Inspection Procedure 4: The windshield wipers do not work normally.
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Whenever the ECU is replaced, ensure that the input and output signal circuits are normal.
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COMMENTS ON TROUBLE SYMPTOM
The windshield wiper motor, the column switch or ETACS-ECU may be defective.
PROBABLE CAUSES
- Malfunction of the windshield wiper motor
- Malfunction of the column switch
- Malfunction of the ETACS-ECU
- Damaged harness wires and connectors
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STEP 1. 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 (Refer to GROUP 54A - ETACS, Diagnosis Code Chart  ).
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 Go to Step 2.
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STEP 2. M.U.T.-III data list.
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Check the input signal related to the windshield wiper operation.
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(2)Operate the windshield wiper switch at LO position.
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Item No.
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Item name
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Normal conditions
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65
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Front wiper output
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ON
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OK: Normal condition is displayed.
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(3)Operate the windshield wiper switch at HI position.
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Item No.
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Item name
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Normal conditions
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66
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Front wiper HI output
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ON
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OK: Normal condition is displayed.
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Q.
Is the check result normal?
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Go to Step 3.
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Troubleshoot the ETACS-ECU. Refer to GROUP 54A - ETACS, Inspection Procedure 9 "The column switch signal is not received." .
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STEP 3. Check the windshield wiper motor.
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Check that the windshield wiper motor works normally (Refer to ).
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Q.
Is the check result normal?
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Go to Step 4.
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Replace the windshield wiper motor and wiper link assembly (Refer to ).
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STEP 4. Check that the windshield wipers work.
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Check that the windshield wipers work at high speed and the mist mode.
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Q.
Is the check result normal?
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Go to Step 5.
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Go to Step 7.
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STEP 5. Measure the voltage at windshield wiper motor connector terminal where F/WIP-LO line is connected.
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(1)Disconnect the connector, and measure the voltage at the wiring harness side.
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(3)Windshield wiper switch: LO
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(4)Measure the voltage between the windshield wiper motor connector terminal where F/WIP-LO line is connected and the body earth.
OK: System voltage
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Q.
Is the check result normal?
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The trouble can be an intermittent malfunction (Refer to GROUP 00 - How to Use Troubleshooting/inspection Service Points - How to Cope with Intermittent Malfunction ).
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Go to Step 6.
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STEP 6.Check of open, short circuit in F/WIP-LO line between windshield wiper motor connector and ETACS-ECU connector.
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Q.
Is the check result normal?
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Go to Step 9.
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Repair the connector(s) or wiring harness.
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STEP 7. Measure the voltage at windshield wiper motor connector terminal where F/WIP-HI line is connected.
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(1)Disconnect the connector, and measure the voltage at the wiring harness side.
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(3)Windshield wiper switch: HI, MIST
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(4)Measure the voltage between the windshield wiper motor connector terminal where F/WIP-HI line is connected and the body earth.
OK: System voltage
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Q.
Is the check result normal?
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The trouble can be an intermittent malfunction (Refer to GROUP 00 - How to Use Troubleshooting/inspection Service Points - How to Cope with Intermittent Malfunction ).
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Go to Step 8.
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STEP 8. Check of open, short circuit in F/WIP-HI line between windshield wiper motor connector and ETACS-ECU connector.
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Q.
Is the check result normal?
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Go to Step 9.
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Repair the connector(s) or wiring harness.
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Check that the windshield wipers work normally by moving the switch to each position.
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Q.
Is the check result normal?
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The trouble can be an intermittent malfunction (Refer to GROUP 00 - How to Use Troubleshooting/inspection Service Points - How to Cope with Intermittent Malfunction ).
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Replace the ETACS-ECU (Refer to GROUP 54A - ETACS, ETACS-ECU ).
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