Inspection Procedure 4: The rear 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
If the rear washer does not work normally, the input signal circuits to the rear washer switch, rear washer motor or the ETACS-ECU may be defective.

POSSIBLE CAUSES

  • Malfunction of the 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 works normally.

Q. Is the check result normal?
Go to Step 2.
Refer to Inspection Procedure 1 "The rear wiper does not operate 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" is displayed for all the items

Q. Are the check result normal?
"OK" is 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 the column switch (column-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 ."
"NG" is displayed on the "FRONT ECU" menu. : Refer to GROUP 54C - SWS, Inspection Procedure 3 "Communication with the 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 GROUP 54A - ETACS, Inspection procedure C-7 "The column switch (windshield wiper washer and rear wiper washer switch) signal is not received ."

Step 4. Connector check: G-07 washer motor connector.

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

Step 5. Check the washer motor.
Refer to .

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

Step 6. Confirm the operation of the windshield washer.
Check that the windshield washer works normally.

Q. Is the check result normal?
Replace the ETACS-ECU.
Go to Step 7.

Step 7. Connector check: D-421 ETACS-ECU connector.

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

Step 8. Check the wiring harness between D-421 ETACS-ECU connector terminal No.23 and G-07 washer motor connector terminal No.2.
note Prior to the wiring harness inspection, check intermediate connector D-219 and E-105, and repair if necessary.

  • Check the output signal line.

Q. Is the check result normal?
Go to Step 9.
Repair the wiring harness.

Step 9. Retest the system.
Check that the rear washer works normally.

Q. Is the check result normal?
The trouble can be an intermittent malfunction (Refer to GROUP 00 - How to Cope with Intermittent Malfunction ).
Replace the ETACS-ECU.