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 and UART communication line to the air conditioning amplifier assembly. Then the air conditioning amplifier assembly operates the windshield deicer. When the on signal from the switch is received, the DEICER relay is operated for 15 minutes. Also, if the off signal from the switch is received within 15 minutes, the DEICER relay operation is stopped.

WIRING DIAGRAM

A01EN7SE01

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 (DEICER RELAY [FRONT])


    1. Select the Active Test using the intelligent tester 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
      The windshield deicer system operates normally.
      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 DEICER RELAY Click here

    A

  3. CHECK NAVIGATION SYSTEM


    1. Check if the navigation system functioning normally Click here.

      OK
      Navigation system function properly.

    NG

    GO TO NAVIGATION SYSTEM Click here

    OK

  4. CHECK AIR CONDITIONING AMPLIFIER ASSEMBLY


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

    2. Turn the engine switch on (IG).

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

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

      OK
      Windshield deicer system functioning normally.

    NG

    CHECK MULTI-MEDIA MODULE RECEIVER ASSEMBLY Click here

    OK

    END (AIR CONDITIONING AMPLIFIER ASSEMBLY IS DEFECTIVE)

  5. CHECK MULTI-MEDIA MODULE RECEIVER ASSEMBLY


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

    2. Turn the engine switch on (IG).

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

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

      OK
      Windshield deicer system functioning normally.

    NG

    REPLACE MULTI-DISPLAY ASSEMBLY Click here

    OK

    END (MULTI-MEDIA MODULE RECEIVER ASSEMBLY IS DEFECTIVE)

  6. CHECK AUDIO AND VISUAL SYSTEM


    1. Check if the audio and visual system functioning normally Click here.

      OK
      Audio and visual system functioning normally.

    NG

    GO TO AUDIO AND VISUAL SYSTEM Click here

    OK

  7. CHECK AIR CONDITIONING AMPLIFIER ASSEMBLY


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

    2. Turn the engine switch on (IG).

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

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

      OK
      Windshield deicer system functioning normally.

    NG

    CHECK MULTI-MEDIA MODULE RECEIVER ASSEMBLY Click here

    OK

    END (AIR CONDITIONING AMPLIFIER ASSEMBLY IS DEFECTIVE)

  8. CHECK MULTI-MEDIA MODULE RECEIVER ASSEMBLY


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

    2. Turn the engine switch on (IG).

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

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

      OK
      Windshield deicer system functioning normally.

    NG

    REPLACE MULTI-DISPLAY ASSEMBLY Click here

    OK

    END (MULTI-MEDIA MODULE RECEIVER ASSEMBLY IS DEFECTIVE)

  9. INSPECT DEICER RELAY


    1. Remove the DEICER relay from the engine room relay block Click here.

    2. Inspect the DEICER relay Click here.


    NG

    REPLACE DEICER RELAY

    OK

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


    1. Remove the DEICER relay from the engine room relay block Click here.

    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 - E36-23 (FDEF) Always Below 1 Ω
      DEICER relay terminal 1 - Body ground Always 10 kΩ or higher

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  11. CHECK HARNESS AND CONNECTOR (WINDOW GLASS [WINDSHIELD DEICER WIRE] - DEICER RELAY AND BODY GROUND)


    • *1: w/o Heated Windshield Defroster System

    • *2: w/ Heated Windshield Defroster System


    1. Disconnect the A23*1 or A63*2 windshield deicer wire connector.

    2. Remove the DEICER relay from the engine room relay block Click here.

    3. Remove the HWD1, HWD2, HWD3 and HWD4 relays from the No. 2 engine room relay block Click here.*2

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

      Standard Resistance
      w/o Heated Windshield Defroster System:
      Tester Connection Condition Specified Condition
      A23-1 (B) - DEICER relay terminal 3 Always Below 1 Ω
      A23-2 (E) - Body ground Always Below 1 Ω
      DEICER relay terminal 3 - Body ground Always 10 kΩ or higher
      w/ Heated Windshield Defroster System:
      Tester Connection Condition Specified Condition
      A63-1 (B) - DEICER relay terminal 3 Always Below 1 Ω
      A63-2 (E) - Body ground Always Below 1 Ω
      DEICER relay terminal 3 - Body ground Always 10 kΩ or higher

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  12. CHECK WINDSHIELD GLASS (WINDSHIELD DEICER WIRE)


    1. A01EOCOE02
      Text in Illustration
      *A w/o Heated Windshield Defroster System
      *B w/ Heated Windshield Defroster System
      *a

      Front view of wire harness connector:

      (to Window Glass [Windshield Deicer Wire])

      Disconnect the A23*1 or A63*2 windshield deicer wire connector.


      • *1: w/o Heated Windshield Defroster System

      • *2: w/ Heated Windshield Defroster System

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

      Standard Voltage
      w/o Heated Windshield Defroster System:
      Tester Connection Switch Condition Specified Condition
      A23-1 (B) - A23-2 (E) Engine switch on (IG) and deicer switch on 11 to 14 V
      w/ Heated Windshield Defroster System:
      Tester Connection Switch Condition Specified Condition
      A63-1 (B) - A63-2 (E) Engine switch on (IG) and deicer switch on 11 to 14 V

    NG

    REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY Click here

    OK

    REPLACE WINDSHIELD GLASS (WINDSHIELD DEICER WIRE) Click here