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Inspection Procedure F-4

Windshield Wiper and Washer: Windshield wipers does not stop at the predetermined park position.

Windshield Wiper Motor Automatic Stop Relay Circuit:






TECHNICAL DESCRIPTION (COMMENT)
If the windshield wiper does not stop at predetermined park position, the windshield wiper motor or the front-ECU may be defective.

TROUBLESHOOTING HINTS
- The windshield wiper motor may be defective
- The front-ECU may be defective
- The wiring harness or connectors may have loose, corroded, or damaged terminals, or terminals pushed back in the connector

DIAGNOSIS

Required Special Tool:
- MB991223: Harness Set




STEP 1. Check the windshield wiper motor.

1. Disconnect windshield wiper motor connector A-02.
2. Connect the vehicle battery to the windshield wiper motor connector as shown, and operate the windshield wiper at low speed. While the windshield wiper is working, disconnect the battery at positions other than the predetermined park position to stop the windshield wiper motor.
3. When the battery is connected as shown, the motor should run at low speed, and then stop at the predetermined park position.

Q: Does the windshield wiper motor operate normally?

YES: Go to Step 2.

NO: Replace the windshield wiper motor. The windshield wiper should now stop at the predetermined park position.




STEP 2. Measure at windshield wiper motor connector A-02 to check the ignition switch (ACC) line of the power supply to the windshield wiper motor.

1. Disconnect windshield wiper motor connector A-02, and measure at the wiring harness side.
2. Turn the ignition switch to the "ACC" position.

3. Measure the voltage between terminal 2 and ground.
- The voltage should measure approximately 12 volts (battery positive voltage).

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

YES: Go to Step 5.

NO: Go to Step 3.




STEP 3. Check windshield wiper motor connector A-02 for loose, corroded or damaged terminals, or terminals pushed back in the connector.

Q: Is windshield wiper motor connector A-02 in good condition?

YES: Go to Step 4.

NO: Repair or replace the damaged component(s). Refer to Harness Connector Inspection. Verify that the windshield wiper works normally.













STEP 4. Check the wiring harness between windshield wiper motor connector A-02 and the ignition switch (ACC).

NOTE: Also check intermediate connectors C-12 and C-66 as well as junction block connectors C-87 and C-88 for loose, corroded, or damaged terminals, or terminals pushed back in the connector. If intermediate connector C-12, C-66, junction block connector C-87 or C-88 is damaged, repair or replace the damaged component(s) as described in Harness Connector Inspection.

Q: Is the wiring harness between windshield wiper motor connector A-02 and the ignition switch (ACC) 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 works normally.







STEP 5. Check windshield wiper motor connector A-02 and front-ECU connector A-11X for loose, corroded or damaged terminals, or terminals pushed back in the connector.

Q: Are windshield wiper motor connector A-02 and front-ECU connector A-11X in good condition?

YES: Go to Step 6.

NO: Repair or replace the damaged component(s). Refer to Harness Connector Inspection. The windshield wiper should stop at the predetermined park position.










STEP 6. Check the wiring harness between windshield wiper motor connector A-02 (terminal 3) and front-ECU connector A-11X (terminal 23).

NOTE: Also check intermediate connector C-05 for loose, corroded, or damaged terminals, or terminals pushed back in the connector. If intermediate connector C-05 is damaged, repair or replace the damaged component(s) as described in Harness Connector Inspection.

Q: Is the wiring harness between windshield wiper motor connector A-02 (terminal 3) and front-ECU connector A-11X (terminal 23) in good condition?

YES: Replace the front-ECU. The windshield wiper should stop at the predetermined park position.

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 works normally
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