Inspection Procedure 6: The intermittent wiper interval is not changed according to the vehicle speed.


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

OPERATION
The ETACS-ECU calculates the intermittent wiper interval according to the vehicle speed signal which is sent by the ABS-ECU <Vehicles without ASC> or ASC-ECU <Vehicles with ASC>.

COMMENTS ON TROUBLE SYMPTOM
If the intermittent wiper interval does not depend on the vehicle speed, the input circuit of the vehicle speed signal (combination meter) and the ETACS-ECU may be defective. Alternatively, the vehicle speed-dependent wiper may be set to "disabled" by using the customise function.

PROBABLE CAUSES

  • Defective combination meter
  • Malfunction of ETACS-ECU
  • Damaged wiring harness and connectors

DIAGNOSTIC PROCEDURE

STEP 1. Check the operation of windshield intermittent wiper volume control.
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 windshield intermittent wiper interval cannot be adjusted by operating the windshield intermittent wiper volume control" .

STEP 2. Check the ETACS customise function.
Use the ETACS customise function to confirm that "FRONT WIPER OPERATION" is set to "VEHICLE SPEED DEPENDENT".

Q. Is the check result normal?
Go to Step 3.
Use the ETACS customise function to set "FRONT WIPER OPERATION" to "VEHICLE SPEED DEPENDENT" (Refer to ).

STEP 3.Check the speedometer.
(1)Connect the M.U.T.-III to the diagnosis connector.
(2)Use the M.U.T.-III to enter simulated vehicle speed.

  • Item No.1: Speedometer (Refer to .)
OK: The speedometer shows that simulated vehicle speed.

Q. Is the check result normal?
Go to Step 4.
Perform the troubleshooting to the speedometer (Refer to GROUP 54A - Combination Meter, Inspection Procedure 5 "Speedometer does not work." Refer to .)

STEP 4. Retest the system.
Check that the intermittent wiper interval depends on the vehicle speed.

Q. Is the check result normal?
Intermittent malfunction (Refer to GROUP 00 - How to Use Troubleshooting/Inspection Service Points - How to Cope with Intermittent Malfunction ).
Replace the ETACS-ECU.