Inspection Procedure G-3

Windshield Wiper and Washer: Windshield Wiper Does Not Stop At the Predetermined Park Position

Windshield Wiper Motor Drive Circuit
- Refer to Inspection Procedure G-1.

CIRCUIT OPERATION
A signal from the windshield wiper switch is sent through the column-ECU inside the column switch to the front-ECU. The signal turns on the relay inside the front-ECU to operate the wiper motor.

TECHNICAL DESCRIPTION (COMMENT)
The wiper motor or the front-ECU may be defective.

TROUBLESHOOTING HINTS
- Malfunction of the 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 the wiper motor connector A-03.
2. Run the wiper motor at low-speed, disconnect the battery, and stop the motor.
3. Reconnect the battery as shown in the illustration, and confirm that after the motor starts turning at low-speed, and stops at the automatic stop position.

Q: Is the wiper motor in good condition?

YES: Go to Step 2.

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




STEP 2. Check the wiper motor power supply circuit at the wiper motor connector A-03 by back probing.
1. Do not disconnect the wiper motor connector A-03.
2. Turn the ignition switch to "ACC" position.
3. Measure the voltage between terminal 1 and ground by back probing.

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

YES: Go to Step 5.

NO: Go to Step 3.




STEP 3. Check wiper motor connector A-03 for damage.

Q: Is wiper motor connector A-03 in good condition?

YES: Go to Step 4.

NO: Repair or replace it. Refer to Harness Connector Inspection. The windshield wiper should stop at the predetermined park position.










STEP 4. Check the harness wires between wiper motor connector A-03 and ignition switch (ACC).

NOTE: After checking intermediate connector C-94 and junction block connectors C-101 and C-109, check the wires. If intermediate connector C-94 and junction block connectors C-101 and C-109 are damaged, repair or replace them. Refer to Harness Connector Inspection.

Q: Are the harness wires between wiper motor connector A-03 and Ignition switch (ACC) In good condition?

YES: There is no action to be taken.

NO: Repair or replace them. The windshield wiper should stop at the predetermined park position.







STEP 5. Check the wiper motor connector A-03 and front-ECU connector A-09X for damage.

Q: Are wiper motor connector A-03 and front-ECU connector A-09X in good condition?

YES: Go to Step 6.

NO: Repair or replace them. Refer to Harness Connector Inspection. The windshield wiper should stop at the predetermined park position.










STEP 6. Check the harness wires between wiper motor connector A-03 and front-ECU connector A-09X.

NOTE: After checking intermediate connector C-06, check the wires. If intermediate connector C-06 is damaged, repair or replace it. Refer to Harness Connector Inspection.

Q: Is the harness wires between wiper motor connector A-03 and front-ECU connector A-09X in good condition?

YES: There is no action to be taken.

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