WINDOW DEFOGGER SYSTEM Rear Window Defogger System does not Operate

DESCRIPTION

When the window defogger switch is turned on, a window defogger activation request signal is sent via the CAN communication line and UART communication line to the air conditioning amplifier assembly. Then the air conditioning amplifier assembly operates the 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

A01EQZVE01

INSPECTION PROCEDURE

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.


      Result
      Result Proceed to
      DTC is not output A
      CAN DTC is output (for LHD) B
      CAN DTC is output (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 INTELLIGENT TESTER (DEFOGGER RELAY)


    1. Select the Active Test using the intelligent tester 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 intelligent tester screen, item changes between ON and OFF according to above chart.
      Result
      Result Proceed to
      OK (w/ Navigation System) A
      OK (w/o Navigation System) B
      NG C

    B

    CHECK AUDIO AND VISUAL SYSTEM Click here

    C

    INSPECT DEFOGGER RELAY (DEFOG) Click here

    A

  3. CHECK NAVIGATION SYSTEM


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

      OK
      Navigation system function properly.

    NG

    GO TO 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.

    NG

    REPLACE MULTI-MEDIA MODULE RECEIVER ASSEMBLY Click here

    OK

    END (AIR CONDITIONING AMPLIFIER ASSEMBLY WAS DEFECTIVE)

  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.

    NG

    REPLACE MULTI-DISPLAY ASSEMBLY Click here

    OK

    END (MULTI-MEDIA MODULE RECEIVER ASSEMBLY WAS DEFECTIVE)

  8. CHECK AUDIO AND VISUAL SYSTEM


    1. Check if the audio and visual system function properly Click here.

      OK
      Audio and visual system function properly.

    NG

    GO TO AUDIO AND VISUAL SYSTEM Click here

    OK

  9. REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY


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


    NEXT

  10. 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.

    NG

    REPLACE MULTI-MEDIA MODULE RECEIVER ASSEMBLY Click here

    OK

    END (AIR CONDITIONING AMPLIFIER ASSEMBLY WAS DEFECTIVE)

  11. 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

  12. 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.

    NG

    REPLACE MULTI-DISPLAY ASSEMBLY Click here

    OK

    END (MULTI-MEDIA MODULE RECEIVER ASSEMBLY WAS DEFECTIVE)

  13. INSPECT DEFOGGER RELAY (DEFOG)


    1. A01ESAFE01

      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

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


    1. A01EOOVE02

      Remove the defogger relay from the engine room relay block.

    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

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

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


    1. A01EOQHE03

      Disconnect the S17 and S18 defogger wire connectors.

    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
      S17-1 (B) - Defogger relay terminal 3 Always Below 1 Ω
      S18-1 (E) - Body ground
      Defogger relay terminal 4 - Body ground
      S17-1 (B) - Body ground Always 10 kΩ or higher

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  16. CHECK WINDOW DEFOGGER WIRE


    1. A01ESFRE02

      Disconnect the S17 and S18 defogger wire connectors.

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

      Standard Voltage
      Tester Connection Switch Condition Specified Condition
      S17-1 (B) - S18-1 (E) Engine switch on (IG) and defogger switch on 11 to 14 V

    NG

    REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY Click here

    OK

    REPAIR OR REPLACE BACK WINDOW GLASS Click here