INSPECTION PROCEDURE 6: The intermittent wiper interval is not changed according to the vehicle speed.




OPERATION
The ETACS-ECU calculates the intermittent wiper interval according to the vehicle speed signal which is sent by the Combination meter.

COMMENTS ON TROUBLE SYMPTOM
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. Alternatively, the vehicle speed-dependent wiper may be set to "disabled" by using the customisation function.

PROBABLE CAUSES

  • The CAN bus line is defective.
  • Malfunction of ETACS-ECU
  • Damaged wiring harness and connectors

DIAGNOSTIC 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 windshield intermittent wiper interval cannot be adjusted by operating the windshield intermittent wiper volume control" .

STEP 2. Check the ETACS customisation function.
Use the ETACS customisation 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 customisation function to set "FRONT WIPER OPERATION" to "VEHICLE SPEED DEPENDENT" (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 54C - Diagnosis ).

STEP 4. M.U.T.-III other system diagnosis code
Check that the Combination meter sets a diagnosis code.

Q. Is the diagnosis code set?
Diagnose the Combination meter (Refer to GROUP 54A- Diagnosis Code Chart ).
Go to Step 5.

STEP 5. 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.