Inspection Procedure
1: Windshield wipers do not work at all.
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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 (column-ECU) or ETACS-ECU may be defective. Check
the wiper backup circuit (between the column switch WB/U and the ETACS-ECU WB/U), and repair if
necessary.
PROBABLE CAUSES
- Malfunction of the windshield wiper motor
- Defective column switch (column-ECU)
- The ETACS-ECU may be defective
- 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-ECU. (Refer to GROUP 54A -
ETACS, Trouble Symptom
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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- Set the ignition switch to the ACC position.
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Item No.
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Item name
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Normal conditions
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29
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Ignition Switch (ACC)
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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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GROUP 54A -
ETACS, Inspection Procedure 1 "The ignition switch (ACC)
signal is not received."? Refer to .
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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.
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STEP 4. Measure the resistance at windshield wiper motor 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 the windshield wiper motor connector earth terminal
and the 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 6.
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Go to Step 5.
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STEP 5. Check of open circuit in body earth lines between windshield
wiper motor 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 Malfunctions .)
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Repair the connector(s) or wiring harness.
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STEP 6. Measure the voltage at ETACS-ECU (ETACS +B).
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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 the ETACS-ECU (ETACS +B) and the body earth.
OK: System voltage
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Q.
Is the check result normal?
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Go to Step 8.
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Go to Step 7.
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STEP 7. Check of open in power supply line between fusible link and
ETACS-ECU (ETACS +B).
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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 Malfunctions .)
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Repair the connector(s) or wiring harness.
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STEP 8.Check of open, short circuit in F/WIP-LO, 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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STEP 9. Check the trouble symptom.
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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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Intermittent malfunction. Refer to GROUP 00 -
How to Use Troubleshooting/Inspection
Service Points, -
How to Cope with Intermittent Malfunctions .)
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Replace the ETACS-ECU (Refer to GROUP 54A -
ETACS, ETACS-ECU ).
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