WINDSHIELD DEICER SYSTEM Windshield Deicer does not Operate

DESCRIPTION

When the windshield deicer switch is turned on, a windshield deicer activation request signal is sent via the CAN communication line to the air conditioning amplifier assembly. Then the air conditioning amplifier operates the windshield deicer. When the on signal from the switch is received, the deicer relay (DEICER) is operated for 15 minutes. Also, if the off signal from the switch is received within 15 minutes, the deicer relay (DEICER) operation is stopped.

WIRING DIAGRAM

A01WTBIE01

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. Click here.

      OK
      DTC is not output.

    NG

    GO TO CAN COMMUNICATION SYSTEM Click here

    OK

  2. PERFORM ACTIVE TEST USING TECHSTREAM (DEICER RELAY)


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

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

    NG

    INSPECT DEICER RELAY Click here

    OK

  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 WINDSHIELD DEICER SYSTEM


    1. Turn the engine switch on (IG).

    2. Check that pressing the windshield deicer switch illuminates the indicator and warms the front windshield surface.

    3. Check that after approximately 15 minutes, the indicator light turns off and the windshield deicer deactivates.

      OK
      Windshield deicer 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 WINDSHIELD DEICER SYSTEM


    1. Turn the engine switch on (IG).

    2. Check that pressing the windshield deicer switch illuminates the indicator and warms the front windshield surface.

    3. Check that after approximately 15 minutes, the indicator light turns off and the windshield deicer deactivates.

      OK
      Windshield deicer system functioning normally.

    OK

    END (MULTI-MEDIA MODULE RECEIVER ASSEMBLY WAS DEFECTIVE)

    NG

    REPLACE MULTI-DISPLAY ASSEMBLY Click here

  8. INSPECT DEICER RELAY

    A01WWXUE76

    1. Remove the deicer 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 - 5 Battery voltage is not applied to terminals 1 and 2 10 kΩ or higher
      Battery voltage is applied to terminals 1 and 2 Below 1 Ω

    NG

    REPLACE DEICER RELAY

    OK

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


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

      A01WSV2E01

    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
      Deicer relay terminal 2 - Body ground Engine switch on (IG) 11 to 14 V
      Deicer 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
      Deicer relay terminal 1 - E36-9 (FDEF) Always Below 1 Ω
      Deicer relay terminal 1 - Body ground Always 10 kΩ or higher

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  10. CHECK HARNESS AND CONNECTOR (DEICER RELAY - WINDSHIELD DEICER WIRE)


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

      A01WRSQE01

    2. Disconnect the A23 windshield deicer wire connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      A23-1 (B) - Deicer relay terminal 3 Always Below 1 Ω
      Deicer relay terminal 3 - Body ground Always 10 kΩ or higher

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  11. CHECK HARNESS AND CONNECTOR (WINDSHIELD DEICER WIRE - BODY GROUND)

    A01WQNQE01
    *1 Front view of wire harness connector: (to Windshield Deicer Wire)

    1. Disconnect the A23 windshield deicer wire connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      A23-2 (E) - Body ground Always Below 1 Ω

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  12. CHECK WINDSHIELD DEICER WIRE

    A01WSQSE01
    *1 Front view of wire harness connector: (to Windshield Deicer Wire)

    1. Disconnect the A23 windshield deicer wire connector.

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

      Standard Voltage
      Tester Connection Switch Condition Specified Condition
      A23-1 (B) - A23-2 (E) Engine switch on (IG) and deicer switch on 11 to 14 V

    OK

    REPLACE WINDSHIELD GLASS Click here

    NG

    REPLACE AIR CONDITIONING AMPLIFIER Click here