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. Refer to chassis electrical ETACS, "Diagnostic function".

Q: Is the diagnostic trouble code set?

YES: Diagnose the ETACS-ECU. Refer to chassis electrical ETACS, "Diagnostic trouble code chart"

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".

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. Trouble 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 (Refer to general (body and chassis) - How to Use Troubleshooting/Inspection Service Points - How to Cope with Intermittent Malfunction).

NO: Replace the ETACS-ECU.