Inspection Procedure G-4

INSPECTION PROCEDURE G-4: Windshield Wiper and Washer: Windshield wipers do not stop at the predetermined park position.


















TECHNICAL DESCRIPTION (COMMENT)

If the windshield wipers do not stop at predetermined park position, the windshield wiper motor or the front-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 windshield wiper motor may be defective
- The front-ECU may be defective

DIAGNOSIS

Required Special Tools:

- MB991223: Harness Set
- MB992006: Extra Fine Probe

STEP1. Check windshield wiper motor connector A-05 for loose, corroded or damaged terminals, or terminals pushed back in the connector.





Q. Is windshield wiper motor connector A-05 in good condition?

YES Go to Step 2.

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

STEP 2. Check the windshield wiper motor.





(1)Disconnect windshield wiper motor connector A-05.





(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 3.

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

STEP 3. Check the ignition switch (ACC) circuit to the windshield wiper motor. Measure the voltage at windshield wiper motor connector A-05.





(1)Disconnect windshield wiper motor connector A-05 and measure the voltage available at the wiring harness side of the connector.
(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 4.

STEP 4. Check the wiring harness between windshield wiper motor connector A-05 (terminal 2) and the ignition switch (ACC).

- Check the power supply line for open circuit and short circuit.









NOTE:
Also check intermediate connector C-24 for loose, corroded, or damaged terminals, or terminals pushed back in the connector. If intermediate connector C-24 is damaged, repair or replace the damaged component(s) as described in Harness Connector Inspection Harness Connector Inspection.

Q. Is the wiring harness between windshield wiper motor connector A-05 (terminal 2) and the ignition switch (ACC) in good condition?

YES Malfunction of the Ignition Switch Power Supply System.

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 front-ECU connector A-14X for loose, corroded or damaged terminals, or terminals pushed back in the connector.





Q. Is front-ECU connector A-14X in good condition?

YES Go to Step 6.

NO Repair or replace the damaged component(s). 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-05 (terminal 1) and front-ECU connector A-14X (terminal 29).

- Check the communication lines for open circuit and short circuit.









Q. Is the wiring harness between windshield wiper motor connector A-05 (terminal 1) and front-ECU connector A-14X (terminal 29) 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.