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 backprobing.
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 backprobing.

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-212 and junction block connectors C-310 and C-301, check the wires. If intermediate connector C-212 and junction block connectors C-310 and C-301 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-05, check the wires. If intermediate connector C-05 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.