Inspection Procedure 1: The Windshield Wipers do not Work at All.


caution Whenever the 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



DIAGNOSIS PROCEDURE

STEP 1. M.U.T.-III diagnosis code.
When the ignition switch is turned to the "LOCK" (OFF) position, check that the ETACS-ECU does not set the diagnosis code.

Q. Is the diagnosis code set?
Refer to GROUP 54A, Diagnosis Code Chart .
Go to Step 2.

STEP 2. Check the power supply circuit.
When the ignition switch is turned to the LOCK (OFF) position, check if the hazard warning lamps illuminate.

Q. Is the check result normal?
Go to Step 3.
Refer to GROUP 54A, Inspection Procedure A-1 "Check The Battery Power Supply Circuit to The ETACS-ECU ."

STEP 3. M.U.T.-III data list
Check the input signals below which are related to the windshield wiper.

  • Turn the ignition switch to the "ACC" position.
Item No.
 Item name
 Normal condition
29
 Ignition switch(ACC)
 ON
OK: Normal condition is displayed.

Q. Is the check result normal?
Go to Step 4.
Refer to GROUP 54A, Inspection Procedure C-2 "The Ignition Switch (ACC) signal is not received ."

STEP 4. Connector check: A-05 windshield wiper motor connector


Q. Is the check result normal?

Go to Step 5.

Repair the connector.

STEP 5. Check the windshield wiper motor assembly.
Refer to .

Q. Is the check result normal?
Go to Step 6.
Replace the windshield wiper motor assembly.

STEP 6. Resistance measurement at the A-05 windshield wiper motor connector.


(1)Disconnect the connector, and measure at the wiring harness side.

(2)Continuity between A-05 windshield wiper motor connector terminal No.2 and body earth
OK: Continuity (Less than 2 Ω)

Q. Is the check result normal?

Go to Step 8.

Go to Step 7.

STEP 7. Check the wiring harness between A-05 windshield wiper motor connector terminal No.2 and body earth.



  • Check the earth wires for open circuit.

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 ).

Repair the wiring harness.

STEP 8. Connector check: C-219 ETACS-ECU connector, C-302 column switch connector




Q. Is the check result normal?

Go to Step 9.

Repair the connector.

STEP 9. Check the wiring harness between C-302 column switch connector terminal No.8 and C-219 ETACS-ECU connector terminal No.64.





  • Check the wiper backup circuit.

Q. Is the check result normal?

Go to Step 10.

Repair the wiring harness.

STEP 10. Retest the system.
The windshield wiper should now work normally at all.

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.