WINDOW DEFOGGER SYSTEM Rear Window Defogger System does not Operate

DESCRIPTION

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

WIRING DIAGRAM

A0139H7E07

CAUTION / NOTICE / HINT

Note


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

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

PROCEDURE


  1. CHECK AIR CONDITIONING SYSTEM


    1. Check the air conditioning system.

      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.

      OK
      The air conditioning system operates normally.
      Result
      Proceed to
      OK
      NG

    NG

    GO TO AIR CONDITIONING SYSTEM Click here

    OK

  2. PERFORM ACTIVE TEST USING GTS


    1. Connect the GTS to the DLC3.

    2. Turn the power 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) Rear window defogger wire OFF or ON -

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

    NG

    INSPECT DEFOGGER RELAY Click here

    OK

  3. 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.

      OK
      The window defogger system operates normally.
      Result
      Proceed to
      OK
      NG

    OK

    END (AIR CONDITIONING AMPLIFIER ASSEMBLY WAS DEFECTIVE)

    NG

    REPLACE AIR CONDITIONING CONTROL ASSEMBLY Click here

  4. INSPECT DEFOGGER RELAY


    1. Inspect the defogger relay.

      Click here

      Result
      Proceed to
      OK
      NG

    NG

    REPLACE DEFOGGER RELAY

    OK

  5. CHECK HARNESS AND CONNECTOR (DEFOGGER RELAY - IG1 NO. 1 RELAY AND AUXILIARY BATTERY)


    1. A0139N8C01
      *1 No. 1 Engine Room Relay Block and No. 1 Junction Block Assembly
      *a Defogger Relay Holder

      Remove the defogger relay from the No. 1 engine room relay block and No. 1 junction block assembly.

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

      Standard Voltage
      Tester Connection Condition Specified Condition
      Defogger relay holder terminal-1 - Body ground Power switch on (IG) 11 to 14 V
      Defogger relay holder terminal-5 - Body ground Power switch off 11 to 14 V
      Result
      Proceed to
      OK
      NG

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  6. CHECK HARNESS AND CONNECTOR (DEFOGGER RELAY - AIR CONDITIONING AMPLIFIER ASSEMBLY)


    1. A0139N8C01
      *1 No. 1 Engine Room Relay Block and No. 1 Junction Block Assembly
      *a Defogger Relay Holder

      Disconnect the E28 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
      Defogger relay holder terminal-2 - E28-38 (RDFG) Always Below 1 Ω
      Defogger relay holder terminal-2 - Body ground Always 10 kΩ or higher
      Result
      Proceed to
      OK
      NG

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  7. CHECK AIR CONDITIONING AMPLIFIER ASSEMBLY


    1. A013941C10
      *a

      Component with harness connected

      (Air Conditioning Amplifier Assembly)

      Reconnect the E28 air conditioning amplifier assembly connector.

    2. Reinstall the defogger relay.

    3. Remove the air conditioning amplifier assembly with its connectors still connected.

      Click here

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

      Standard Voltage
      Tester Connection Condition Specified Condition
      E28-38 (RDFG) - E28-14 (GND) Power switch on (IG), rear window defogger switch on Below 1 V
      E28-38 (RDFG) - E28-14 (GND) Power 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

  8. CHECK HARNESS AND CONNECTOR (BACK DOOR GLASS (REAR WINDOW DEFOGGER WIRE) - DEFOGGER RELAY AND BODY GROUND)


    1. A0139N8C01
      *1 No. 1 Engine Room Relay Block and No. 1 Junction Block Assembly
      *a Defogger Relay Holder

      Disconnect the Q1 and Q2 back door glass (rear window defogger wire) connectors.

    2. Remove the defogger relay from the No. 1 engine room relay block and No. 1 junction block assembly.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      Q1-1 (B) - Defogger relay holder terminal-3 Always Below 1 Ω
      Q2-1 (E) - Body ground Always Below 1 Ω
      Q1-1 (B) - Body ground Always 10 kΩ or higher
      Result
      Proceed to
      OK
      NG

    OK

    REPAIR OR REPLACE BACK DOOR GLASS (REAR WINDOW DEFOGGER WIRE) for Hatchback: Click here
    REPAIR OR REPLACE BACK DOOR GLASS (REAR WINDOW DEFOGGER WIRE) for Wagon: Click here

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR