Inspection Procedure 8: The rain sensitive AUTO wiper function does not work at all <Vehicles with lighting control sensor>.
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Whenever ECU is replaced, ensure that the input and output signal circuits are normal.
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The raindrops sensitive wiper function automatically adjusts the wiping speed of windscreen wiper by detecting the rainfall through lighting control sensor when the ignition switch is in the ON position and the column switch is in the AUTO position.
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COMMENTS ON TROUBLE SYMPTOM
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The windshield wiper motor, the column switch, the lighting control sensor, the harness connector, or the ETACS-ECU may be defective.
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- Malfunction of the column switch
- Malfunction of the lighting control sensor
- Malfunction of the windshield wiper motor
- Malfunction of the ETACS-ECU
- Damaged wiring harness and connectors
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STEP 1. Lighting control sensor installation surface check
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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.
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Q.
Is the check result normal?
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 Go to Step 2.
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 Replace the windshield (Refer to GROUP 42A - Windshield  ).
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STEP 2. Windshield wiper operation check
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Check that the windshield wipers work normally.
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Q.
Is the check result normal?
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Go to Step 3.
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Refer to trouble symptom chart .
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STEP 3. M.U.T.-III diagnosis code
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Check if an ETACS-related diagnosis code is set.
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Q.
Is the diagnosis code set?
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Diagnose the ETACS-ECU (Refer to GROUP 54A - ETACS, Diagnosis Code Chart ).
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Go to Step 4.
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STEP 4. M.U.T.-III diagnosis code
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Check if a lighting control sensor-related diagnosis code is set.
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Q.
Is the diagnosis code set?
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Diagnose the lighting control sensor (Refer to GROUP 54A - Headlamp, Diagnosis Code Chart ).
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Go to Step 5.
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STEP 5. Resistance measurement at the lighting control sensor connector (earth terminal).
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(1)Disconnect the connector, and measure the resistance at the wiring harness.
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(2)Measure the resistance between lighting control sensor connector (earth terminal) and body earth.
OK: Continuity exists (2 Ω or less)
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Q.
Is the check result normal?
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Go to Step 7.
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Go to Step 6.
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STEP 6. Check of open circuit in earth line between lighting control sensor connector and body earth.
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Q.
Is the check result normal?
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Intermittent malfunction (Refer to GROUP 00 - How to Use Troubleshooting/Inspection Service Points - How to Cope with Intermittent Malfunction .)
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Repair the connector(s) or wiring harness.
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STEP 7. Voltage measurement at the lighting control sensor connector (power supply terminal)
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(1)Disconnect the connector, and measure the voltage at the wiring harness side.
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(2)Measure the voltage between lighting control sensor connector (power supply terminal) and body earth.
OK: System voltage
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Q.
Is the check result normal?
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Go to Step 9.
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Go to Step 8.
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STEP 8. Check of short to power supply, short to earth, and open circuit in power supply line between lighting control sensor connector and fusible link.
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Q.
Is the check result normal?
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Intermittent malfunction (Refer to GROUP 00 - How to Use Troubleshooting/Inspection Service Points - How to Cope with Intermittent Malfunction .)
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Repair the connector(s) or wiring harness.
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STEP 9. M.U.T.-III diagnosis code.
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Check if diagnosis code is set in the LIN.
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Q.
Is the diagnosis code set?
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Diagnose the LIN (Refer to GROUP 54B - Diagnosis Code Chart ).
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Intermittent malfunction (Refer to GROUP 00 - How to Use Troubleshooting/Inspection Service Points - How to Cope with Intermittent Malfunction .)
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