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

A01FFU1E02

INSPECTION PROCEDURE

Note


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

  • If the 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 engine switch off.

    2. Connect the GTS to the DLC3.

    3. Turn the engine 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
      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

    CHECK HARNESS AND CONNECTOR (NO. 2 INTEGRATION RELAY - BATTERY AND BODY GROUND) 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

    B

    GO TO NAVIGATION SYSTEM Click here

    C

    GO TO AUDIO AND VISUAL SYSTEM Click here

    A

    REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY Click here

  4. CHECK HARNESS AND CONNECTOR (NO. 2 INTEGRATION RELAY - BATTERY AND BODY GROUND)


    1. A01FGG0E03
      Text in Illustration
      *a

      Front view of wire harness connector

      (to No. 2 Integration Relay)

      Disconnect the No. 2 integration relay connectors.

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

      Standard Voltage
      Tester Connection Condition Specified Condition
      2G-1 (ALT) - Body ground Always 11 to 14 V
      2B-8 (IG1A) - Body ground Engine switch on (IG) 11 to 14 V
      2B-8 (IG1A) - Body ground Engine switch off Below 1 V

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      2B-10 (GNDB) - Body ground Always Below 1 Ω
      2A-22 (GNDA) - Body ground Always Below 1 Ω

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

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


    1. Disconnect the N79 air conditioning amplifier assembly connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      N79-24 (FDEF) - 2A-25 (DEC) Always Below 1 Ω
      N79-24 (FDEF) - Body ground Always 10 kΩ or higher
      N79-1 (GND) - Body ground Always Below 1 Ω

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  6. CHECK NO. 2 INTEGRATION RELAY


    1. A01FEGNE05
      Text in Illustration
      *a

      Rear view of wire harness connector

      (to Air Conditioning Amplifier Assembly)

      Reconnect the 2A, 2B and 2G No. 2 integration relay connectors.

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

      Standard Voltage
      Tester Connection Switch Condition Specified Condition
      N79-24 (FDEF) - Body ground Engine switch off Below 1 V
      N79-24 (FDEF) - Body ground Engine switch on (IG) 11 to 14 V

    NG

    REPLACE NO. 2 INTEGRATION RELAY Click here

    OK

  7. CHECK AIR CONDITIONING AMPLIFIER ASSEMBLY


    1. A01FIZOE01
      Text in Illustration
      *a

      Component with harness connected

      (Air Conditioning Amplifier Assembly)

      Remove the air conditioning amplifier assembly Click here.

    2. Reconnect the air conditioning amplifier assembly connector.

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

      Standard Voltage
      Tester Connection Switch Condition Specified Condition
      N79-24 (FDEF) - N79-1 (GND)

      • Engine switch on (IG)

      • Windshield deicer switch on

      		 Below 2.2 V
      N79-24 (FDEF) - N79-1 (GND)

      • Engine switch on (IG)

      • Windshield deicer switch off

      		 11 to 14 V

    NG

    REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY Click here

    OK

  8. CHECK HARNESS AND CONNECTOR (NO. 2 INTEGRATION RELAY - WINDSHIELD GLASS)


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

    2. Disconnect the A70 windshield glass connector.

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

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

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  9. CHECK HARNESS AND CONNECTOR (WINDSHIELD GLASS - BODY GROUND)


    1. A01FIZKE05
      Text in Illustration
      *a

      Front view of wire harness connector

      (to Windshield Glass)

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      A70-3 (E) - Body ground Always Below 1 Ω

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  10. CHECK NO. 2 INTEGRATION RELAY


    1. A01FIZKE06
      Text in Illustration
      *a

      Front view of wire harness connector

      (to Windshield Glass)

      Reconnect the 2B No. 2 integration relay connector.

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

      Standard Voltage
      Tester Connection Switch Condition Specified Condition
      A70-2 (B2) - Body ground

      • Engine switch on (IG)

      • Windshield deicer switch on

      		 11 to 14 V
      A70-2 (B2) - Body ground

      • Engine switch on (IG)

      • Windshield deicer switch off

      		 Below 1 V
      A70-1 (B) - Body ground

      • Engine switch on (IG)

      • Windshield deicer switch on

      		 11 to 14 V
      A70-1 (B) - Body ground

      • Engine switch on (IG)

      • Windshield deicer switch off

      		 Below 1 V

    NG

    REPLACE NO. 2 INTEGRATION RELAY Click here

    OK

    REPLACE WINDSHIELD GLASS Click here