WINDOW DEFOGGER SYSTEM Rear Window Defogger System does not Operate

DESCRIPTION

When the rear window defogger switch on the radio receiver assembly is pressed, the operation signal is transmitted to the air conditioning amplifier assembly through a CAN communication line. When the air conditioning amplifier assembly receives the signal, it turns on the No. 2 integration relay to operate the rear window defogger.

WIRING DIAGRAM

Refer to the "System Diagram"

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CAUTION / NOTICE / HINT

Note


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

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

    Click here

PROCEDURE


  1. CHECK CAN COMMUNICATION SYSTEM


    1. Use the GTS to check if the CAN communication system is functioning normally.


      Result
      Result Proceed to
      CAN DTC is not output A
      CAN DTC is output (for LHD) B
      CAN DTC is output (for RHD) C

    B

    GO TO CAN COMMUNICATION SYSTEM Click here

    C

    GO TO CAN COMMUNICATION SYSTEM Click here

    A

  2. 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 through 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

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


    1. Connect the GTS to the DLC3.

    2. Turn the engine switch on (IG).

    3. Turn the GTS on.

    4. Enter the following menus: Body Electrical / Air Conditioner / Active Test.

    5. Perform the Active Test according to the display on the GTS.


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

      Body Electrical > Air Conditioner > Active Test
      Tester Display
      Defogger Relay (Rear)
      OK
      The rear window defogger system operates normally.
      Result
      Proceed to
      OK
      NG

    NG

    CHECK HARNESS AND CONNECTOR (NO. 2 INTEGRATION RELAY - BATTERY AND BODY GROUND) Click here

    OK

  4. REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY


    1. Replace the air conditioning amplifier assembly with a new or known good 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 WAS DEFECTIVE)

    NG

    REPLACE RADIO RECEIVER ASSEMBLY Click here

  5. CHECK HARNESS AND CONNECTOR (NO. 2 INTEGRATION RELAY - BATTERY AND BODY GROUND)


    1. B002E7DC01
      *a

      Front view of wire harness connector

      (to No. 2 Integration Relay)

      Disconnect the No. 2 integration relay connectors.

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

      Standard Voltage
      Tester Connection Switch Condition Specified Condition
      2G-1 (ALT) - Body ground Always 11 to 14 V
      2B-8 (IG1A) - Body ground Engine switch on (IG) 11 to 14 V
      2B-8 (IG1A) - Body ground Engine switch off Below 1 V

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      2B-10 (GNDB) - Body ground Always Below 1 Ω
      2A-22 (GNDA) - Body ground Always Below 1 Ω
      Result
      Proceed to
      OK
      NG

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  6. CHECK HARNESS AND CONNECTOR (AIR CONDITIONING AMPLIFIER ASSEMBLY - NO. 2 INTEGRATION RELAY AND BODY GROUND)


    1. Disconnect the K64 air conditioning amplifier assembly connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      K64-25 (RDEF) - 2A-26 (DEF) Always Below 1 Ω
      K64-25 (RDEF) - Body ground Always 10 kΩ or higher
      K64-1 (GND) - Body ground Always Below 1 Ω
      Result
      Proceed to
      OK
      NG

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  7. CHECK NO. 2 INTEGRATION RELAY


    1. Reconnect the 2A, 2B and 2G No. 2 integration relay connectors.

    2. B002EARC12
      *a

      Rear view of wire harness connector

      (to Air Conditioning Amplifier Assembly)

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

      Standard Voltage
      Tester Connection Switch Condition Specified Condition
      K64-25 (RDEF) - Body ground Engine switch off Below 1 V
      K64-25 (RDEF) - Body ground Engine switch on (IG) 11 to 14 V
      Result
      Proceed to
      OK
      NG

    NG

    REPLACE NO. 2 INTEGRATION RELAY Click here

    OK

  8. CHECK AIR CONDITIONING AMPLIFIER ASSEMBLY


    1. Reconnect the K64 air conditioning amplifier assembly connector.

    2. B002DTXC51
      *a

      Component with harness connected

      (Air Conditioning Amplifier Assembly)

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

      Standard Voltage
      Tester Connection Switch Condition Specified Condition
      K64-25 (RDEF) - K64-1 (GND) Engine switch on (IG), Rear window defogger switch on Below 2.2 V
      K64-25 (RDEF) - K64-1 (GND) Engine switch on (IG), Rear window defogger switch off 11 to 14 V
      Result
      Proceed to
      OK
      NG

    NG

    REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY Click here

    OK

  9. CHECK HARNESS AND CONNECTOR (NO. 2 INTEGRATION RELAY - BACK WINDOW GLASS)


    1. Disconnect the 2C No. 2 integration relay connector.

    2. Disconnect the U19 back window glass connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      2C-1 (RDEF) - U19-1 Always Below 1 Ω
      2C-1 (RDEF) - Body ground Always 10 kΩ or higher
      Result
      Proceed to
      OK
      NG

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  10. CHECK HARNESS AND CONNECTOR (BACK WINDOW GLASS - BODY GROUND)


    1. Disconnect the back window glass connector.

    2. B002CA9C01
      *a

      Front view of wire harness connector

      (to Back Window Glass)

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      T20-1 - Body ground Always Below 1 Ω
      Result
      Proceed to
      OK
      NG

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  11. CHECK NO. 2 INTEGRATION RELAY


    1. Reconnect the 2C No. 2 integration relay connector.

    2. B002DZPC01
      *a

      Front view of wire harness connector

      (to Back Window Glass)

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

      Standard Voltage
      Tester Connection Condition Specified Condition
      U19-1 - Body ground Engine switch on (IG), Rear window defogger switch on 11 to 14 V
      U19-1 - Body ground Engine switch on (IG), Rear window defogger switch on Below 1 V
      Result
      Proceed to
      OK
      NG

    OK

    REPLACE BACK WINDOW GLASS (REAR WINDOW DEFOGGER) Click here

    NG

    REPLACE NO. 2 INTEGRATION RELAY Click here