Inspection Procedure G-4

Windshield Wiper and Washer: The windshield wipers 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
- 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 windshield wiper motor may be defective
- The front-ECU may be defective

DIAGNOSIS

Required Special Tool:
- MB991223: Harness Set
- MB992006: Extra Fine Probe




STEP 1. Check windshield wiper motor connector B-01 for loose, corroded or damaged terminals, or terminals pushed back in the connector.

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

YES: Go to Step 2.

NO: Repair or replace the damaged components). Refer to Harness Connector Inspection. Verify that the windshield wiper should now work normally.

STEP 2. Check the windshield wiper motor.




1. Disconnect windshield wiper motor connector B-01.
2. Connect a battery 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 3.

NO: Replace the windshield wiper motor (Refer to Windshield wiper). Verify that the windshield wiper should stop at the predetermined park position.

STEP 3. Check the battery power supply circuit to the windshield wiper motor. Measure the voltage at the windshield wiper motor connector B-01.




1. Disconnect windshield wiper motor connector B-01 and measure the voltage available at the component side of the connector.
2. Turn the ignition switch to the "ACC" position.




3. Measure the voltage between terminal 4 and ground.
- The voltage should equal 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 B-01 (terminal 4) and the ignition switch (ACC).

NOTE: Also check intermediate connector C-123, junction block connectors C-210 and C-211 for loose, corroded, or damaged terminals, or terminals pushed back in the connector. If intermediate connectors C-123 or junction block connector C-210 or C-211 is damaged, repair or replace the damaged components) as described in Harness Connector Inspection.

Q: Is the wiring harness between windshield wiper motor connector B-01 (terminal 4) 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 stops at the predetermined park position.




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

Q: Is front-ECU connector A-11X in good condition?

YES: Go to Step 6.

NO: Repair or replace the damaged components). Refer to Harness Connector Inspection. Verify that the windshield wiper should stop at the predetermined park position.










STEP 6. Check the wiring harness between windshield wiper motor connector B-01 (terminal 3) and front-ECU connector A-11X (terminal 23).

NOTE: Also check intermediate connector A-13 for loose, corroded, or damaged terminals, or terminals pushed back in the connector. If intermediate connectors A-13 is damaged, repair or replace the damaged components) as described in Harness Connector Inspection.

Q: Is the wiring harness between windshield wiper motor connector B-01 (terminal 3) and front-ECU connector A-11X (terminal 23) in good condition?

YES: Replace the front-ECU.

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.