Click here

WINDOW DEFOGGER SYSTEM Rear Window Defogger System does not Operate

Click here
Click here
DTC Code DTC Name
  Rear Window Defogger System does not Operate
Click here

DESCRIPTION

An operation request signal is sent to the air conditioning amplifier assembly via LIN communication when the air conditioning control 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.

Click here

WIRING DIAGRAM

Click here

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

    Click here

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

    Click here

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

    Click here

Click here

PROCEDURE


  1. Click here

    CHECK AIR CONDITIONING SYSTEM


    1. Check the air conditioning system.

      Click here

      Tip:

      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

  2. Click here

    CHECK AIR CONDITIONING CONTROL ASSEMBLY


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

      OK
      Defogger indicator illuminates.
      Result
      Proceed to
      OK
      NG

  3. Click here

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


    1. Using the GTS, perform the Active Test.

      Click here


      1. 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 -



      1. 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

  4. Click here

    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 AIR CONDITIONING CONTROL ASSEMBLYClick here

  5. Click here

    READ VALUE USING GTS (STATUS OF REAR DEFOGGER FUSE)


    1. Using the GTS, read the Data List.

      Click here


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

        Disconnect: Fuse shut off

        Connect: Fuse not shut off

        		 -



      1. 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

  6. Click here

    READ VALUE USING GTS (REAR DEFOGGER INPUT SIGNAL)


    1. Using the GTS, read the Data List.

      Click here


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

        ON: Window defogger switch is on

        OFF: Window defogger switch is off

        		 -



      1. Body Electrical > Power Integration No.3 > Data List
        Tester Display
        Rear Defogger Input Signal




      OK
      The Data List value displays "ON" with the air conditioning control assembly (window defogger switch) set to ON.
      Result
      Proceed to
      OK
      NG

  7. Click here

    READ VALUE USING GTS (REAR DEFOGGER OUTPUT SIGNAL)


    1. Using the GTS, read the Data List.

      Click here


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

        ON: Window defogger operates

        OFF: Window defogger does not operate

        		 -



      1. Body Electrical > Power Integration No.3 > Data List
        Tester Display
        Rear Fog Light Output Signal




      OK
      The Data List value displays "ON" with the air conditioning control assembly (window defogger switch) set to ON.
      Result
      Proceed to
      OK
      NG

  8. Click here

    CHECK HARNESS AND CONNECTOR (BACK WINDOW GLASS [WINDOW DEFOGGER WIRE] - BATTERY)


    1. Disconnect the L58 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
      L58-1 (B) - Body ground Power switch on (IG), window defogger switch on 8 V or higher
      Power switch on (IG), window defogger switch off Below 3 V
      Result
      Proceed to
      OK
      NG

  9. Click here

    CHECK HARNESS AND CONNECTOR (BACK WINDOW GLASS [WINDOW DEFOGGER WIRE] - BODY GROUND)


    1. Disconnect the L42 back window glass (window defogger wire) connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      L42-1 (L) - 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

  10. Click here

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


    1. Turn the power switch off.

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

    3. Disconnect the L111 No. 3 semiconductor power integration ECU connector.

    4. Disconnect the L58 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
      L111-2 (L) - L58-1 (B) Always Below 1 Ω
      Result
      Proceed to
      OK
      NG

    • OK

      REPLACE NO. 3 SEMICONDUCTOR POWER INTEGRATION ECUClick here

    • NG

      REPAIR OR REPLACE HARNESS OR CONNECTOR

  11. Click here

    CHECK BACK WINDOW GLASS (WINDOW DEFOGGER WIRE)


    1. Disconnect the L58 back window glass (window defogger wire) connector.

    2. Turn the window defogger switch "OFF" on the air conditioning control assembly.

    3. Turn the window defogger switch "ON" on the air conditioning control assembly.

    4. Using the GTS, read the Data List.

      Click here


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

        Disconnect: Fuse shut off

        Connect: Fuse not shut off

        		 -



      1. 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

  12. Click here

    CHECK RADIO SETTING CONDENSER (NOISE FILTER)


    1. Disconnect the L5 radio setting condenser (noise filter) connector.

    2. Turn the window defogger switch "OFF" on the air conditioning control assembly.

    3. Turn the window defogger switch "ON" on the air conditioning control assembly.

    4. Using the GTS, read the Data List.

      Click here


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

        Disconnect: Fuse shut off

        Connect: Fuse not shut off

        		 -



      1. 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

  13. Click here

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


    1. Turn the power switch off.

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

    3. Disconnect the L111 No. 3 semiconductor power integration ECU connector.

    4. Disconnect the L58 back window glass (window defogger wire) connector.

    5. Disconnect the L5 radio setting condenser (noise filter) connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      L111-2 (L) or L58-1 (B) - Body ground Always 10 kΩ or higher
      Result
      Proceed to
      OK
      NG

    • OK

      REPLACE NO. 3 SEMICONDUCTOR POWER INTEGRATION ECUClick here

    • NG

      REPAIR OR REPLACE HARNESS OR CONNECTOR