiper washer and rear wiper washer switch) signal is not received ."

Step 4. Connector check: A-34 washer motor connector.


Q. Is the check result normal?

Go to Step 5.

Repair the connector.

Step 5. Check the washer motor.
Refer to GROUP 51 - Rear wiper and washer .

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

Step 6. Connector check: A-15X front-ECU connector.

Q. Is the check result normal?

Go to Step 7.

Repair the connector.

Step 7. Check the wiring harness between A-34 rear washer motor connector terminal No.1 to A-15X front ECU connector terminal No.21.




  • Check the earth line for open or short circuit.

Q. Is the check result normal?

Go to Step 8.

Repair the wiring harness.

Step 8. Connector check: C-220 ETACS-ECU connector.


Q. Is the check result normal?

Go to Step 9.

Repair the connector.

Step 9. Check the wiring harness between C-220 ETACS-ECU connector terminal No.23 to A-34 washer motor connector terminal No.2.






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

  • Check the output signal line.

Q. Is the check result normal?

Go to Step 10.

Repair the wiring harness.

Step 10. Replace the ETACS-ECU, and then check its operation.
Replace the ETACS-ECU, and then check that the rear washer works normally.
(1)Replace the ETACS-ECU.
(2)Ignition switch: ON
(3)The rear 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 front ECU.