INSPECTION PROCEDURE 9: The rain sensitive AUTO wiper function works even though there is no rainfall <Vehicles with lighting control sensor>.


caution Whenever ECU is replaced, ensure that the input and output signal circuits are normal.

COMMENTS ON TROUBLE SYMPTOM
The lighting control sensor, the harness connector, or the ETACS-ECU may be defective.

PROBABLE CAUSES

  • Malfunction of the lighting control sensor
  • Malfunction of the ETACS-ECU
  • Damaged wiring harness and connectors

DIAGNOSIS PROCEDURE

STEP 1. Lighting control sensor installation surface check.
Visually check the presence of scratches or air bubbles (diameter of 5 mm or more) on the windshield to which the lighting control sensor is installed.

Q. Is the check result normal?
Go to Step 2.
Replace the windshield (Refer to GROUP 42A - Windshield ).

STEP 2. Windshield wiper operation check.
Check that the windshield wipers work normally.

Q. Is the check result normal?
Go to Step 3.
Refer to trouble symptom chart .

STEP 3. M.U.T.-III diagnosis code.
Check if an ETACS-related diagnosis code is set.

Q. Is the diagnosis code set?
Diagnose the ETACS-ECU (Refer to GROUP 54A - ETACS, Diagnosis Code Chart ).
Go to Step 4.

STEP 4. M.U.T.-III diagnosis code.
Check if a lighting control sensor-related diagnosis code is set.

Q. Is the diagnosis code set?
Diagnose the lighting control sensor (Refer to GROUP 54A - Headlamp, Diagnosis Code Chart ).
Go to Step 5.

STEP 5. M.U.T.-III diagnosis code.
Check if diagnosis code is set in the LIN.

Q. Is the diagnosis code set?
Diagnose the LIN (Refer to GROUP 54B - Diagnosis Code Chart ).
Intermittent malfunction (Refer to GROUP 00 - How to Use Troubleshooting/Inspection Service Points - How to Cope with Intermittent Malfunction .)