Inspection Procedure G-4: The windshield wipers does not work normally.

caution

Whenever the ECU is replaced, ensure that the input and output signal circuits are normal.

COMMENTS ON TROUBLE SYMPTOM

The windshield wiper motor, the column switch or the front-ECU may be defective.

POSSIBLE CAUSES

Malfunction of the windshield wiper motor
Malfunction of the column switch
Malfunction of the front-ECU
Damaged harness wires and connectors

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 M.U.T.-III sounds or the voltmeter needle fluctuates.

Q. Are 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. Connector check: A-01 windshield wiper motor connector.

Q. Is the check result normal?

Go to Step 3.

Repair the defective connector.

Step 3. Check the windshield wiper motor assembly.

Refer to GROUP 51 - Windshield wiper

Q. Is the check result normal?

	Go to Step 4.

	Replace the windshield wiper motor assembly.

Step 4. Retest the system.

Check that the windshield wipers work normally by moving the switch to HI or MIST position.

Q. Is the check result normal?

	Go to Step 5.

	Go to Step 8.

Step 5. Connector check: A-15X front-ECU connector.

Q. Is the check result normal?

Go to Step 6.

Repair the defective connector.

Step 6. Check the wiring harness between A-15X front-ECU connector terminal No.27 to A-01 windshield wiper motor connector terminal No.1.

Check the output lines for open circuit.

Q. Is the check result normal?

Go to Step 7.

Repair the wiring harness.

Step 7. Retest the system.

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

Q. Is the check result normal?

	The trouble can be an intermittent malfunction (Refer to GROUP 00 - How to Cope with Intermittent Malfunction ).

	Replace the front-ECU.

Step 8. Connector check: A-15X front-ECU connector.

Q. Is the check result normal?

Go to Step 9.

Repair the defective connector.

Step 9. Check the wiring harness between A-15X front-ECU connector terminal No.28 to A-01 windshield wiper motor connector terminal No.4.

Check the output lines for open circuit.

Q. Is the check result normal?

Go to Step 10.

Repair the wiring harness.

Step 10. Retest the system.

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

Q. Is the check result normal?

	The trouble can be an intermittent malfunction (Refer to GROUP 00 - How to Cope with Intermittent Malfunction ).

	Replace the front-ECU.