WINDSHIELD DEICER SYSTEM Windshield Deicer does not Operate

DESCRIPTION

When the windshield deicer switch on the air conditioning control assembly is pressed, the operation signal is transmitted to the air conditioning amplifier assembly. via LIN communication. When the air conditioning amplifier assembly receives the signal, it turns on the DEICER relay to operate the windshield deicer system.

WIRING DIAGRAM

A002Z4TE02

CAUTION / NOTICE / HINT

Note


  • Inspect the fuses for circuits related to this system before performing the following procedure.

  • If the auxiliary battery voltage becomes low, windshield deicer operation is canceled to prioritize supplying power to the power steering system.

PROCEDURE


  1. CHECK AIR CONDITIONING SYSTEM


    1. Check air conditioning system.

      Tech Tips

      Both the windshield deicer system operation signal and air conditioning system operation signal are transmitted to the air conditioning amplifier assembly via the same communication line.

      OK
      The air conditioning system operates normally.
      Result
      Proceed to
      OK
      NG

    NG

    GO TO AIR CONDITIONING SYSTEM Click here

    OK

  2. PERFORM ACTIVE TEST USING GTS


    1. Using the GTS, perform the Active Test.

      Click here


      Body Electrical > Air Conditioner > Active Test
      Tester Display Measurement Item Control Range Diagnostic Note
      Deicer Relay (Front) Windshield glass (windshield deicer) OFF or ON -

      Body Electrical > Air Conditioner > Active Test
      Tester Display
      Deicer Relay (Front)
      OK
      The windshield deicer system operates normally.
      Result
      Proceed to
      OK
      NG

    NG

    CHECK HARNESS AND CONNECTOR (INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY - AUXILIARY BATTERY) Click here

    OK

  3. REPLACE AIR CONDITIONING CONTROL ASSEMBLY


    1. Replace sir conditioning control assembly with a new or known good one.

      Click here

    2. Check that the window defogger system operates normally.

      Click here

      Result
      Proceed to
      OK
      NG

    OK

    END (AIR CONDITIONING CONTROL ASSEMBLY WAS DEFECTIVE)

    NG

    REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY Click here

  4. CHECK HARNESS AND CONNECTOR (INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY - AUXILIARY BATTERY)


    1. A002Z9SC09
      *a

      Front view of wire harness connector

      (to Instrument Panel Junction Block Assembly)

      Disconnect the 3F and 3A instrument panel junction block assembly connectors.

    2. Measure the voltage according to the value(s) in the table below.

      Standard Voltage
      Tester Connection Switch Condition Specified Condition
      3F-5 - Body ground Power switch off 11 to 14 V
      3A-21 - Body ground Power switch on (IG) 11 to 14 V
      Result
      Proceed to
      OK
      NG

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  5. CHECK HARNESS AND CONNECTOR (INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY - AIR CONDITIONING AMPLIFIER)


    1. Disconnect the 3A instrument panel junction block assembly connector.

    2. Disconnect the F73 air conditioning amplifier assembly connector.

    3. Measure the resistance according to the value(s) in the table below.

      Standard Resistance
      Tester Connection Condition Specified Condition
      3A-18 - F73-17 (FDEF) Always Below 1 Ω
      3A-18 or F73-17 (FDEF) - Body ground Always 10 kΩ or higher
      Result
      Proceed to
      OK
      NG

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  6. INSPECT INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY


    1. Remove the instrument panel junction block assembly.

      Click here

      A002Z0OC02
      *a Component without harness connected (Instrument Panel Junction Block) - -

    2. Measure the resistance according to the value(s) in the table below.

      Standard Resistance
      Tester Connection Condition Specified Condition
      3F-5 - 3F-4 Auxiliary battery voltage applied between terminals 3A-21 and 3A-18 Below 1 Ω
      Auxiliary battery voltage not applied between terminals 3A-21 and 3A-18 10 kΩ or higher
      Result
      Proceed to
      OK
      NG

    NG

    REPLACE INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY Click here

    OK

  7. CHECK HARNESS AND CONNECTOR (INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY -WINDSHIELD GLASS (WINDSHIELD DEICER))


    1. Disconnect the A64 windshield glass (windshield deicer) connector.

    2. Disconnect the 3F instrument panel junction block.

    3. Measure the voltage according to the value(s) in the table below.

      Standard resistance
      Tester Connection Condition Specified Condition
      3F-4 - A64-1(B) Always Below 1 Ω
      3F-4 or A64-1(B) - Body ground Always 10 kΩ or higher
      Result
      Proceed to
      OK
      NG

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  8. CHECK HARNESS AND CONNECTOR (WINDSHIELD GLASS [WINDSHIELD DEICER] - BODY GROUND)


    1. A002Z6NC08
      *a

      Front view of wire harness connector

      (to Windshield Glass [Windshield Deicer])

      Disconnect the windshield glass (windshield deicer) connector.

    2. Measure the resistance according to the value(s) in the table below.

      Standard Resistance
      Tester Connection Condition Specified Condition
      A64-2 (E) - Body ground Always Below 1 Ω
      Result
      Proceed to
      OK
      NG

    OK

    REPLACE WINDSHIELD GLASS (WINDSHIELD DEICER) Click here

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR