Step 1. Pulse check

Check the input signals below which are related to the windshield wiper.

System switch	Check condition
Ignition switch (ACC)	When turned from the LOCK (OFF) position to the ACC position.
Windshield mist wiper switch	When the switch is turned from off to on.
Windshield intermittent wiper switch	When the switch is turned from off to on.
Windshield low-speed wiper switch	When the switch is turned from off to on.
Windshield high-speed wiper switch	When the switch is turned from off to on.

OK: The MUT-II/III sounds or the voltmeter needle fluctuates.

Q: Is the check result normal?

All the signals are received normally:  Go to Step 2.
The ignition switch (ACC) signal is not received.:  Refer to Inspection Procedure P-1 "The ignition switch (ACC) signal is not received ."
Windshield mist wiper switch signal is not received.:  Refer to Inspection Procedure P-6 "The column switch (windshield wiper/washer and rear wiper/washer switch) signal is not received ."
Windshield intermittent wiper switch signal is not received.:  Refer to Inspection Procedure P-6 "The column switch (windshield wiper/washer and rear wiper/washer switch) signal is not received ."
Windshield low-speed wiper switch signal is not received.:  Refer to Inspection Procedure P-6 "The column switch (windshield wiper/washer and rear wiper/washer switch) signal is not received ."
Windshield high-speed wiper switch signal is not received.:  Refer to Inspection Procedure P-6 "The column switch (windshield wiper/washer and rear wiper/washer switch) signal is not received ."

Step 2. Check the operation of the windshield wipers.

Check that the windshield wipers work at high speed and the mist mode.

Q: Is the check result normal?

YES:  Go to Step 3.
NO:  Go to Step 9.

Step 3. Connector check: B-07 windshield wiper motor connector

Q: Is the check result normal?

YES:  Go to Step 4.
NO:  Repair the defective connector.

Step 4. Measure the voltage at the B-07 windshield wiper motor connector.

1. Disconnect the connector, and measure at the wiring harness side.

2. Ignition switch: ON

3. Windshield wiper switch: LO

4. Check the voltage between the B-07 windshield wiper motor connector terminal No.3 <RH drive vehicles> or No.4 <LH drive vehicles> and body earth.
OK: Battery positive voltage

Q: Is the check result normal?

YES:  Go to Step 5.
NO:  Go to Step 6.

Step 5. Retest the system.

Check that the windshield wipers work normally by moving the switch to each position.

Q: Is the check result normal?

YES:  The trouble can be an intermittent malfunction (Refer to GROUP 00 - How to Cope with Intermittent Malfunction ).
NO:  Replace the windshield wiper motor.

Step 6. Connector check: A-12X front-ECU connector

Q: Is the check result normal?

YES:  Go to Step 7.
NO:  Repair the defective connector.

Step 7. Check the wiring harness between B-07 windshield wiper motor connector terminal No.4 and body earth.

NOTE: Prior to the wiring harness inspection, check the intermediate connector A-14, and repair if necessary.

• Check the power supply line to front-ECU for open circuit.

Q: Is the check result normal?

YES:  Go to Step 8.
NO:  Replace the front-ECU.

Step 8. Retest the system.

Check that the windshield wipers work normally by moving the switch to each position.

Q: Is the check result normal?

YES:  The trouble can be an intermittent malfunction (Refer to GROUP 00 - How to Cope with Intermittent Malfunction ).
NO:  Replace the windshield wiper motor.

Step 9. Connector check: B-07 windshield wiper motor connector

Q: Is the check result normal?

YES:  Go to Step 10.
NO:  Repair the defective connector.

Step 10. Measure the voltage at the B-07 windshield wiper motor connector.

1. Disconnect the connector, and measure at the wiring harness side.

2. Ignition switch: ON

3. Windshield wiper switch: HI

4. Check the voltage between the B-07 windshield wiper motor connector terminal No.5 <RH drive vehicles> or No.1 <LH drive vehicles> and body earth.
OK: Battery positive voltage

Q: Is the check result normal?

YES:  Go to Step 11.
NO:  Go to Step 12.

Step 11. Retest the system.

Check that the windshield wipers work normally by moving the switch to each position.

Q: Is the check result normal?

YES:  The trouble can be an intermittent malfunction (Refer to GROUP 00 - How to Cope with Intermittent Malfunction ).
NO:  Replace the windshield wiper motor.

Step 12. Connector check: A-12X front-ECU connector

Q: Is the check result normal?

YES:  Go to Step 13.
NO:  Repair the defective connector.

Step 13. Check the wiring harness between B-07 windshield wiper motor connector terminal No.4 and body earth.

NOTE: Prior to the wiring harness inspection, check the intermediate connector A-14, and repair if necessary.

• Check the power supply line to front-ECU for open circuit.

Q: Is the check result normal?

YES:  Go to Step 14.
NO:  Replace the front-ECU.

Step 14. Retest the system.

Check that the windshield wipers work normally by moving the switch to each position.

Q: Is the check result normal?

YES:  The trouble can be an intermittent malfunction (Refer to GROUP 00 - How to Cope with Intermittent Malfunction ).
NO:  Replace the windshield wiper motor.