Inspection Procedure 10

INSPECTION PROCEDURE 10: The windshield washer does not work normally.


















CIRCUIT OPERATION

The windshield washer switch sends a signal through the column-ECU (incorporated in the column switch) to the ETACS-ECU. If the column-ECU sends a windshield washer switch "ON" signal to the ETACS-ECU, the ETACS-ECU turns on the relay (incorporated in the ETACS-ECU), thus causing the washer motor to be turned on.

TECHNICAL DESCRIPTION (COMMENT)

If the windshield washer does not work normally, the washer motor, the column switch (windshield wiper and washer switch) or the ETACS-ECU may be defective.

TROUBLESHOOTING HINTS

- The wiring harness or connectors may have loose, corroded, or damaged terminals, or terminals pushed back in the connector
- The washer motor may be defective
- The column switch may be defective
- The ETACS-ECU may be defective

DIAGNOSIS

Required Special Tools:

- MB991223: Harness Set
- MB992006: Extra Fine Probe
- MB991958: Scan Tool (M.U.T.-III Sub Assembly)
- MB991824: V.C.I.
- MB991827: M.U.T.-III USB Cable
- MB991910: M.U.T.-III Main Harness A

STEP 1. Verify the windshield wiper operation.

Q. Does the windshield wiper operate normally?

YES Go to Step 2.
NO Refer to Inspection Procedure 1 "The windshield wipers do not work at all Inspection Procedure 1."
STEP 2. Use the scan tool MB991958 to check if an ETACS-related diagnostic trouble code is set.





Connect the scan tool. Reading and Clearing Diagnostic Trouble Codes."

Q. Is the diagnostic trouble code set?

YES Diagnose the ETACS-ECU. Electronic Time and Alarm Control System (ETACS)."

NO Go to Step 3.

STEP 3. Check the input signal related to the windshield washer operation.

- Ignition switch: ACC
- Windshield washer switch: ON





OK: Normal condition is displayed.


Q. Is the check result normal?

NO Go to Step 4.
YES Symptom Chart.
STEP 4. Check windshield washer motor connector D-20 for loose, corroded or damaged terminals, or terminals pushed back in the connector.

Q. Is windshield washer motor connector D-20 in good condition?

YES Go to Step 5.
NO Repair or replace the damaged component(s). Harness Connector Inspection. Verify that the windshield wiper works normally.
STEP 5. Check the operation of windshield washer motor.

(1)Disconnect windshield washer motor connector D-20 and check at windshield washer motor connector side.

(2)Fill the windshield washer tank with washer fluid.





(3)When battery voltage is applied between terminals 1 and 2, washer fluid should spray out.

Q. Does the washer motor operate normally?

YES Go to Step 6.

NO Replace the washer motor. Verify that the windshield washer works normally.

STEP 6. Check ETACS-ECU connector C-304 for loose, corroded or damaged terminals, or terminals pushed back in the connector.

Q. Is ETACS-ECU connector C-304 in good condition?

YES Go to Step 7.
NO Repair or replace the damaged component(s). Harness Connector Inspection. Verify that the windshield washer works normally.
STEP 7. Measure the voltage at ETACS-ECU connector C-304.

(1)Disconnect ETACS-ECU connector C-304 and measure the resistance available at the wiring harness side of the connector.

(2)Ignition switch: ACC

(3)windshield washer switch: ON





(4)(5)Measure the voltage between C-304 ETACS-ECU connector terminal No. 13 and body ground.
OK: Battery positive voltage

Q. Is the measured voltage approximately 12 volts (battery positive voltage)?

YES Go to Step 10.

NO Go to Step 8.

STEP 8. Check the wiring harness between windshield washer motor connector D-20 (terminal 2) and ETACS-ECU connector C-304 (terminal 13).

NOTE:
Prior to the wiring harness inspection, check intermediate connector C-47 and repair if necessary.

- Check the input lines for open or short circuit.

Q. Is the wiring harness between windshield washer motor connector D-20 (terminal 2) and ETACS-ECU connector C-304 (terminal 13)in good condition?

YES Go to Step 9.
NO Repair or replace the damaged component(s). Cable and Wire Check.
STEP 9. Check the wiring harness between windshield washer motor connector D-20 (terminal 1) and ETACS-ECU connector C-304 (terminal 14).

NOTE:
Prior to the wiring harness inspection, check intermediate connector C-47 and repair if necessary.

- Check the input lines for open or short circuit.

Q. Is the wiring harness between windshield washer motor connector D-20 (terminal 1) and ETACS-ECU connector C-304 (terminal 14)in good condition?

YES Go to Step 10.
NO Repair or replace the damaged component(s). Cable and Wire Check.
STEP 10. Retest the system.

Check that the windshield washers work normally.

Q. Is the check result normal?

YES Intermittent malfunction. How to Cope With Intermittent Malfunctions.
NO Replace the ETACS-ECU.