Inspection Procedure 4

INSPECTION PROCEDURE 4: Windshield Wipers do not work normally.

Windshield Wiper Motor Drive Circuit:

TECHNICAL DESCRIPTION (COMMENT)
If either of the windshield wiper switch positions is defective, the windshield wiper motor, column switch (windshield wiper and washer switch) or the ETACS-ECU may be defective.

TROUBLESHOOTING HINTS
- Trouble in input signal system
- The wiring harness or connectors may have loose, corroded, or damaged terminals, or terminals pushed back in the connector
- The wiper motor 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.Use the scan tool MB991958 to check if an ETACS-related diagnostic trouble code is set.






Connect the scan tool. Refer to "How to connect the scan tool (M.U.T-III)."

Q: Is the diagnostic trouble code set?

YES : Diagnose the ETACS-ECU. Refer to Diagnostic trouble code chart."

NO : Go to Step 2.

STEP 2.Check the input signal related to the windshield wiper operation.

- Ignition switch: ACC






OK: Normal condition is displayed.

Q: Is the check result normal?

NO : Go to Step 3.

YES : Refer to Chassis Electrical - ETACS, Input signal chart.

STEP 3.Check windshield wiper motor connector A-04 for loose, corroded or damaged terminals, or terminals pushed back in the connector.

Q: Is windshield wiper motor connector A-04 in good condition?

YES : Go to Step 4.

NO : Repair or replace the damaged component(s). Refer to General (Electrical), Harness Connector Inspection.Verify that the windshield wiper operates normally when the windshield wiper switch is moved to each position.

STEP 4.Check the windshield wiper motor.

1. Disconnect windshield wiper motor connector A-04.






2. Connect a battery to the windshield wiper motor as shown. Then check if the windshield wiper motor operates normally at high and low speeds.

Q: Does the windshield wiper motor operate normally?

YES : Go to Step 5.

NO : Replace the windshield wiper motor. Verify that the windshield wiper operates normally when the windshield wiper switch is moved to each position.

STEP 5.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 6.

NO : Repair or replace the damaged component(s). Refer to General (Electrical), Harness Connector Inspection.Verify that the windshield wiper operates normally when the windshield wiper switch is moved to each position.

STEP 6.Check the wiring harness between windshield wiper motor connector A-04 (terminals 4 and 1) and ETACS-ECU connector C-304 (terminals 5 and 6).

Q: Is the wiring harness between windshield wiper motor connector A-04 (terminals 4 and 1) and ETACS-ECU connector C-304 (terminals 5 and 6) in good condition?

YES : No action is necessary and testing is complete.

NO : The wiring harness may be damaged or the connector(s) may have loose, corroded or damaged terminals, or terminals pushed back in the connector. Repair the wiring harness as necessary. Verify that the windshield wiper operates normally when the windshield wiper switch is moved to each position.