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When the column switch is in the AUTO position, this function automatically adjusts the wiping speed of windshield wiper by detecting the rain fall through lighting control sensor.
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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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- Defective column switch (column-ECU)
- Malfunction of the lighting control sensor
- Defective windshield wiper motor
- Malfunction of FRONT-ECU
- Malfunction of CAN converter-ECU
- Damaged wiring harness and connectors
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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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 Replace the windshield (Refer to GROUP 42 - Windshield Removal and Installation  ).
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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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Refer to trouble symptom chart .
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Check if CAN converter-ECU-related diagnosis code is set.
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Q.
Is the diagnosis code set?
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 Diagnose the CAN converter-ECU. Refer to GROUP 54A - Headlamp Diagnosis Code Chart .
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Check if a lighting control sensor 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 - Diagnosis Code Chart .)
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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 .
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Check the input signals below which are related to the windshield wiper.
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OK: The M.U.T.-III sounds or the voltmeter needle fluctuates.
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Q.
Are the check result normal?
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All the signals are received normally : Go to Step 7.
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Windshield AUTO wiper switch signal is not received. : Refer to GROUP 54A - ETACS, Inspection procedure C-7 "The column switch (windshield wiper washer and rear wiper washer switch) signal is not received ."
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Q.
Is the check result normal?
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Repair the damaged connector.
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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 E-136 lighting control sensor connector terminal No.2 and body earth.
OK: Continuity exists (2 Ω or less)
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Q.
Is the check result normal?
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- Check the earth wires for open circuit.
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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 wiring harness.
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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 E-136 lighting control sensor connector terminal No.1 and body earth.
OK: System voltage
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Q.
Is the check result normal?
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- Check the power supply line for open circuit.
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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 wiring harness.
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Q.
Is the check result normal?
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Repair the damaged connector.
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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 D-252 CAN converter-ECU connector terminal No. 12 and body earth.
OK: System voltage
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Q.
Is the check result normal?
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Replace the Lighting control sensor.
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- Check the input and output lines for open or short circuit.
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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 wiring harness.
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