WINDOW DEFOGGER SYSTEM Rear Window Defogger System does not Operate

DESCRIPTION

When the rear window defogger switch is turned on, a rear window defogger activation request signal is sent via the LIN communication line to the air conditioning amplifier. Then the air conditioning amplifier operates the rear window defogger. When the on signal from the switch is received, the defogger relay (DEF) is operated for 15 minutes. Also, if the off signal from the switch is received within 15 minutes, the defogger relay (DEF) operation is stopped.

WIRING DIAGRAM

A004Q3TE04

CAUTION / NOTICE / HINT

Note

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

PROCEDURE


  1. READ VALUE USING INTELLIGENT TESTER (Battery Voltage Lo Record)


    1. Using the intelligent tester, inspect battery voltage reduction history "Battery Voltage Lo Record" in the Data List.

      EMPS
      Tester Display Measurement item/Range Normal Condition Diagnostic Note
      Battery Voltage Lo Record Battery voltage reduction history/ Min.: 0 times, Max.: 65535 times 0 to 65535 -
      Result
      Result Proceed to
      Other then 0 (history record is present) A
      0 (no history record is present) B

    A

    GO TO POWER STEERING SYSTEM Click here

    B

  2. CHECK FOR DTC


    1. Check for DTC.

      Result
      Result Proceed to
      DTC is not output A
      LIN DTC is output B

    B

    GO TO LIN COMMUNICATION SYSTEM Click here

    A

  3. PERFORM ACTIVE TEST USING INTELLIGENT TESTER (DEF RELAY)


    1. Select the Active Test using the intelligent tester to generate a control command, and then check that the rear window defogger operates.

      Air Conditioner
      Tester Display Test Part Control Range Diagnostic Note
      Defogger Relay (Rear) Rear window defogger relay operation OFF or ON -

    2. Check that operation sound of the DEF relay is head.

      Result
      Result Proceed to
      The window defogger system operates normally when operating it through the intelligent tester. A
      The window defogger system does not operate normally when operating it through the intelligent tester and DEF relay operating sound is not heard. B
      The window defogger system does not operate normally when operating it through the intelligent tester and DEF relay operating sound is heard.*1 C
      The window defogger system does not operate normally when operating it through the intelligent tester and DEF relay operating sound is heard.*2 D

      *1: for Sedan

      *2: for Wagon


    B

    CHECK HARNESS AND CONNECTOR (MAIN BODY ECU - BATTERY) Click here

    C

    CHECK HARNESS AND CONNECTOR (BACK WINDOW GLASS - MAIN BODY ECU) Click here

    D

    CHECK HARNESS AND CONNECTOR (BACK DOOR GLASS - MAIN BODY ECU) Click here

    A

  4. REPLACE AIR CONDITIONING CONTROL ASSEMBLY


    1. Temporarily replace the air conditioning control assembly with a new or normally functioning one Click here.


    NEXT

  5. CHECK WINDOW DEFOGGER SYSTEM


    1. Turn the ignition switch to ON.

    2. Check that pressing the defogger switch illuminates the indicator and warms the rear window surface.

    3. Check that after approximately 15 minutes, the indicator light turns off and the rear window defogger deactivates.

      OK
      Rear window defogger system functioning normally.

    OK

    END (AIR CONDITIONING CONTROL ASSEMBLY IS DEFECTIVE)

    NG

    REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY Click here

  6. CHECK HARNESS AND CONNECTOR (MAIN BODY ECU - BATTERY)

    A004SEOE04
    Text in Illustration
    *1

    Front view of wire harness connector

    (to Main Body ECU)

    1. Disconnect the DG main body ECU connector.

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

      Standard Voltage
      Tester Connection Condition Specified Condition
      DG-1 - Body ground Always 11 to 14 V

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  7. CHECK HARNESS AND CONNECTOR (AIR CONDITIONING AMPLIFIER - MAIN BODY ECU)

    A004TG8E03
    Text in Illustration
    *1 for Manual Air Conditioning System
    *2 for Automatic Air Conditioning System
    *3

    Front view of wire harness connector

    (to Air Conditioning Amplifier)
    *4

    Front view of wire harness connector

    (to Main Body ECU)

    1. Disconnect the DQ main body ECU connector.

    2. Disconnect the D101*1 or D47*2 air conditioning amplifier connector.

      *1: for Manual Air Conditioning

      *2: for Automatic Air Conditioning

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

      Standard Resistance
      for Manual Air Conditioning System
      Tester Connection Condition Specified Condition
      D101-38 (RDEF) - DQ-12 Always Below 1 Ω
      D101-38 (RDEF) - Body ground Always 10 kΩ or higher
      for Automatic Air Conditioning System
      Tester Connection Condition Specified Condition
      D47-38 (RDEF) - DQ-12 Always Below 1 Ω
      D47-38 (RDEF) - Body ground Always 10 kΩ or higher

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  8. CHECK HARNESS AND CONNECTOR (AIR CONDITIONING AMPLIFIER ASSEMBLY - BATTERY)

    A004TU4E02
    Text in Illustration
    *1 for Manual Air Conditioning System
    *2 for Automatic Air Conditioning System
    *3

    Front view of wire harness connector

    (to Air Conditioning Amplifier)

    1. Reconnect the D101*1 or D47*2 air conditioning amplifier connector.

      *1: for Manual Air Conditioning

      *2: for Automatic Air Conditioning

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

      Standard Voltage
      for Manual Air Conditioning System
      Tester Connection Condition Specified Condition
      D101-38 (RDEF) - Body ground Ignition switch ON 11 to 14 V
      for Automatic Air Conditioning System
      Tester Connection Condition Specified Condition
      D47-38 (RDEF) - Body ground Ignition switch ON 11 to 14 V

    OK

    REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY Click here

    NG

    REPLACE MAIN BODY ECU (INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY)

  9. CHECK HARNESS AND CONNECTOR (BACK WINDOW GLASS - MAIN BODY ECU)

    A004Q6DE02
    Text in Illustration
    *1

    Front view of wire harness connector

    (to Back Window Glass)
    *2

    Front view of wire harness connector

    (to Main Body ECU)

    1. Disconnect the DF main body ECU connector.

    2. Disconnect the N1 and G26 rear window defogger wire connectors.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      G26-1 - DF-2 Always Below 1 Ω
      N1-1 - Body ground
      G26-1 - Body ground Always 10 kΩ or higher

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  10. CHECK BACK WINDOW GLASS (WINDOW DEFOGGER WIRE)

    A004TBBE02
    Text in Illustration
    *1

    Component without wire harness connector

    (Back Window Glass)

    1. Disconnect the N1 and G26 window defogger wire connectors.

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

      Standard Voltage
      Tester Connection Switch Condition Specified Condition
      G26-1 - N1-1 Ignition switch ON and defogger switch on 11 to 14 V

    OK

    REPLACE BACK WINDOW GLASS Click here

    NG

    REPLACE AIR CONDITIONING CONTROL ASSEMBLY Click here

  11. CHECK HARNESS AND CONNECTOR (BACK DOOR GLASS - MAIN BODY ECU)

    A004RO4E02
    Text in Illustration
    *1

    Front view of wire harness connector

    (to Back Door Glass)
    *2

    Front view of wire harness connector

    (to Main Body ECU)

    1. Disconnect the DF main body ECU connector.

    2. Disconnect the M7 and M8 rear window defogger wire connectors.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      M8-1 - DF-2 Always Below 1 Ω
      M7-1 - Body ground
      M8-1 - Body ground Always 10 kΩ or higher

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  12. CHECK BACK DOOR GLASS (WINDOW DEFOGGER WIRE)

    A004TIBE02
    Text in Illustration
    *1

    Component without wire harness connector

    (Back Door Glass)

    1. Disconnect the M7 and M8 window defogger wire connectors.

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

      Standard Voltage
      Tester Connection Switch Condition Specified Condition
      M8-1 - M7-1 Ignition switch ON and defogger switch on 11 to 14 V

    OK

    REPLACE BACK DOOR GLASS Click here

    NG

    REPLACE AIR CONDITIONING CONTROL ASSEMBLY Click here