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.

WIRING DIAGRAM

B001CY1E01

CAUTION / NOTICE / HINT

Note


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

  • Since the window defogger system has functions that use LIN communication, first confirm that there is no malfunction in the communication system by inspecting the LIN communication functions in accordance with the "How to Proceed with Troubleshooting" procedures. Then, conduct the following inspection procedure.

PROCEDURE


  1. PERFORM ACTIVE TEST USING GTS (DEFOGGER RELAY [REAR])


    1. Using the GTS, perform the Active Test Click here.

      Air Conditioner
      Tester Display Test Part Control Range Diagnostic Note
      Defogger Relay (Rear) Defogger relay (DEF) operation OFF/ON -
      OK
      The defogger relay (DEF) operates normally.

    NG

    INSPECT DEFOGGER RELAY (DEF) Click here

    OK

  2. REPLACE INTEGRATION CONTROL AND PANEL ASSEMBLY


    1. Temporarily replace the heater control with a new or normally functioning one Click here.

    2. Check the rear defogger function.

      OK
      The window defogger function operates normally.

    OK

    END (INTEGRATION CONTROL AND PANEL ASSEMBLY IS DEFECTIVE)

    NG

    REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY Click here

  3. INSPECT DEFOGGER RELAY (DEF)


    1. B001IEBE01

      Remove the defogger relay (DEF) from the engine room relay block, junction block.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      3 - 5 Battery voltage applied between terminals 1 and 2 Below 1 Ω
      3 - 5 Battery voltage not applied between terminals 1 and 2 10 kΩ or higher

    NG

    REPLACE DEFOGGER RELAY (DEF)

    OK

  4. CHECK HARNESS AND CONNECTOR (DEFOGGER RELAY (DEF) - BATTERY AND BODY GROUND)


    1. B001II6C07
      *a

      Front view of wire harness connector

      (to Defogger Relay [DEF])

      Remove the defogger relay (DEF) from the engine room relay block, junction block.

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

      Standard Voltage
      Tester Connection Switch Condition Specified Condition
      Defogger relay (DEF) terminal 2 - Body ground Ignition switch off Below 1 V
      Defogger relay (DEF) terminal 2 - Body ground Ignition switch ON 11 to 14 V
      Defogger relay (DEF) terminal 5 - Body ground Always 11 to 14 V

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  5. CHECK HARNESS AND CONNECTOR (AIR CONDITIONING AMPLIFIER ASSEMBLY - DEFOGGER RELAY [DEF] AND BODY GROUND)


    1. Disconnect the G25 air conditioning amplifier connector.

    2. Remove the defogger relay (DEF) from the engine room relay block, junction block.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      Defogger relay (DEF) terminal 1 - G25-38 (RDEF) Always Below 1 Ω
      G25-14 (GND) - Body ground Always Below 1 Ω
      G25-38 (RDEF) - Body ground Always 10 kΩ or higher

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  6. INSPECT AIR CONDITIONING AMPLIFIER ASSEMBLY


    1. B001EG8C01
      *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
      G25-38 (RDEF) - G25-14 (GND) Ignition switch ON, defogger switch on 11 to 14 V
      G25-38 (RDEF) - G25-14 (GND) Ignition switch ON, defogger switch off Below 1 V

    NG

    REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY Click here

    OK

  7. CHECK HARNESS AND CONNECTOR (BACK DOOR GLASS - DEFOGGER RELAY [DEF] AND BODY GROUND)


    1. Disconnect the Y2*1 or X7*2 and X8*2 back door glass (window defogger wire) connectors.


      • *1: w/ Glass Hatch Opener System

      • *2: w/o Glass Hatch Opener System

    2. Remove the defogger relay (DEF) and MIR HTR relay* from the engine room relay block, junction block.


      • *: for 5L-E

    3. Remove the MIR HTR relay from the No. 5 engine room relay block.*


      • *: except 5L-E, w/ Mirror Heater

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

      Standard Resistance
      w/ Glass Hatch Opener System
      Tester Connection Condition Specified Condition
      Defogger relay (DEF) terminal 3 - Y2-2 Always Below 1 Ω
      Y2-1 - Body ground Always Below 1 Ω
      Y2-2 - Body ground Always 10 kΩ or higher
      w/o Glass Hatch Opener System
      Tester Connection Condition Specified Condition
      Defogger relay (DEF) terminal 3 - X7-1 Always Below 1 Ω
      X8-1 - Body ground Always Below 1 Ω
      X7-1 - Body ground Always 10 kΩ or higher
      Result
      Result Proceed to
      OK (w/ Glass Hatch Opener System) A
      OK (w/o Glass Hatch Opener System) B
      NG C

    A

    REPLACE BACK DOOR GLASS (WINDOW DEFOGGER WIRE) Click here

    B

    REPLACE BACK DOOR GLASS (WINDOW DEFOGGER WIRE) Click here

    C

    REPAIR OR REPLACE HARNESS OR CONNECTOR