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 CAN communication line and to the air conditioning amplifier assembly. Then the air conditioning amplifier assembly operates the rear window defogger. When the on signal from the switch is received, the defogger relay (DEFOG) is operated for 15 minutes. Also, if the off signal from the switch is received within 15 minutes, the defogger relay (DEFOG) operation is stopped.

WIRING DIAGRAM

A01WVHHE01

CAUTION / NOTICE / HINT

Note

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

PROCEDURE


  1. CHECK FOR DTC


    1. Check if the CAN communication system is functioning normally.


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

    B

    GO TO CAN COMMUNICATION SYSTEM Click here

    C

    GO TO CAN COMMUNICATION SYSTEM Click here

    A

  2. PERFORM ACTIVE TEST USING TECHSTREAM (DEFOGGER RELAY)


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

      Air Conditioner
      Tester Display Test Part Control Range Diagnostic Note
      Defogger Relay (Rear) Rear window defogger relay operation OFF or ON -
      OK
      On Techstream screen, item changes between ON and OFF according to above chart.

    NG

    INSPECT DEFOGGER RELAY (DEFOG) Click here

    OK

  3. CHECK NAVIGATION SYSTEM


    1. Check if the navigation system function properly Click here.

      OK
      Navigation system function properly.

    NG

    CHECK AND REPLACE NAVIGATION SYSTEM Click here

    OK

  4. REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY


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


    NEXT

  5. CHECK WINDOW DEFOGGER SYSTEM


    1. Turn the engine switch on (IG).

    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 AMPLIFIER ASSEMBLY WAS DEFECTIVE)

    NG

  6. REPLACE MULTI-MEDIA MODULE RECEIVER ASSEMBLY


    1. Temporarily replace the multi-media module receiver assembly with a new or normally functioning one Click here.


    NEXT

  7. CHECK WINDOW DEFOGGER SYSTEM


    1. Turn the engine switch on (IG).

    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 (MULTI-MEDIA MODULE RECEIVER ASSEMBLY WAS DEFECTIVE)

    NG

    REPLACE MULTI-DISPLAY ASSEMBLY Click here

  8. INSPECT DEFOGGER RELAY (DEFOG)


    1. A01WPT9E01

      Remove the defogger relay from the engine room relay block.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      3 - 4 Battery voltage is not applied to terminals 1 and 2 Below 1 Ω
      3 - 5 10 kΩ or higher
      3 - 4 Battery voltage is applied to terminals 1 and 2 10 kΩ or higher
      3 - 5 Below 1 Ω

    NG

    REPLACE DEFOGGER RELAY

    OK

  9. CHECK HARNESS AND CONNECTOR (DEFOGGER RELAY - AIR CONDITIONING AMPLIFIER AND BATTERY)


    1. Remove the defogger relay from the engine room relay block.

      A01WR2TE01
      *1 Component without relay connected:
      *2 Rear view of wire harness connector:
      *3 Defogger Relay (DEFOG)

    2. Disconnect the E36 air conditioning amplifier connector.

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

      Standard Voltage
      Tester Connection Condition Specified Condition
      Defogger relay terminal 1 - Body ground Engine switch on (IG) 11 to 14 V
      Defogger relay terminal 5 - 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
      Defogger relay terminal 2 - E36-24 (RDEF) Always Below 1 Ω
      Defogger relay terminal 2 - Body ground Always 10 kΩ higher

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  10. CHECK HARNESS AND CONNECTOR (WINDOW DEFOGGER WIRE - DEFOGGER RELAY AND BODY GROUND)


    1. Disconnect the S26 and S25 defogger connectors.

      A01WW7BE01
      *1 Component without relay connected: (Engine Room Relay Block)
      *2 Front view of wire harness connector: (to Window Defogger Wire)
      *3 Defogger Relay (DEFOG)

    2. Remove the defogger relay from the engine room relay block.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      S25-1 (B) - Defogger relay terminal 3 Always Below 1 Ω
      S26-1 (E) - Body ground
      Defogger relay terminal 4 - Body ground
      S25-1 (B) - Body ground Always 10 kΩ or higher

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  11. CHECK REAR WINDOW DEFOGGER WIRE


    1. A01WS14E03
      *1 Component without wire harness connected: (Rear Window Defogger Wire)

      Disconnect the S26 and S25 defogger connectors.

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

      Standard Voltage
      Tester Connection Switch Condition Specified Condition
      S25-1 (B) - S26-1 (E) Engine switch on (IG) and defogger switch on 11 to 14 V

    OK

    REPAIR OR REPLACE BACK WINDOW GLASS Click here

    NG

    REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY Click here