WINDOW DEFOGGER SYSTEM Rear Window Defogger System does not Operate

DESCRIPTION

When the rear defogger 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 DEF relay to operate the window defogger system.

WIRING DIAGRAM

A01QTRYE01

CAUTION / NOTICE / HINT

Note


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

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

    Click here

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.

      Result
      Proceed to
      The air conditioning system operates normally
      The air conditioning system does not operate normally

    The air conditioning system does not operate normally

    GO TO AIR CONDITIONING SYSTEM Click here

    The air conditioning system operates normally

  2. PERFORM ACTIVE TEST USING GTS


    1. Connect the GTS to the DLC3.

    2. Turn the ignition switch to ON.

    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) DEF relay OFF or ON -

      Body Electrical > Air Conditioner > Active Test
      Tester Display
      Defogger Relay (Rear)
      Result
      Proceed to
      The window defogger system operates normally
      The window defogger system does not operate normally

    The window defogger system does not operate normally

    INSPECT DEF RELAY Click here

    The window defogger system operates normally

  3. CHECK 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.

      Result
      Proceed to
      The window defogger system operates normally
      The window defogger system does not operate normally

    The window defogger system operates normally

    END (AIR CONDITIONING AMPLIFIER ASSEMBLY WAS DEFECTIVE)

    The window defogger system does not operate normally

    REPLACE AIR CONDITIONING CONTROL ASSEMBLY Click here

  4. INSPECT DEF RELAY


    1. Remove the DEF relay from the No. 2 engine room relay block, junction block assembly.

      Click here

    2. Inspect the DEF relay.

      Click here

      Result
      Proceed to
      OK
      NG

    NG

    REPLACE DEF RELAY

    OK

  5. CHECK HARNESS AND CONNECTOR (DEF RELAY - AIR CONDITIONING AMPLIFIER ASSEMBLY AND BATTERY)


    1. Remove the DEF relay from the No. 2 engine room relay block, junction block assembly.

      Click here

    2. Disconnect the G81 air conditioning amplifier assembly connector.

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

      Standard Voltage
      Tester Connection Condition Specified Condition
      DEF relay holder terminal-1 - Body ground Ignition switch ON 11 to 14 V
      DEF relay holder terminal-1 - Body ground Ignition switch off Below 1 V
      DEF relay holder terminal-3 - Body ground Always 11 to 14 V

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      DEF relay holder terminal-2 - G81-38 (RDFG) Always Below 1 Ω
      DEF relay holder terminal-2 - Body ground Always 10 kΩ or higher
      Result
      Proceed to
      OK
      NG

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  6. CHECK HARNESS AND CONNECTOR (BACK DOOR GLASS - DEF RELAY AND BODY GROUND)


    1. Disconnect the U2 and G back door glass connectors.

    2. Remove the DEF relay from the No. 2 engine room relay block, junction block assembly.

      Click here

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      U2-1 (B) - DEF relay holder terminal-5 Always Below 1 Ω
      G-1 - Body ground Always Below 1 Ω
      U2-1 (B) - Body ground Always 10 kΩ or higher
      Result
      Proceed to
      OK
      NG

    NG

    PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE Click here

    OK

  7. CHECK BACK DOOR GLASS (DEFOGGER WIRE)


    1. Perform the on-vehicle inspection, check that the window defogger system operates normally.

      Click here

      Result
      Proceed to
      The window defogger system operates normally
      The window defogger system does not operate normally

    The window defogger system operates normally

    REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY Click here

    The window defogger system does not operate normally

    REPAIR BACK DOOR GLASS (DEFOGGER WIRE) Click here