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. 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-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." (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 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. How to Cope With Intermittent Malfunctions.)
NO Replace the ETACS-ECU.