Inspection Procedure 10: The windshield washer does not work.












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

COMMENTS ON TROUBLE SYMPTOM
The windshield washer motor, the column switch or the ETACS-ECU may be defective.

PROBABLE CAUSES

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

DIAGNOSIS PROCEDURE

STEP 1. Check the operation of the windshield wipers.
Check that the windshield wipers work normally.

Q. Is the check result normal?
Go to Step 2.
Refer to Inspection Procedure 1 "Windshield wipers do not work at all ."

STEP 2. 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 3.

STEP 3. M.U.T.-III data list
Check the input signal related to the windshield washer operation.

  • Ignition switch: ACC
  • Windshield washer switch: ON
Item No.
 Item name
 Normal condition
Item 237
 Front washer
 ON
OK: Normal condition is displayed.

Q. Is the check result normal?
Go to Step 4.
Refer to GROUP 54A - ETACS, Inspection Procedure 11 "The column switch signal is not received ."

STEP 4. Check the A-50 Washer motor connector

Q. Is the check result normal?
Go to Step 5.
Repair the defective connector.

STEP 5. Check the washer motor.
Check that the windshield washer motor works normally (Refer to ).

Q. Is the check result normal?
Go to Step 6.
Replace the washer 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. Measure the voltage at the C-304 ETACS-ECU connector.
(1)Disconnect the connector, and measure the voltage at the wiring harness-side.
(2)Ignition switch: ACC
(3)Windshield washer switch: ON
(4)Measure the voltage between C-304 ETACS-ECU connector terminal No. 13 and body earth.
OK: Battery voltage

Q. Is the check result normal?
Go to Step 10.
Go to Step 8.

STEP 8. Check the wiring harness between A-50 windshield washer motor connector terminal No. 2 and C-304 ETACS-ECU connector terminal No. 13.

  • Check the input line for open or short circuit.

Q. Is the check result normal?
Go to Step 9.
Repair the wiring harness.

STEP 9. Check the wiring harness between A-50 windshield washer motor connector terminal No. 1 and C-304 ETACS-ECU connector terminal No. 14.

  • Check the input line for open or short circuit.

Q. Is the check result normal?
Go to Step 10.
Repair the wiring harness.

STEP 10. Retest the system.
Check that the windshield washers work normally.

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.