Inspection Procedure 2: The Windshield Wipers do not Work Normally.


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. M.U.T.-III data list
Check the input signals below which are related to the windshield wiper.
(1)Turn the ignition switch to the "ON" position.
(2)Operate the windshield wiper switch.
Item No.
 Item name
 Normal condition
65
 Front wiper output
 Turns ON when each switch is operated.
66
 Front wiper HI output
OK: Normal conditions are displayed for all the functions of the switch.

Q. Is the check result normal?
Go to Step 3.
Refer to GROUP 54A, Inspection Procedure C-1 "The column switch (lighting and wiper switch) signal is not received ."

STEP 3. Connector check: A-05 windshield wiper motor connector


Q. Is the check result normal?

Go to Step 4.

Repair the defective connector.

STEP 4. Check the windshield wiper motor assembly.
Refer to .

Q. Is the check result normal?
Go to Step 5.
Replace the windshield wiper motor assembly.

STEP 5. Retest the system.
Check that the windshield wipers work normally by moving the switch to HI or MIST position.

Q. Is the check result normal?
Go to Step 6.
Go to Step 10.

STEP 6. Connector check: C-218 ETACS-ECU connector


Q. Is the check result normal?

YES <LH drive vehicles> : Go to Step 7.

YES <RH drive vehicles> : Go to Step 8.

Repair the defective connector.

STEP 7. Check the wiring harness between C-218 ETACS-ECU connector terminal No.8 and A-05 windshield wiper motor connector terminal No.3.






note Prior to the wiring harness inspection, check the junction block connector C-210 and repair if necessary.

  • Check the output lines for open circuit.

Q. Is the check result normal?

Go to Step 9.

Repair the wiring harness.

STEP 8. Check the wiring harness between C-218 ETACS-ECU connector terminal No.8 and A-05 windshield wiper motor connector terminal No.1.






note Prior to the wiring harness inspection, check the junction block connector C-210 and repair if necessary.

  • Check the output lines for open circuit.

Q. Is the check result normal?

Go to Step 9.

Repair the wiring harness.

STEP 9. Retest the system.
Check that the windshield wipers work normally by moving the switch to each 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 windshield wiper motor.

STEP 10. Connector check: C-218 ETACS-ECU connector




Q. Is the check result normal?

YES <LH drive vehicles> : Go to Step 11.

YES <RH drive vehicles> : Go to Step 12.

Repair the defective connector.

STEP 11. Check the wiring harness between C-218 ETACS-ECU connector terminal No.7 and A-05 windshield wiper motor connector terminal No.5.



note Prior to the wiring harness inspection, check the junction block connector C-210 and repair if necessary.

  • Check the output lines for open circuit.

Q. Is the check result normal?

Go to Step 13.

Repair the wiring harness.

STEP 12. Check the wiring harness between C-218 ETACS-ECU connector terminal No.7 and A-05 windshield wiper motor connector terminal No.4.



note Prior to the wiring harness inspection, check the junction block connector C-210 and repair if necessary.

  • Check the output lines for open circuit.

Q. Is the check result normal?

Go to Step 13.

Repair the wiring harness.

STEP 13. Retest the system.
Check that the windshield wipers work normally by moving the switch to each 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 windshield wiper motor.