WINDSHIELD DEICER SYSTEM Windshield Deicer does not Operate

DESCRIPTION

When the front deicer switch turns on, a front window deicer activation request signal from the air conditioning amplifier is sent via the CAN line to the multiplex network front light ECU (front controller). Then the multiplex network front light ECU (front controller) operates the windshield deicer.

WIRING DIAGRAM

A000U16E15

CAUTION / NOTICE / HINT

Note

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

Tech Tips

This circuit uses the CAN communication line. Before performing the inspection, check that the CAN communication system is functioning normally.

PROCEDURE


  1. PERFORM ACTIVE TEST USING GTS (DEICER RELAY [FRONT])


    1. Select the Active Test, using the GTS 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 / ON -
      OK
      Windshield deicer operates normally

    NG

    INSPECT DEICER RELAY Click here

    OK

  2. CHECK AIR CONDITIONING AMPLIFIER


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

    2. Check that the malfunction disappears.

      OK
      Malfunction disappears.

    OK

    END (AIR CONDITIONING AMPLIFIER IS DEFECTIVE)

    NG

  3. CHECK MULTIPLEX NETWORK FRONT LIGHT ECU


    1. Temporarily replace the multiplex network front light ECU (front controller) with a new or normally functioning one.

    2. Check that the malfunction disappears.

      OK
      Malfunction disappears.

    OK

    END (MULTIPLEX NETWORK FRONT LIGHT ECU [FRONT CONTROLLER] IS DEFECTIVE)

    NG

  4. 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. Check that the malfunction disappears.

      OK
      Malfunction disappears.

    OK

    END (MULTI-MEDIA MODULE RECEIVER IS DEFECTIVE)

    NG

    REPLACE ACCESSORY METER Click here

  5. INSPECT DEICER RELAY

    A000XU1E08

    1. Remove the DEICER relay from the No. 3 relay block.

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

      Standard resistance
      Tester Connection Condition Specified Condition
      3 - 5 When battery voltage is not applied between terminals 10 kΩ or higher
      When battery voltage is applied to terminals 1 and 2 Below 1 Ω

    NG

    REPLACE DEICER RELAY

    OK

  6. CHECK HARNESS AND CONNECTOR (DEICER RELAY - MULTIPLEX NETWORK FRONT LIGHT ECU [FRONT CONTROLLER] AND BATTERY)

    A000UJJE01
    *1 Rear view of wire harness connector: (to Multiplex Network Front Light ECU [Front Controller])
    *2 No. 3 Relay Block
    *3 DEICER Relay

    1. Remove the DEICER relay from the No. 3 relay block.

    2. Disconnect the A51 multiplex network front light ECU (front controller) 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 Always 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 - A51-13 (FDEF) Always Below 1 Ω
      DEICER relay terminal 1 - Body ground Always 10 kΩ or higher

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  7. CHECK HARNESS AND CONNECTOR (DEICER RELAY - WINDSHIELD GLASS AND BODY GROUND)

    A000VSYE01
    *1 Front view of wire harness connector: (to Windshield Glass)
    *2 No. 3 Relay Block
    *3 DEICER Relay

    1. Remove the DEICER relay from the No. 3 relay block.

    2. Disconnect the A30 windshield glass connector.

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

      Standard resistance
      Tester Connection Condition Specified Condition
      A30-1 (B2) - DEICER relay terminal 3 Always Below 1 Ω
      A30-2 (B) - DEICER relay terminal 3 Always Below 1 Ω
      A30-3 (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

  8. INSPECT WINDSHIELD GLASS


    1. Inspect the windshield glass Click here.

      Result
      Result Proceed to
      Windshield glass is broken A
      Windshield glass is not broken B

    B

    REPLACE WINDSHIELD GLASS Click here

    A

  9. CHECK MULTIPLEX NETWORK FRONT LIGHT ECU (FRONT CONTROLLER)


    1. Temporarily replace the multiplex network front light ECU (front controller) with a new or normally functioning one.

    2. Check that the malfunction disappears.

      OK
      Malfunction disappears.

    OK

    END (MULTIPLEX NETWORK FRONT LIGHT ECU [FRONT CONTROLLER] IS DEFECTIVE)

    NG

    REPLACE AIR CONDITIONING AMPLIFIER Click here