Inspection Procedure 12

INSPECTION Procedure 12: Delayed finishing wipe 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.

COMMENT ON TROUBLE SYMPTOM
If the delayed finishing wipe function does not properly operate, the input circuit of windshield wiper switch, the input circuit of windshield washer switch, or ETACS-ECU may be defective.

PROBABLE CAUSES
- Malfunction of column switch
- Malfunction of ETACS-ECU
- Damaged harness wires 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-ECU customization function.
Use the ETACS-ECU customization function to check that the "front wiper washer" is set to "On with delayed finishing wipe function."

Q: Is the check result normal?

YES: Go to Step 3.

NO: Use the ETACS-ECU customization function to set the "front wiper washer" to "On with delayed finishing wipe function".

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 washers work normally.

Q: Is the check result normal?

YES: Go to Step 5.

NO: Refer to Inspection Procedure 10 "Windshield washers do not work normally". Inspection Procedure 10

STEP 5. Retest the system
Check that the delayed finishing wipe 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.