INSPECTION PROCEDURE 14: Sometimes the rain sensitive AUTO wiper function works even though there is no rainfall <Vehicles with LDW camera (rain sensor)>.


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

COMMENTS ON TROUBLE SYMPTOM
The LDW-ECU (rain sensor) may be defective or a failure in the lighting control sensor (rain sensor) adaptation is suspected.

PROBABLE CAUSES

  • Malfunction of the LDW-ECU (rain sensor)

  • Lighting control sensor (rain sensor) adaptation failure

DIAGNOSTIC PROCEDURE

STEP 1. LDW camera (rain sensor) mounting 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. LDW camera (rain sensor) mounting surface check
Check that the LDW camera (rain sensor) is installed to the windshield glass correctly.

Q. Is the check result normal?
After the LDW camera (rain sensor) has been initialised (Refer to GROUP 54A - How to Initialise the LDW Camera (Rain Sensor) ), go to Step 3.
Install the LDW camera (rain sensor) to the windshield glass correctly (Refer to GROUP 54A - LDW Camera Removal and Installation ).

STEP 3. Windshield wiper operation check
Check that the windshield wipers work normally.

Q. Is the check result normal?
Go to Step 4.
Refer to trouble symptom chart .

STEP 4. 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 5.

STEP 5. M.U.T.-III diagnosis code
Check whether the LDW camera (rain sensor) diagnosis code is set.

Q. Is the diagnosis code set?
Diagnose the LDW camera (rain sensor). (Refer to GROUP 54A - Diagnosis Code Chart ).
Go to Step 6.

STEP 6. Retest the system.
After the LDW camera (rain sensor) has been initialised, check the LDW camera (rain sensor).
(1) Windshield glass surface should be dry.
(2) Pour water to the windshield glass surface where the LDW camera (rain sensor) is installed.

Q. Does the windshield wiper operate?
Operate : Intermittent malfunction (Refer to GROUP 00 - How to Use Troubleshooting/Inspection Service Points - How to Cope with Intermittent Malfunction ).
Does not operate : Troubleshoot the rain-sensitive wiper function (Refer to Inspection procedure 13 ).