INSPECTION PROCEDURE 9: Sometimes the rain sensitive wiper function works even though these is no rainfall. <Optional: 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 may be defective or a failure in the lighting control sensor (rain sensor) adaptation is suspected.

PROBABLE CAUSES



  • Malfunction of the lighting control sensor

  • Lighting control sensor (rain sensor) adaptation failure

DIAGNOSTIC 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 42 - 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 Inspection procedure 3 .

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 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. Lighting control sensor (rain sensor) adaptation


Perform the lighting control sensor (rain sensor) adaptation. (Refer to Lighting Control Sensor (Rain Sensor) Adaptation ).

Q. Is the check result normal?

Intermittent malfunction (Refer to GROUP 00 - How to Use Troubleshooting/Inspection Service Points - How to Cope with Intermittent Malfunction ).
Go to Step 6.

STEP 6. System retest


Check that the rain sensitive wiper function works normally.

Q. Is the check result normal?

The inspection is complete.
Replace the lighting control sensor.