INSPECTION PROCEDURE 4: The windshield wipers do not work normally.











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


COMMENTS ON TROUBLE SYMPTOM


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

PROBABLE CAUSES



  • Defective windshield wiper motor
  • Defective column switch
  • Malfunction of ETACS-ECU
  • Malfunctions of the wiring harness and connectors

DIAGNOSTIC PROCEDURE


STEP 1. M.U.T.-III diagnosis code


Check if an ETACS-related diagnosis code is set.

Q. Is the diagnosis code set?

Troubleshoot the ETACS. Refer to GROUP 54A - ETACS .
Go to Step 2.

STEP 2. M.U.T.-III data list


Check the input signal related to the windshield wiper operation.

  • Ignition switch: ACC
  • Operate the windshield wiper switch.
Item No.
Item name
Normal conditions
Item 235
Front wiper ACT
ON
Item 236
Front wiper Lo/Hi
ON
OK: Normal condition is displayed.

Q. Is the check result normal?

Go to Step 3.
Refer to GROUP 54A - ETACS, Inspection Procedure 12 "The column switch signal is not received ."

STEP 3. Check that the windshield wipers work.


Check that the windshield wipers work at high speed and the mist mode.

Q. Is the check result normal?

Go to Step 4.
Go to Step 9.

STEP 4. Check the A-09 windshield wiper motor connector


Q. Is the check result normal?


    Go to Step 5.
Repair the connector concerned.

STEP 5. Check the windshield wiper motor.


Check that the windshield wiper motor works normally (Refer to ).

Q. Is the check result normal?

Go to Step 6.
Replace the windshield wiper motor.

STEP 6. Check the C-304 ETACS-ECU connector


Q. Is the check result normal?

Go to Step 7.
Repair the connector concerned.

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>.



  • Check the output lines for open or 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 work normally by moving the switch to each position.

Q. Is the check result normal?

Intermittent malfunction (Refer to GROUP 00 - How to Use Troubleshooting/Inspection Service Points - How to Cope with Intermittent Malfunction ).
Replace the ETACS-ECU.

STEP 9. Check the A-09 windshield wiper motor connector


Q. Is the check result normal?


    Go to Step 10.
Repair the connector concerned.

STEP 10. Check the windshield wiper motor.


Check that the windshield wiper motor works normally (Refer to ).

Q. Is the check result normal?

Go to Step 11.
Replace the windshield wiper motor.

STEP 11. Measure the voltage at the A-09 windshield wiper motor connector.


(1)Disconnect the connector, and measure the voltage at the wiring harness side.
(2)Ignition switch: ACC
(3)Windshield wiper switch: HI
(4)Measure the voltage between A-09 windshield wiper motor connector terminal Nos.1 <LHD> or 5 <RHD> and body earth.
OK: Battery voltage

Q. Is the check result normal?

Intermittent malfunction (Refer to GROUP 00 - How to Use Troubleshooting/Inspection Service Points - How to Cope with Intermittent Malfunction ).
Go to Step 12.

STEP 12. Check the C-304 ETACS-ECU connector


Q. Is the check result normal?

Go to Step 13.
Repair the connector concerned.

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>.



  • Check the output lines for open or short circuit.

Q. Is the check result normal?

Go to Step 14.
Repair the wiring harness.

STEP 14. Retest the system.


Check that the windshield wipers work normally by moving the switch to each position.

Q. Is the check result normal?

Intermittent malfunction (Refer to GROUP 00 - How to Use Troubleshooting/Inspection Service Points - How to Cope with Intermittent Malfunction ).
Replace the ETACS-ECU.