Inspection Procedure 7: The rear window defogger does not work <Vehicles with rear panel power window >




COMMENTS ON TROUBLE SYMPTOM



PROBABLE CAUSES



  • Malfunction of the automatic A/C control panel (A/C-ECU)
  • Malfunction of the rear panel power window-ECU
  • Malfunction of the rear window defogger relay
  • Damaged the wiring harness or connectors
  • Malfunction of the rear window defogger

DIAGNOSIS PROCEDURE

STEP 1. Check the A/C operation.

Q. Do the A/C work normally?
Go to Step 2.
Refer to Inspection procedure 1 "Cool air does not come ."

STEP 2. Connector check: D-11 rear panel power window-ECU connector and D-08 rear window defogger connector



Q. Is the check result normal?

Go to Step 3.

Repair the connector.

STEP 3. Voltage measurement at D-08 rear window defogger connector.



(1)Disconnect the connector, and measure at the wiring harness side.
(2)Turn the ignition switch to the "ON" position.


(3)Disconnect rear panel power window-ECU connector D-11 and earth terminal 15.

(4)Measure the voltage between terminal 1 and body earth.
OK: System voltage

Q. Is the check result normal?

Go to Step 11.

Go to Step 4.

STEP 4. Check the rear window defogger relay continuity.
Refer to .

Q. Is the rear window defogger relay in good condition?
Go to Step 5.
Replace the rear window defogger relay.

STEP 5. Voltage measurement at C-217 rear window defogger relay connector.




(1)Remove the relay, and measure at the junction block side.

(2)Measure the voltage between terminal 4 and body earth.
OK: System voltage

Q. Is the check result normal?

Go to Step 7.

Go to Step 6.

STEP 6. Check the wiring harness between C-217 rear window defogger relay connector terminal No.4 and the fusible link (20).


note Prior to the wiring harness inspection, check junction block connector C-213, and repair if necessary.

  • Check the rear window defogger relay power supply line for open and short circuit.

Q. Is the check result normal?

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

Repair the wiring harness.

STEP 7. Voltage measurement at C-217 rear window defogger relay connector.




(1)Remove the relay, and measure at the junction block side.
(2)Turn the ignition switch to the "ON" earth position.

(3)Voltage between terminal 1 and body earth.
OK: System voltage

Q. Is the check result normal?

Go to Step 9.

Go to Step 8.

STEP 8. Check the wiring harness between C-217 rear window defogger relay connector No.1 and ignition switch (IG2).


note Prior to the wiring harness inspection, check junction block connector C-207, and repair if necessary.

  • Check the rear window defogger power supply line for open circuit.

Q. Is the check result normal?

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

Repair the wiring harness.

STEP 9. Check the wiring harness between C-217 rear window defogger relay connector No.2 and D-11 rear panel power window-ECU connector No.15.






note Prior to the wiring harness inspection, check junction block connector C-208 and intermediate connector C-15, and repair if necessary.

  • Check the rear window defogger power supply line for open circuit.

Q. Is the check result normal?

Go to Step 10.

Repair the wiring harness.

STEP 10. Check the wiring harness between C-217 rear window defogger relay connector No.3 and D-08 rear window defogger connector No.1.



note Prior to the wiring harness inspection, check junction block connector C-212, and repair if necessary.

  • Check the rear window defogger relay line for open or short circuit.

Q. Is the check result normal?

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

Repair the wiring harness.

STEP 11. Resistance measurement at D-08 rear window defogger connector.

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

(2)Continuity between terminal 2 and body earth.
OK: Continuity (Less than 2Ω)

Q. Is the check result normal?

Go to Step 13.

Go to Step 12.

STEP 12. Check the wiring harness between D-08 rear window defogger connector terminal No.2 and earth.


  • Check the rear window defogger earth line for open circuit.

Q. Is the check result normal?

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

Repair or replace the wiring harness.

STEP 13. Connector check: C-43 A/C-ECU connector



Q. Is the check result normal?

Go to Step 14.

Repair the connector.

STEP 14. Check the wiring harness between C-43 A/C-ECU connector terminal No.14 and D-11 rear panel power window-ECU connector terminal No.3.

note Prior to the wiring harness inspection, check intermediate connector C-15, and repair if necessary.

  • Check the rear window defogger earth line for open circuit.

Q. Is the check result normal?

Go to Step 15.

Repair or replace the wiring harness.

STEP 15. Check the rear window defogger.
Refer to GROUP 54A, Rear Window rear window defogger Inspection .

Q. Does the rear window defogger work normally?

The trouble can be an intermittent malfunction (Refer to GROUP 00, How to Cope with Intermittent Malfunction ).
Repair the rear window defogger.