INSPECTION PROCEDURE
4: The windshield wipers do not work normally.
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Whenever ECU is replaced, ensure that the input and output
signal circuits are normal.
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COMMENTS ON TROUBLE SYMPTOM
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The windshield wiper motor, the column switch or the ETACS-ECU may be defective.
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- Defective windshield wiper motor
- Defective column switch
- Malfunction of ETACS-ECU
- Malfunctions of the wiring harness 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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 Troubleshoot the ETACS. Refer to GROUP 54A - ETACS .
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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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- Ignition switch: ACC
- Operate the windshield wiper switch.
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Item No.
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Item name
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Normal conditions
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Item 235
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Front wiper ACT
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ON
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Item 236
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Front wiper Lo/Hi
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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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Refer to GROUP 54A - ETACS, Inspection Procedure 12 "The column switch
signal is not received ."
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STEP 3. 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 4.
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Go to Step 9.
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STEP 4. Check the A-09 windshield wiper motor connector
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Q.
Is the check result normal?
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Repair the connector concerned.
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STEP 5. 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 6.
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Replace the windshield wiper motor.
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STEP 6. Check the C-304 ETACS-ECU connector
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Q.
Is the check result normal?
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Go to Step 7.
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Repair the connector concerned.
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STEP 7. Check the wiring harness wires between C-304 ETACS-ECU connector
terminal No. 6 and A-09 windshield wiper motor connector terminal Nos.4 <LHD> or 3 <RHD>.
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- Check the output lines for open or short circuit.
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Q.
Is the check result normal?
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Go to Step 8.
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Repair the wiring harness.
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STEP 8. Retest the system.
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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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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.
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STEP 9. Check the A-09 windshield wiper motor connector
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Q.
Is the check result normal?
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Repair the connector concerned.
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STEP 10. 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 11.
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Replace the windshield wiper motor.
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STEP 11. Measure the voltage at the A-09 windshield wiper motor connector.
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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
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(4)Measure the voltage between A-09 windshield wiper motor connector terminal Nos.1 <LHD>
or 5 <RHD> and body earth.
OK: Battery voltage
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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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Go to Step 12.
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STEP 12. Check the C-304 ETACS-ECU connector
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Q.
Is the check result normal?
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Go to Step 13.
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Repair the connector concerned.
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STEP 13. Check the wiring harness wires between C-304 ETACS-ECU connector
terminal No. 5 and A-09 windshield wiper motor connector terminal Nos.1 <LHD> or 5 <RHD>.
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- Check the output lines for open or short circuit.
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Q.
Is the check result normal?
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Go to Step 14.
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Repair the wiring harness.
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STEP 14. Retest the system.
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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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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.
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