INSPECTION PROCEDURE G-4: The windshield wipers do 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 wiper motor, the column switch or the front-ECU may be defective.

POSSIBLE CAUSES

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

DIAGNOSIS PROCEDURE

Step 1. SWS monitor data list
Check the SWS communication signal, which are related to the windshield wipers.
<Selected item> Column switch (column-ECU)
  • Ignition switch: ON
  • Move the windshield wiper switch to each position.
Item No.
 Item name
 Normal condition
Item 31
 IG SW(ACC)
 ON
Item 05
 INT WIPER SW
 ON
Item 06
 LO WIPER SW
 ON
Item 07
 HI WIPER SW
 ON
Item 08
 MIST WIPER SW
 ON
OK: Normal conditions are displayed for all the functions of the switch.

Q. Are the check result normal?
Go to Step 2.
Refer to Inspection Procedure P-6 "The column switch (windshield wiper/washer and rear wiper washer switch) signal is not received ."

Step 2. Connector check: A-01 windshield wiper motor connector.

Q. Is the check result normal?

Go to Step 3.

Repair the defective connector.

Step 3. Check the windshield wiper motor assembly.
Refer to GROUP 51 - Windshield wiper .

Q. Is the check result normal?
Go to Step 4.
Replace the windshield wiper motor assembly.

Step 4. Retest the system.
Check that the windshield wipers work normally by moving the switch to HI or MIST position.

Q. Is the check result normal?
Go to Step 5.
Go to Step 8.

Step 5. Connector check: A-15X front-ECU connector.

Q. Is the check result normal?

Go to Step 6.

Repair the defective connector.

Step 6. Check the wiring harness between A-15X front-ECU connector terminal No.27 to A-01 windshield wiper motor connector terminal No.1.



  • Check the output lines for open circuit.

Q. Is the check result normal?

Go to Step 7.

Repair the wiring harness.

Step 7. Retest the system.
Check that the windshield wipers work normally by moving the switch to each position.

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 front-ECU.

Step 8. Connector check: A-15X front-ECU connector.

Q. Is the check result normal?

Go to Step 9.

Repair the defective connector.

Step 9. Check the wiring harness between A-15X front-ECU connector terminal No.28 to A-01 windshield wiper motor connector terminal No.4.



  • Check the output lines for open circuit.

Q. Is the check result normal?

Go to Step 10.

Repair the wiring harness.

Step 10. Retest the system.
Check that the windshield wipers work normally by moving the switch to each position.

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 front-ECU.