INSPECTION PROCEDURE 6: The intermittent wiper interval does not depend on vehicle speed.<Using SWS monitor>

COMMENTS ON TROUBLE SYMPTOM
The ETACS-ECU calculates the intermittent wiper interval according to the vehicle speed signal via combination meter.
If the intermittent wiper interval does not depend on the vehicle speed, the input circuit of the vehicle speed signal, the ETACS-ECU or the combination meter may be defective.

POSSIBLE CAUSES

  • Malfunction of the combination meter
  • Malfunction of the CAN bus lines
  • Malfunction of the ETACS-ECU
  • Damaged harness wires and connectors

DIAGNOSIS PROCEDURE

Step 1. Check the operation of the intermittent wiper volume.
Check that the windshield intermittent wiper interval can be adjusted by operating the windshield intermittent wiper volume control.

Q. Is the check result normal?
Go to Step 2.
Refer to Inspection Procedure 5 "The intermittent wiper interval cannot be adjusted by operating the windshield intermittent wiper volume control ."

Step 2. Customize function by using the SWS monitor.
Use the SWS monitor customize function to confirm that "Wiper speed-sensitive operation" is set to "With function".

Q. Is the check result normal?
Go to Step 3.
Use the SWS monitor customize function to set the "Wiper speed-sensitive operation" to "With function" (Refer to ).

Step 3. M.U.T.-III CAN bus diagnostics
Use the M.U.T.-III to diagnose the CAN bus lines.

Q. Is the check result normal?
Go to Step 4.
Repair the CAN bus line (Refer to GROUP 54D -Troubleshooting ).

Step 4. ECU check by using the SWS monitor.
Check that the power supply and earth lines to the ETACS-ECU and the SWS communication lines are normal.

  • Ignition switch: ON
ECU TO BE CHECKED
  • ETACS ECU
OK: "OK" is displayed on the "ETACS ECU" menu.

Q. Is the check result normal?
Go to Step 5.
Refer to GROUP 54C - ETACS, Inspection Procedure 2 "Communication with the ETACS-ECU is not possible ."

Step 5. Check the combination meter.
Use the M.U.T.-III to diagnose the speedometer.

Q. Is the check result normal?
Go to Step 6.
Repair the combination meter (Refer to GROUP 54A - Combination meter, Troubleshooting ").

Step 6. Retest the system.
Check that the vehicle speed-dependent intermittent wiper system should work normally.

Q. Is the check result normal?
End of diagnosis.
Replace the ETACS-ECU.