Inspection Procedure G-4

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

Windshield Wiper Automatic Stop Relay Circuit Part 1:

Windshield Wiper Automatic Stop Relay Circuit Part 2:

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 A-03.




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 stop at the predetermined park position.

STEP 2. Measure at windshield wiper motor connector A-03 to check the ignition switch (ACC) line of the power supply to the windshield wiper motor.




1. Disconnect windshield wiper motor connector A-03, and measure at the wiring harness side.
2. Turn the ignition switch to the "ACC" position.




3. Measure the voltage between terminal 1 and ground.
- 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 A-03 for damage.

Q: Is windshield wiper motor connector A-03 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 A-03 and the ignition switch (ACC).

NOTE: Also check intermediate connector C-94, junction block connectors C-111 and C-112. If intermediate connectors C-94 or junction block connector C-111 or C-112 is damaged, repair or replace the connector as described in Harness Connector Inspection.

Q: Is the wiring harness between windshield wiper motor connector A-03 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 A-03 and front-ECU connector A-11X for damage.

Q: Are windshield wiper motor connector A-03 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 A-03 (terminal 2) and front-ECU connector A-11X (terminal 23).

NOTE: Also check intermediate connector C-06. If intermediate connectors C-06 is damaged, repair or replace the connector as described in Harness Connector Inspection.

Q: Is the wiring harness between windshield wiper motor connector A-03 (terminal 2) 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: Repair the wiring harness. The windshield wiper should stop at the predetermined park position.