Inspection Procedure F-4

Windshield Wiper and Washer: Windshield Wiper does not Stop at the Predetermined Park Position

Windshield Wiper Automatic Stop Relay Circuit:

Connector:

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
- Malfunction of the windshield wiper motor
- Malfunction of the front-ECU
- Damaged harness wires and connectors

DIAGNOSIS

Required Special Tool:
- MB991223: Test Harness Set




STEP 1. Check the windshield wiper motor.

1. Disconnect windshield wiper motor connector B-01.
2. Connect a vehicle speed to operate the wipers at low speed. While the wipers are working, disconnect the battery at positions other than the predetermined park position to stop the 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 stop at the predetermined park position.




STEP 2. Measure at windshield wiper motor connector B-01 to check the ignition switch (ACC) line of the power supply to the windshield wiper motor.

1. Disconnect windshield wiper motor connector B-01, and measure at the harness side.
2. Turn the ignition switch to the "ACC" position.
3. Measure the voltage between terminal 4 and ground by backprobing.
- The measured value should be approximately 12 volts (battery positive voltage).

Q: Does the measured voltage correspond with this range?

YES: Go to Step 5.

NO: Go to Step 3.




STEP 3. Check windshield wiper motor connector B-01 for damage.

Q: Is windshield wiper motor connector B-01 in good condition?

YES: Go to Step 4.

NO: Repair or replace the connector. Refer to Harness Connector Inspection. Check that the windshield wiper works normally.










STEP 4. Check the wiring harness between windshield wiper motor connector B-01 and the ignition switch (ACC).

NOTE: Also check intermediate connector C-123, junction block connectors C-210 and C-211. If intermediate connectors C-123 or junction block connector C-210 or C-211 is damaged, repair or replace the connector as described in Harness Connector Inspection.

Q: Is the wiring harness between windshield wiper motor connector B-01 and the ignition switch (ACC) in good condition?

YES: No action to be taken.

NO: Repair the wiring harness. The windshield wiper should stop at the predetermined park position.







STEP 5. Check windshield wiper motor connector B-01 and front-ECU connector A-11X for damage.

Q: Are windshield wiper motor connector B-01 and front-ECU connector A-11X in good condition?

YES: Go to Step 6

NO: Repair or replace the connector. 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 B-01 and front-ECU connector A-11X.

NOTE: Also check intermediate connector A-13. If intermediate connectors A-13 is damaged, repair or replace the connector as described in Harness Connector Inspection.

Q: Is the wiring harness between windshield wiper motor connector B-01 and front-ECU connector A-11X in good condition?

YES: Replace the front-ECU.

NO: Repair the wiring harness. Replace the front-ECU.