Inspection Procedure 4: The windshield wipers do not work normally.

caution

Whenever 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 ETACS-ECU may be defective.

PROBABLE CAUSES

Defective windshield wiper motor
Defective column switch (column-ECU)
Malfunction of ETACS-ECU
Malfunctions of the wiring harness and connectors

DIAGNOSTIC PROCEDURE

STEP 1. M.U.T.-III diagnosis code

Check if an ETACS-related diagnosis code is set.

Q. Is the diagnosis code set?

	Troubleshoot the ETACS. (Refer to GROUP 54A - ETACS, Trouble Symptom Chart .)

	Go to Step 2.

STEP 2. M.U.T.-III data list

Check the input signal related to the windshield wiper operation.

Turn the ignition switch to the ACC position.
Operate the windshield wiper switch at each switch position.

Item No.	Item name	Windshield wiper switch position	Normal condition
Item 235	Front wiper ACT	LO	ON
		HI	ON
		INTO	ON and OFF
		MIST	ON
Item 236	Front wiper Lo/Hi	LO	OFF
		HI	ON
		INTO	OFF
		MIST	ON

OK: Normal condition is displayed.

Q. Is the check result normal?

	YES <Normal conditions are displayed for all items> : Go to Step 3.

	NO <Normal condition is not displayed for item Nos. 235 and/or 236> : Troubleshoot the ETACS-ECU. Refer to ETACS, Diagnosis - Inspection Procedure 11 "Column switch signal is not received." .

STEP 3. Check that the windshield wipers work.

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

Q. Is the check result normal?

	Go to Step 4.

	Go to Step 8.

STEP 4. Check the windshield wiper motor.

Check that the windshield wiper motor works normally (Refer to

Q. Is the check result normal?

	Go to Step 5.

	Replace the windshield wiper motor.

STEP 5. Measure the voltage at windshield wiper motor connector.

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

(2)Ignition switch: ACC

(3)Windshield wiper switch: LO

(4)Measure the voltage between the windshield wiper motor connector power supply terminal and the body earth.
OK: System voltage

Q. Is the check result normal?

	Intermittent malfunction (Refer to GROUP 00 - How to Use Troubleshooting/Inspection Service Points - How to Cope with Intermittent Malfunction .)

	Go to Step 6.

STEP 6. Check of open, short circuit in W.LO line between windshield wiper motor connector and ETACS-ECU connector.

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?

	Intermittent malfunction (Refer to GROUP 00 - How to Use Troubleshooting/Inspection Service Points - How to Cope with Intermittent Malfunction ).

	Replace the ETACS-ECU.

STEP 8. Measure the voltage at windshield wiper motor connector.

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

(2)Ignition switch: ACC

(3)Windshield wiper switch: HI,MIST

(4)Measure the voltage between the windshield wiper motor connector power supply terminal and the body earth.
OK: System voltage

Q. Is the check result normal?

	Intermittent malfunction (Refer to GROUP 00 - How to Use Troubleshooting/Inspection Service Points - How to Cope with Intermittent Malfunction ).

	Go to Step 9.

STEP 9. Check of open, short circuit in W.HI line between windshield wiper motor connector and ETACS-ECU connector.

Q. Is the check result normal?

	Go to Step 10.

	Repair the connector(s) or 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?

	Intermittent malfunction (Refer to GROUP 00 - How to Use Troubleshooting/Inspection Service Points - How to Cope with Intermittent Malfunction ).

	Replace the ETACS-ECU.