INSPECTION PROCEDURE 6: The intermittent wiper interval does not depend on vehicle speed.

COMMENTS ON TROUBLE SYMPTOM
The ETACS-ECU calculates the intermittent wiper interval according to the vehicle speed signal which is sent by the engine-ECU M/T or engine-A/T-ECU A/T.
If the intermittent wiper interval does not depend on the vehicle speed, the input circuit of the vehicle speed signal and the ETACS-ECU may be defective.

POSSIBLE CAUSES

  • Malfunction of the ETACS-ECU
  • Damaged harness wires and connectors

DIAGNOSIS PROCEDURE

Step 1. Retest the system.
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. 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 4.
Refer to GROUP 54C - ETACS, Inspection Procedure 2 "Communication with the ETACS-ECU is not possible ."

Step 4. ECU check by using the SWS monitor.
Check that the vehicle speed signal to the ETACS-ECU is 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 54A, ETACS - Inspection procedure B-2 "Door ajar warning function does not work normally (combination meter (speedometer) operation check) ."

Step 5. Retest the system.
(1)Replace the ETACS-ECU.
(2)Check that the vehicle speed-dependent intermittent wiper system should work normally.

Q. Is the check result normal?
End of diagnosis.
Replace the combination meter.