WINDOW DEFOGGER SYSTEM Rear Window Defogger System does not Operate

DESCRIPTION

An operation request signal is sent to the air conditioning amplifier assembly via LIN communication when the integration control and panel assembly (window defogger switch) is operated.

When the air conditioning amplifier assembly receives the signal, it sends an operation request signal via CAN communication to the main body ECU (multiplex network body ECU).

When the main body ECU (multiplex network body ECU) receives the signal, it sends an operation request signal via CPXI communication to the No. 3 semiconductor power integration ECU.

After the operation request signal is received by the No. 3 semiconductor power integration ECU it outputs an operation signal and operates the window defogger.

WIRING DIAGRAM

B000WGRE01

CAUTION / NOTICE / HINT

Note


  • The window defogger system uses the CAN communication system. Inspect the communication function by following How to Proceed with Troubleshooting. Troubleshoot the window defogger system after confirming that the communication system is functioning properly.

    Click here

  • The window defogger system uses the CXPI communication system. Inspect the communication function by following How to Proceed with Troubleshooting. Troubleshoot the window defogger system after confirming that the communication system is functioning properly.

    Click here

  • The window defogger system is controlled by the power integration system. Troubleshoot by checking if there are any malfunctions in the power integration system by following the steps in "How to Proceed with Troubleshooting".

    Click here

  • If the battery voltage becomes low, window defogger operation is canceled to prioritize supplying power to the power steering system.

    Click here

  • With the negative (-) battery terminal connected, disconnect/do not connect the connector of the No. 3 semiconductor power integration ECU.

  • When replacing the No. 3 semiconductor power integration ECU, the system may not operate normally if the same part number is not used.

  • After turning the engine switch off, waiting time may be required before disconnecting the cable from the negative (-) battery terminal. Therefore, make sure to read the disconnecting the cable from the negative (-) battery terminal notices before proceeding with work.

    Click here

  • When disconnecting the cable from the negative (-) battery terminal while performing repairs, some systems need to be initialized after the cable is reconnected.

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PROCEDURE


  1. CHECK AIR CONDITIONING SYSTEM


    1. Check the air conditioning system.

      Click here

      Tech Tips

      Both the window defogger 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. CHECK INTEGRATION CONTROL AND PANEL ASSEMBLY


    1. Check that the defogger indicator illuminates when the window defogger switch is on.

      OK
      Defogger indicator illuminates.
      Result
      Proceed to
      OK
      NG

    NG

    REPLACE INTEGRATION CONTROL AND PANEL ASSEMBLY Click here

    OK

  3. PERFORM ACTIVE TEST USING GTS (DEFOGGER RELAY (REAR))


    1. Using the GTS, perform the Active Test.

      Click here


      Body Electrical > Air Conditioner > Active Test
      Tester Display Measurement Item Control Range Diagnostic Note
      Defogger Relay (Rear) Back window glass (window defogger wire) OFF or ON -

      Body Electrical > Air Conditioner > Active Test
      Tester Display
      Defogger Relay (Rear)
      OK
      Back window glass (window defogger wire) warms up.
      Result
      Proceed to
      OK
      NG

    NG

    READ VALUE USING GTS (STATUS OF REAR DEFOGGER FUSE) Click here

    OK

  4. CHECK AIR CONDITIONING AMPLIFIER ASSEMBLY


    1. Temporarily replace the air conditioning amplifier assembly with a new or normally functioning one.

      Click here

    2. Check that the window defogger system operates normally.

      Click here

      OK
      The window defogger system operates normally.
      Result
      Proceed to
      OK
      NG

    OK

    END (AIR CONDITIONING AMPLIFIER ASSEMBLY IS DEFECTIVE)

    NG

    REPLACE INTEGRATION CONTROL AND PANEL ASSEMBLY Click here

  5. READ VALUE USING GTS (STATUS OF REAR DEFOGGER FUSE)


    1. Using the GTS, read the Data List.

      Click here


      Body Electrical > Power Integration No.3 > Data List
      Tester Display Measurement Item Range Normal Condition Diagnostic Note
      Status of Rear Defogger Fuse Rear defogger fuse condition Disconnect or Connect

      Disconnect: Fuse shut off

      Connect: Fuse not shut off

      		 -

      Body Electrical > Power Integration No.3 > Data List
      Tester Display
      Status of Rear Defogger Fuse
      OK
      The Data List value displays "Connect".
      Result
      Proceed to
      OK
      NG

    NG

    CHECK BACK WINDOW GLASS (WINDOW DEFOGGER WIRE) Click here

    OK

  6. READ VALUE USING GTS (REAR DEFOGGER INPUT SIGNAL)


    1. Using the GTS, read the Data List.

      Click here


      Body Electrical > Power Integration No.3 > Data List
      Tester Display Measurement Item Range Normal Condition Diagnostic Note
      Rear Defogger Input Signal Rear defogger input condition ON or OFF

      ON: Rear defogger operates

      OFF: Rear defogger does not operate

      		 -

      Body Electrical > Power Integration No.3 > Data List
      Tester Display
      Rear Defogger Input Signal
      OK
      The Data List value displays "ON" with the integration control and panel assembly (window defogger switch) set to ON.
      Result
      Proceed to
      OK
      NG

    NG

    REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY Click here

    OK

  7. READ VALUE USING GTS (REAR DEFOGGER OUTPUT SIGNAL)


    1. Using the GTS, read the Data List.

      Click here


      Body Electrical > Power Integration No.3 > Data List
      Tester Display Measurement Item Range Normal Condition Diagnostic Note
      Rear Defogger Output Signal Rear defogger output condition ON or OFF

      ON: Rear defogger is on

      OFF: Rear defogger is off

      		 -

      Body Electrical > Power Integration No.3 > Data List
      Tester Display
      Rear Fog Light Output Signal
      OK
      The Data List value displays "ON" with the integration control and panel assembly (window defogger switch) set to ON.
      Result
      Proceed to
      OK
      NG

    NG

    REPLACE NO. 3 SEMICONDUCTOR POWER INTEGRATION ECU Click here

    OK

  8. CHECK NO. 3 SEMICONDUCTOR POWER INTEGRATION ECU


    1. B000TU5C03
      *a

      Front view of wire harness connector

      (to Back Window Glass [Window Defogger Wire])

      Disconnect the back window glass (window defogger wire) connector.

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

      Standard Voltage
      Tester Connection Switch Condition Specified Condition
      X55-1 (B) - Body ground Engine switch on (IG), window defogger switch on 8 V or higher
      Engine switch on (IG), window defogger switch off Below 3 V
      Result
      Proceed to
      OK
      NG

    NG

    CHECK HARNESS AND CONNECTOR (NO. 3 SEMICONDUCTOR POWER INTEGRATION ECU - BACK WINDOW GLASS [WINDOW DEFOGGER WIRE]) Click here

    OK

  9. INSPECT NO. 1 REAR WINDOW WIRE


    1. Remove the No. 1 rear window wire.

      Click here

    2. Inspect the No. 1 rear window wire.

      Click here

      Result
      Proceed to
      OK
      NG

    NG

    REPLACE NO. 1 REAR WINDOW WIRE Click here

    OK

  10. CHECK HARNESS AND CONNECTOR (NO. 1 REAR WINDOW WIRE - BODY GROUND)


    1. B000TU1C01
      *a

      Front view of wire harness connector

      (to No. 1 Rear Window Wire)

      Disconnect the No. 1 rear window wire connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      eX1-1 - Body ground Always Below 1 Ω
      Result
      Proceed to
      OK
      NG

    OK

    REPAIR BACK WINDOW GLASS (WINDOW DEFOGGER WIRE) Click here

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

  11. CHECK HARNESS AND CONNECTOR (NO. 3 SEMICONDUCTOR POWER INTEGRATION ECU - BACK WINDOW GLASS [WINDOW DEFOGGER WIRE])


    1. Turn the engine switch off.

    2. Disconnect the cable from the negative (-) battery terminal.

    3. Disconnect the X99 No. 3 semiconductor power integration ECU connector.

    4. Disconnect the X55 back window glass (window defogger wire) connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      X99-2 (L) - X55-1 (B) Always Below 1 Ω
      Result
      Proceed to
      OK
      NG

    OK

    REPLACE NO. 3 SEMICONDUCTOR POWER INTEGRATION ECU Click here

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

  12. CHECK BACK WINDOW GLASS (WINDOW DEFOGGER WIRE)


    1. Disconnect the X55 back window glass (window defogger wire) connector.

    2. Turn the window defogger switch "OFF" on the integration control and panel assembly.

    3. Turn the window defogger switch "ON" on the integration control and panel assembly.

    4. Using the GTS, read the Data List.

      Click here


      Body Electrical > Power Integration No.3 > Data List
      Tester Display Measurement Item Range Normal Condition Diagnostic Note
      Status of Rear Defogger Fuse Rear defogger fuse condition Disconnect or Connect

      Disconnect: Fuse shut off

      Connect: Fuse not shut off

      		 -

      Body Electrical > Power Integration No.3 > Data List
      Tester Display
      Status of Rear Defogger Fuse
      OK
      The Data List value displays "Connect".
      Result
      Proceed to
      OK
      NG

    OK

    REPLACE BACK WINDOW GLASS (WINDOW DEFOGGER WIRE) Click here

    NG

  13. CHECK HARNESS AND CONNECTOR (NO. 3 SEMICONDUCTOR POWER INTEGRATION ECU - BACK WINDOW GLASS [WINDOW DEFOGGER WIRE])


    1. Turn the engine switch off.

    2. Disconnect the cable from the negative (-) battery terminal.

    3. Disconnect the X99 No. 3 semiconductor power integration ECU connector.

    4. Disconnect the X55 back window glass (window defogger wire) connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      X99-2 (L) or X55-1 (B) - Body ground Always 10 kΩ or higher
      Result
      Proceed to
      OK
      NG

    OK

    REPLACE NO. 3 SEMICONDUCTOR POWER INTEGRATION ECU Click here

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR