INSPECTION PROCEDURE 1: 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 A-22X wiper deicer relay connector

Q. Is the check result normal?
Go to Step 3.
Repair the connector concerned.

STEP 3. Check the wiper deicer relay

Q. Is the check result normal?
Go to Step 4.
Repair the wiper deicer relay concerned.

STEP 4. Check the A-07 wiper deicer relay connector

Q. Is the check result normal?
Go to Step 5.
Repair the wiper deicer relay concerned.

STEP 5. Check the wiper deicer


Check that the wiper deicer works normally (Refer to ).

Q. Is the check result normal?
Go to Step 6.
Replace the wiper deicer (windshield). (Refer to GROUP 42 - windshield glass ).

STEP 6. Measure the resistance at the A-22X wiper deicer relay connector.
(1)Disconnect the connector, and measure the resistance at the relay box.
(2)Measure the resistance between A-22X wiper deicer relay connector terminal No.2 and body earth.
OK: Continuity (2 Ω or less)

Q. Is the check result normal?
Go to Step 8.
Go to Step 7.

STEP 7. Check the wiring harness between A-22X wiper deicer relay connector terminal No. 2 and body earth.

  • Check the earth wires for open circuit.

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 voltage at the A-22X wiper deicer relay connector
(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 A-22X wiper deicer relay connector terminal No.1 and body earth.
OK: Battery voltage

Q. Is the check result normal?
Go to Step 10.
Go to Step 9.

STEP 9. Check the wiring harness between A-22X wiper deicer relay connector terminal No. 2 and C-306 rear window defogger relay connector terminal No.3.
note Prior to the wiring harness inspection, check intermediate connector C-37 and repair if necessary.

  • Check the power supply line for open or short circuit.

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 resistance at the A-07 wiper deicer connector.
(1)Disconnect the connector, and measure the resistance at the relay box.
(2)Measure the resistance between A-07 wiper deicer relay connector terminal No.2 and body earth.
OK: Continuity(2 Ω or less)

Q. Is the check result normal?
Go to Step 12.
Go to Step 11.

STEP 11. Check the wiring harness between A-07 wiper deicer connector terminal No. 2 and body earth.

  • Check the earth wires for open circuit.

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 12. Measure the voltage at the A-22X wiper deicer relay connector.
(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 A-22X wiper deicer relay connector terminal No.4 and body earth.
OK: Battery voltage

Q. Is the check result normal?
Go to Step 10.
Go to Step 13.

STEP 13. Check the wiring harness between A-22X wiper deicer relay connector terminal No. 4 and fusible link (34).

  • Check the power supply line for open circuit.

Q. Is the check result normal?
Go to Step 14.
Repair the wiring harness.

STEP 14. Check the wiring harness between A-07 wiper deicer connector terminal No. 1 and A-22X wiper deicer relay connector terminal No.3.

  • Check the power supply line for open or short circuit.

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.