WINDSHIELD DEICER SYSTEM Windshield Deicer does not Operate

DESCRIPTION

The integration control and panel assembly transmits the operation signal to the air conditioning amplifier assembly via the CAN communication line.

WIRING DIAGRAM

A01MGFZE01

CAUTION / NOTICE / HINT

Note


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

  • If the auxiliary battery voltage is low, the windshield deicer system may not operate. Refer to Data List for the power steering system.

    Click here

    Click here

  • The power window control system uses the CAN communication system. Inspect the communication function by following How to Proceed with Troubleshooting. Troubleshoot the power window control system after confirming that the communication system is functioning properly.

    Click here

PROCEDURE


  1. CHECK AIR CONDITIONING SYSTEM


    1. Check the air conditioning system.

      Click here

      Tech Tips

      Both the window deicer system operation signal and air conditioning system operation signal are transmitted to the air conditioning amplifier assembly via the same communication line.

      OK
      The air conditioning system operates normally.
      Result
      Proceed to
      OK
      NG

    NG

    GO TO AIR CONDITIONING SYSTEM Click here

    OK

  2. PERFORM ACTIVE TEST USING GTS (DEICER RELAY (FRONT))


    1. Using the GTS, perform the Active Test.

      Click here


      Body Electrical > Air Conditioner > Active Test
      Tester Display Measurement Item Control Range Diagnostic Note
      Deicer Relay (Front) Windshield glass (windshield deicer wire) OFF or ON -

      Body Electrical > Air Conditioner > Active Test
      Tester Display
      Deicer Relay (Front)
      OK
      The windshield deicer system operates normally.
      Result
      Proceed to
      OK
      NG

    NG

    INSPECT FR WIPER DEICER RELAY (DEICER RELAY) Click here

    OK

  3. CHECK AIR CONDITIONING AMPLIFIER ASSEMBLY


    1. Replace the air conditioning amplifier assembly with a new or normally functioning one.

      Click here

    2. Check that the window deicer system operates normally.

      OK
      The window deicer system operates normally.
      Result
      Proceed to
      OK
      NG

    OK

    END (AIR CONDITIONING AMPLIFIER ASSEMBLY IS DEFECTIVE)

    NG

    REPLACE INTEGRATION CONTROL AND PANEL ASSEMBLY

  4. INSPECT FR WIPER DEICER RELAY (DEICER RELAY)


    1. Remove the front wiper deicer relay (DEICER RELAY) from the No. 3 motor compartment relay block.

    2. Inspect the front wiper deicer relay (DEICER RELAY).

      Click here

      Result
      Proceed to
      OK
      NG

    NG

    REPLACE FR WIPER DEICER RELAY (DEICER RELAY)

    OK

  5. CHECK HARNESS AND CONNECTOR (FRONT WIPER DEICER RELAY (DEICER RELAY) - BATTERY)


    1. A01MJWFC02
      *1 No. 3 Motor Compartment Relay Block
      *2 Front Wiper Deicer Relay (DEICER RELAY) Holder

      Remove the front wiper deicer relay from the No. 3 motor compartment relay block.

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

      Standard Voltage
      Tester Connection Switch Condition Specified Condition
      Front wiper deicer relay terminal 5 - Body ground Power switch off 11 to 14 V
      Front wiper deicer relay terminal 1 - Body ground Power switch on (IG) 11 to 14 V
      Result
      Proceed to
      OK
      NG

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  6. CHECK HARNESS AND CONNECTOR (FRONT WIPER DEICER RELAY (DEICER RELAY) - AIR CONDITIONING AMPLIFIER ASSEMBLY)


    1. Disconnect the A64 windshield glass (windshield deicer wire) connector.

    2. Disconnect the G43 air conditioning amplifier assembly connector.

    3. Remove the front wiper deicer relay from the No. 3 motor compartment relay block.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      Front wiper deicer relay (DEICER RELAY) terminal 2 - G43-36 (FDEF) Always Below 1 Ω
      Front wiper deicer relay (DEICER RELAY) terminal 2 or G43-36 (FDEF) - Body ground Always 10 kΩ or higher
      Result
      Proceed to
      OK
      NG

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  7. CHECK AIR CONDITIONING AMPLIFIER ASSEMBLY


    1. Reinstall the defogger relay.

    2. Reconnect the G43 air conditioning amplifier assembly connector.

    3. Remove the air conditioning amplifier assembly with the connectors still connected.

    4. A01MJTPC08
      *a

      Component with harness connected

      (Air Conditioning Amplifier Assembly)

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

      Standard Voltage
      Tester Connection Condition Specified Condition
      G43-36 (FDEF) - G43-14 (GND) Power switch on (IG), Outer mirror heater switch assembly on Below 1 V
      G43-36 (FDEF) - G43-14 (GND) Power switch on (IG), Outer mirror heater switch assembly off 11 to 14 V
      Result
      Proceed to
      OK
      NG

    NG

    REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY Click here

    OK

  8. CHECK HARNESS AND CONNECTOR (WINDSHIELD GLASS (WINDSHIELD DEICER WIRE) - FRONT WIPER DEICER RELAY (DEICER RELAY) AND BODY GROUND)


    1. Disconnect the A64 windshield glass (windshield deicer relay) connector.

    2. Remove the front wiper deicer relay (DEICER RELAY) connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      Front wiper deicer relay (DEICER RELAY) terminal 3 - A64-4 (B2) Always Below 1 Ω
      Front wiper deicer relay (DEICER RELAY) terminal 3 - A64-5 (B) Always Below 1 Ω
      A64-4 (B2) or Front wiper deicer relay (DEICER RELAY) terminal 3 - Body ground Always 10 kΩ or higher
      A64-5 (B) or Front wiper deicer relay (DEICER RELAY) terminal 3 - Body ground Always 10 kΩ or higher
      Result
      Proceed to
      OK
      NG

    OK

    REPLACE WINDSHIELD GLASS (WINDSHIELD DEICER WIRE) Click here

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR