WINDSHIELD DEICER SYSTEM Windshield Deicer does not Operate

DESCRIPTION

When the windshield deicer switch is operated, the operation signal is transmitted to multi-media receiver assembly. Multi-media receiver assembly transmit the operation signal to the air conditioning amplifier assembly via CAN communication line. When the air conditioning amplifier assembly receives the signal, it turns on the No. 2 integration relay to operate the windshield deicer.

WIRING DIAGRAM

A000ON2E02

CAUTION / NOTICE / HINT

Note


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

  • If the auxiliary battery voltage becomes low, windshield deicer operation is canceled to prioritize supplying power to the power steering system Click here.

PROCEDURE


  1. CHECK CAN COMMUNICATION SYSTEM


    1. Use the GTS to check if the CAN communication system is functioning normally.


      Result
      Result Proceed to
      CAN 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 GTS (DEICER RELAY [FRONT])


    1. Turn the power switch off.

    2. Connect the GTS to the DLC3.

    3. Turn the power switch on (IG).

    4. Turn the GTS on.

    5. Enter the following menus: Body Electrical / Air Conditioner / Active Test Click here.

    6. Perform the Active Test according to the display on the GTS.

      Air Conditioner (Air Conditioning Amplifier Assembly)
      Tester Display Test Part Control Range Diagnostic Note
      Deicer Relay (Front) Windshield deicer ON/OFF -
      Result
      Result Proceed to
      Windshield deicer operates A
      Windshield deicer does not operate B

    B

    INSPECT NO. 2 INTEGRATION RELAY Click here

    A

  3. CHECK AVC-LAN COMMUNICATION LINE


    1. Check the AVC-LAN communication function to ensure there are no malfunctions in the communication system.


      OK
      The AVC-LAN communication function operates normally.
      Result
      Result Proceed to
      OK A
      NG (w/ Navigation System) B
      NG (w/o Navigation System) C

    A

    REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY Click here

    B

    GO TO NAVIGATION SYSTEM Click here

    C

    GO TO AUDIO AND VISUAL SYSTEM Click here

  4. INSPECT NO. 2 INTEGRATION RELAY


    1. Disconnect the 1A, 1B, 1C and 1G No. 2 integration relay connector.

    2. Inspect the No. 2 integration relay. Refer to the on-vehicle inspection Click here.


    NG

    REPLACE NO. 2INTEGRATION RELAY

    OK

  5. CHECK HARNESS AND CONNECTOR (NO. 2 INTEGRATION RELAY - AIR CONDITIONING AMPLIFIER, BATTERY AND BODY GROUND)


    1. Disconnect the 1A, 1B and 1G No. 2 integration relay connector.

    2. Disconnect the N78 air conditioning amplifier assembly connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      1A-25(DEC) - N78-24 (FDEF) Always Below 1 Ω
      1A-25(DEC) - Body ground Always 10 kΩ or higher
      N78-1 (GND) - Body ground Always Below 1 Ω

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

      Standard Voltage
      Tester Connection Condition Specified Condition
      1G-1(ALT) - Body ground Always 11 to 14 V
      1B-8(IG1A) - Body ground Power switch off Below 1 V
      1B-8(IG1A) - Body ground Power switch on (IG) 11 to 14 V

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  6. CHECK HARNESS AND CONNECTOR (WINDSHIELD GLASS - NO. 2 INTEGRATION RELAY AND BODY GROUND)


    1. Disconnect the A70 windshield glass connector.

    2. Disconnect the 1B No. 2 integration relay connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      A70-1 (B) - 1B-5(DECR) Always Below 1 Ω
      A70-2 (B2) - 1B-1(DECL) Always Below 1 Ω
      A70-3 (E) - Body ground Always Below 1 Ω
      A70-1 (B) - Body ground Always 10 kΩ or higher
      A70-2 (B2) - Body ground Always 10 kΩ or higher

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  7. CHECK AIR CONDITIONING AMPLIFIER ASSEMBLY


    1. A000T5OE02
      Text in Illustration
      *a

      Component with harness connected

      (Air Conditioning Amplifier Assembly)

      Remove the air conditioning amplifier assembly connector still connected Click here.

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

      Standard Voltage
      Tester Connection Switch Condition Specified Condition
      N78-24 (FDEF) - N78-1 (GND)

      • Power switch on (IG)

      • Windshield deicer switch on

      		 Below 2.2 V
      N78-24 (FDEF) - N78-1 (GND)

      • Power switch on (IG)

      • Windshield deicer switch off

      		 11 to 14 V

    OK

    REPLACE WINDSHIELD GLASS Click here

    NG

    REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY Click here