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 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 Removal and Installation ).

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 .

	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 - 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?

	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 .)