Inspection Procedure C-3: The windshield wipers do not stop at the specified park position


caution Whenever the ECU is replaced, ensure that the input and output signal circuits are normal.


COMMENTS ON TROUBLE SYMPTOM


The windshield wiper motor or the ETACS-ECU may be defective.

PROBABLE CAUSES



DIAGNOSIS PROCEDURE

STEP 1. M.U.T.-III data list
Check if the ETACS-ECU receives the windshield wiper auto-stop signal.

  • Activate the windshield wipers.
Item No.
 Item name
 Normal condition
25
 Windshield wiper auto stop signal
 ON when the wipers are activated from the stopped state.
OK: Normal condition is displayed.

Q. Is the check result normal?
Go to Step 8.
Go to Step 2.

STEP 2. Connector check: A-03 windshield wiper motor connector


Q. Is the check result normal?

Go to Step 3.

Repair the connector.

STEP 3. Check the windshield wiper motor assembly.
Refer to GROUP 51 - Windshield wiper <LH drive vehicles> or <RH drive vehicles>.

Q. Is the check result normal?
Go to Step 4.
Replace the windshield wiper motor assembly.

STEP 4. Voltage measurement at the A-03 windshield wiper motor connector.


(1)Disconnect the connector, and measure at the wiring harness side.
(2)Ignition switch: ACC

(3)Check the voltage between the A-03 windshield wiper motor connector terminal No.2 and body earth.
OK: System voltage

Q. Is the check result normal?

Go to Step 6.

Go to Step 5.

STEP 5. Check the wiring harness between A-03 windshield wiper motor connector terminal No.2 and ignition switch (ACC).






note Prior to the wiring harness inspection, check the junction block connectors B-212, B-229, and repair if necessary.

  • Check the power supply line to ignition switch (ACC) for open circuit.

Q. Is the check result normal?

Perform troubleshooting for ignition switch. Refer to GROUP 54A - Ignition switch .

Repair the wiring harness.

STEP 6. Connector check: B-234 ETACS-ECU connector


Q. Is the check result normal?

Go to Step 7.

Repair the connector.

STEP 7. Check the wiring harness between A-03 windshield wiper motor connector terminal No.1 <LH drive vehicles>, No.3 <RH drive vehicles> and B-234 ETACS-ECU connector terminal No.6.






note Prior to the wiring harness inspection, check the junction block connector B-212, and repair if necessary.

  • Check the input signal lines for open circuit and short circuit.

Q. Is the check result normal?

Go to Step 8.

Repair the wiring harness.

STEP 8. Retest the system.
Check that the windshield wipers stop at the specified park position.

Q. Is the check result normal?
The trouble can be an intermittent malfunction (Refer to GROUP 00 - How to use Troubleshooting/inspection Service Points - How to Cope with Intermittent Malfunction ).
Replace the ETACS-ECU. Then perform the variant coding and write the VIN data (Refer to GROUP 00, Precautions Before Service - How to Perform Variant Coding ).