Inspection Procedure 11

Inspection Procedure 11: The intelligent washing function does not work normally.

CAUTION:
Before replacing the ECU, ensure that the power supply circuit, the ground circuit and the communication circuit are normal.

TECHNICAL DESCRIPTION (COMMENT)

If the intelligent washer function does not work normally, the windshield wiper switch input circuit(s), the windshield washer switch input circuit(s) and ETACS-ECU may have a problem.

TROUBLESHOOTING HINTS

- Malfunction of column switch
- Malfunction of ETACS-ECU
- Damaged wiring harness and connectors

DIAGNOSIS

Required Special Tools:

- MB991223: Harness Set
- MB992006: Extra Fine Probe
- MB991958: Scan Tool (M.U.T.-III Sub Assembly)
- MB991824: V.C.I.
- MB991827: M.U.T.-III USB Cable
- MB991910: M.U.T.-III Main Harness A

STEP 1. Use the scan tool MB991958 to check if an ETACS-related diagnostic trouble code is set.





Connect the scan tool. Reading and Clearing Diagnostic Trouble Codes."

Q. Is the diagnostic trouble code set?

YES Diagnose the ETACS-ECU. Electronic Time and Alarm Control System (ETACS)."

NO Go to Step 2.

STEP 2. Check the ETACS customization function.

Use the ETACS-ECU customization function to check that the "intelligent washer" is set to "Enabled."

Q. Is the check result normal?

YES Go to Step 3.
NO Use the ETACS-ECU customization function to set "intelligent washer" to "Enabled." (Refer to Programming and Relearning.)
STEP 3. Windshield wiper operation check

Check that the windshield wipers work normally.

Q. Is the check result normal?

YES Go to Step 4.
NO Refer to trouble symptom chart Symptom Chart.
STEP 4. Windshield washer operation check

Check that the windshield washer works normally.

Q. Is the check result normal?

YES Go to Step 5.
NO Refer to Inspection Procedure 10 "The windshield washer does not work normally Inspection Procedure 10."
STEP 5. System retest

Check that the intelligent washer function works normally.

Q. Is the check result normal?

YES Intermittent malfunction How to Cope With Intermittent Malfunctions.)
NO Replace the ETACS-ECU.