INSPECTION PROCEDURE: The wiper deicer does not work at all.

COMMENTS ON TROUBLE SYMPTOM

The wiper deicer should work for approximately 20 minutes when the rear defogger switch is turned on. If the wiper deicer does not work for the specified period, the defogger relay circuit (wiper deicer power supply circuit) may be defective. If the rear window defogger switch does not work normally, the rear window defogger relay (wiper deicer relay) may be defective.

PROBABLE CAUSES

Defective wiper deicer
Defective wiper deicer relay
Malfunctions of the wiring harness and connectors

DIAGNOSTIC PROCEDURE

STEP 1. Check the rear window defogger

Check that the rear window defogger works normally (Refer to GROUP 54A - Printed heater check

Q. Is the check result normal?

	Go to Step 2.

	Diagnose the rear window defogger (Refer to GROUP 55 - Check chart for trouble symptoms ).

STEP 2. Check the wiper deicer relay

Check that the wiper deicer relay works normally (Refer to

Q. Is the check result normal?

	Go to Step 3.

	Repair the wiper deicer relay concerned.

STEP 3. Check the wiper deicer

Check that the wiper deicer works normally (Refer to

Q. Is the check result normal?

	Go to Step 4.

	Replace the wiper deicer (windshield). (Refer to GROUP 42A - windshield glass ).

STEP 4. Measure the resistance at wiper deicer relay connector (DEFR terminal).

(1)Disconnect the connector, and measure the resistance at the relay box.

(2)Measure the resistance between wiper deicer relay connector (DEFR terminal) and body earth.
OK: Continuity exists (2 Ω or less)

Q. Is the check result normal?

	Go to Step 6.

	Go to Step 5.

STEP 5. Check of open circuit in DEFR line between wiper deicer relay connector and body earth.

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 ).

	Repair the wiring harness.

STEP 6. Measure the voltage at wiper deicer relay connector (earth terminal).

(1)Ignition switch: ON.

(2)Rear window defogger switch: ON.

(3)Disconnect the connector, and measure the voltage at the relay box side.

(4)Measure the voltage between wiper deicer relay connector (earth terminal) and body earth.
OK: System voltage

Q. Is the check result normal?

	Go to Step 8.

	Go to Step 7.

STEP 7. Check of short to open circuit in DEFR line between wiper deicer relay connector and ETACS-ECU.

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 )

	Repair the wiring harness.

STEP 8. Measure the resistance at wiper deicer connector (earth terminal).

(1)Disconnect the connector, and measure the resistance at the relay box.

(2)Measure the resistance between wiper deicer connector (earth terminal) and body earth.
OK: Continuity exists (2 Ω or less)

Q. Is the check result normal?

	Go to Step 10.

	Go to Step 9.

STEP 9. Check of open circuit in body earth line between wiper deicer connector and body earth.

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.

	Repair the wiring harness.

STEP 10. Measure the voltage at wiper deicer relay connector (power supply terminal).

(1)Ignition switch: ON.

(2)Rear window defogger switch: ON.

(3)Disconnect the connector, and measure the voltage at the relay box side.

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

Q. Is the check result normal?

	Go to Step 12.

	Go to Step 11.

STEP 11. Check of the open circuit in power supply line between wiper deicer relay connector and fusible link.

Q. Is the check result normal?

	Go to Step 12.

	Repair the wiring harness.

STEP 12. Check of short to power supply and open circuit in power supply line between wiper deicer connector and wiper deicer relay connector.

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 ).

	Repair the wiring harness.