WINDSHIELD DEICER SYSTEM Windshield Deicer does not Operate

DESCRIPTION

When the defogger switch (deicer switch) on the air conditioning control assembly is pressed, the operation signal is transmitted to the air conditioning amplifier assembly. When the air conditioning amplifier assembly receives the signal, it turns on the DEICER relay to operate the windshield deicer system.

WIRING DIAGRAM

B00247ME01

CAUTION / NOTICE / HINT

Note


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

  • The windshield deicer system uses the LIN communication system. Inspect the communication function by following How to Proceed with Troubleshooting. Troubleshoot the windshield deicer 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 windshield 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. CHECK AIR CONDITIONING CONTROL ASSEMBLY


    1. Check that the defogger indicator (deicer indicator) illuminates when the defogger switch (deicer switch) is on.

      OK
      Defogger indicator (deicer indicator) illuminates.
      Result
      Proceed to
      OK
      NG

    NG

    REPLACE AIR CONDITIONING CONTROL ASSEMBLY Click here

    OK

  3. PERFORM ACTIVE TEST USING GTS


    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) DEICER relay 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

    CHECK HARNESS AND CONNECTOR (WINDSHIELD GLASS [WINDSHIELD DEICER] - BATTERY) Click here

    OK

  4. CHECK AIR CONDITIONING AMPLIFIER ASSEMBLY


    1. Replace the air conditioning amplifier assembly.

      Click here

    2. Check that the windshield deicer system operates normally.

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

    OK

    END (AIR CONDITIONING AMPLIFIER ASSEMBLY IS DEFECTIVE)

    NG

    REPLACE AIR CONDITIONING CONTROL ASSEMBLY Click here

  5. CHECK HARNESS AND CONNECTOR (WINDSHIELD GLASS [WINDSHIELD DEICER] - BATTERY)


    1. B0024IUC03
      *a

      Front view of wire harness connector

      (to Windshield Glass [Windshield Deicer])

      Disconnect the windshield glass (windshield deicer) connector.

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

      Standard Voltage
      Tester Connection Switch Condition Specified Condition
      A67-1 (B2) - Body ground Ignition switch ON, defogger switch (deicer switch) on 11 to 14 V
      Ignition switch ON, defogger switch (deicer switch) off Below 1 V
      A67-2 (B) - Body ground Ignition switch ON, defogger switch (deicer switch) on 11 to 14 V
      Ignition switch ON, defogger switch (deicer switch) off Below 1 V
      Result
      Proceed to
      OK
      NG

    NG

    INSPECT DEICER RELAY Click here

    OK

  6. CHECK HARNESS AND CONNECTOR (WINDSHIELD GLASS [WINDSHIELD DEICER] - BODY GROUND)


    1. B0024IUC04
      *a

      Front view of wire harness connector

      (to Windshield Glass [Windshield Deicer])

      Disconnect the windshield glass (windshield deicer) connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      A67-3 (E) - Body ground Always Below 1 Ω
      Result
      Proceed to
      OK
      NG

    OK

    REPLACE WINDSHIELD GLASS (WINDSHIELD DEICER) Click here

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

  7. INSPECT DEICER RELAY


    1. Remove the DEICER relay from the No. 6 instrument panel relay block assembly.

    2. Inspect the DEICER relay.

      Click here

      Result
      Proceed to
      OK
      NG

    NG

    REPLACE DEICER RELAY

    OK

  8. CHECK HARNESS AND CONNECTOR (DEICER RELAY - BATTERY)


    1. B00293IC08
      *a

      Front view of wire harness connector

      (to DEICER Relay)

      Remove the DEICER relay from the No. 6 instrument panel relay block assembly.

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

      Standard Voltage
      Tester Connection Switch Condition Specified Condition
      DEICER relay terminal 5 - Body ground Always 11 to 14 V
      DEICER relay terminal 1 - Body ground Ignition switch ON 11 to 14 V
      Result
      Proceed to
      OK
      NG

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  9. CHECK HARNESS AND CONNECTOR (DEICER RELAY - AIR CONDITIONING AMPLIFIER ASSEMBLY AND WINDSHIELD GLASS [WINDSHIELD DEICER])


    1. Remove the DEICER relay from the No. 6 instrument panel relay block assembly.

    2. Disconnect the A67 windshield glass (windshield deicer) connector.

    3. Disconnect the G33 air conditioning amplifier assembly connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      DEICER relay terminal 3 - A67-1 (B2) Always Below 1 Ω
      DEICER relay terminal 3 - A67-2 (B) Always Below 1 Ω
      DEICER relay terminal 2 - G33-18 (FDEF) Always Below 1 Ω
      DEICER relay terminal 3 or A67-1 (B2) Always 10 kΩ or higher
      DEICER relay terminal 3 or A67-2 (B) Always 10 kΩ or higher
      DEICER relay terminal 2 or G33-18 (FDEF) Always 10 kΩ or higher
      Result
      Proceed to
      OK
      NG

    OK

    REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY Click here

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR