HEATED WINDSHIELD DEFROSTER SYSTEM Heated Windshield Defroster System does not operate

DESCRIPTION


WIRING DIAGRAM

B000KM5E09

INSPECTION PROCEDURE

Note


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

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

  • The heated windshield defroster system uses the CAN communication system. First, confirm that there are no malfunctions in the communication system by checking the communication function of the CAN communication system. Refer to the How to Proceed with Troubleshooting procedure Click here.

  • If the ambient temperature is 5°C (41°F) or higher, or if a malfunction of the ambient temperature sensor (thermistor assembly) is detected, the HWD1 relay will be deactivated and the front window deicer switch indicator light will blink.

PROCEDURE


  1. CHECK AIR CONDITIONING SYSTEM


    1. (a) Check that the air conditioning system can be operated using the remote touch.

      Tech Tips

      HINT: Both the heated windshield defroster system operation signal and air conditioning system operation signal are transmitted to the air conditioning amplifier assembly through same communication line.


    NG

    GO TO AIR CONDITIONING SYSTEM Click here

    OK

  2. CHECK HEATED WINDSHIELD DEFROSTER SYSTEM


    1. Activate the heated windshield defroster system and check the symptoms.

      Result
      Result Proceed to
      Both heated windshield defrosters do not warm up. A
      Only No. 1 heated windshield defroster does not warm up. B
      Only No. 2 heated windshield defroster does not warm up. C

    B

    CHECK HARNESS AND CONNECTOR (WINDSHIELD GLASS (NO. 1 HEATED WINDSHIELD DEFROSTER) - HWD NO. 1 RELAY AND BODY GROUND) Click here

    C

    INSPECT HWD2 RELAY Click here

    A

  3. PERFORM ACTIVE TEST USING GTS


    1. Connect the GTS to the DLC3.

    2. Turn the engine switch on (IG).

    3. Turn the GTS on.

    4. Enter the following menus: Body Electrical / Air Conditioner / Active Test.

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

      Air Conditioner
      Tester Display Test Part Control Range Diagnostic Note
      HWD Relay HWD relay OFF or ON -
      OK
      The heated windshield defroster system operates normally.

    NG

    INSPECT HWD1 RELAY Click here

    OK

  4. INSPECT FRONT WINDOW DEICER SWITCH


    1. Remove the front window deicer switch Click here.

    2. Inspect the front window deicer switch Click here.


    NG

    REPLACE FRONT WINDOW DEICER SWITCH Click here

    OK

  5. CHECK HARNESS AND CONNECTOR (FRONT WINDOW DEICER SWITCH - POWER SUPPLY)

    B000L2UE02
    Text in Illustration
    *a

    Front view of wire harness connector

    (to Front Window Deicer Switch)

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

      Standard Voltage
      Tester Connection Condition Specified Condition
      I195-3 (IG) - Body ground Engine switch off Below 1 V
      I195-3 (IG) - Body ground Engine switch on (IG) 11 to 14 V

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  6. CHECK HARNESS AND CONNECTOR (FRONT WINDOW DEICER SWITCH - AIR CONDITIONING AMPLIFIER ASSEMBLY)


    1. Disconnect the I77 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
      I195-7 (D) - I77-23 (IND) Always Below 1 Ω
      I195-7 (D) or I77-23 (IND) - Body ground Always 10 kΩ or higher
      I195-6 (E) - I77-24 (DFAC) Always Below 1 Ω
      I195-6 (E) or I77-24 (DFAC) - Body ground Always 10 kΩ or higher

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

    REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY Click here

  7. INSPECT HWD1 RELAY


    1. Inspect the HWD1 relay Click here.


    NG

    REPLACE HWD1 RELAY

    OK

  8. CHECK HARNESS AND CONNECTOR (HWD NO. 1 RELAY - POWER SUPPLY)


    1. B000LLPE01
      Text in Illustration
      *a HWD No. 1 Relay Holder

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

      Standard Voltage
      Tester Connection Condition Specified Condition
      HWD1 relay holder terminal-2 - Body ground Engine switch off Below 1 V
      HWD1 relay holder terminal-2 - Body ground Engine switch on (IG) 11 to 14 V
      HWD1 relay holder terminal-5 - Body ground Always 11 to 14 V

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  9. CHECK HARNESS AND CONNECTOR (HWD NO. 1 RELAY - AIR CONDITIONING AMPLIFIER ASSEMBLY)


    1. B000LLPE01
      Text in Illustration
      *a HWD No. 1 Relay Holder

      Disconnect the I77 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
      HWD1 relay holder terminal-1 - I77-19 (FDEF) Always Below 1 Ω
      HWD1 relay holder terminal-1 or I77-19 (FDEF) - Body ground Always 10 kΩ or higher

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  10. CHECK HARNESS AND CONNECTOR (HWD NO. 1 RELAY - HWD NO. 2 RELAY)


    1. Disconnect the A82 windshield glass (No. 1 heated windshield defroster) connector.

    2. Remove the HWD No. 2 relay from the No. 2 engine room relay block and junction block assembly.

    3. B000LLPE01
      Text in Illustration
      *a HWD No. 1 Relay and HWD No. 2 Relay Holder

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      HWD1 relay holder terminal-3 - HWD2 relay holder terminal-2 Always Below 1 Ω
      HWD1 relay holder terminal-3 or HWD2 relay holder terminal-2 - Body ground Always 10 kΩ or higher

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

    REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY Click here

  11. CHECK HARNESS AND CONNECTOR (WINDSHIELD GLASS (NO. 1 HEATED WINDSHIELD DEFROSTER) - HWD NO. 1 RELAY AND BODY GROUND)


    1. Remove the HWD No. 1 relay and HWD No. 2 relay from the No. 2 engine room relay block and junction block assembly.

    2. Disconnect the A82 windshield glass (No. 1 heated windshield defroster) connector.

    3. B000LLPE01
      Text in Illustration
      *a HWD No. 1 Relay and HWD No. 2 Relay Holder

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      HWD1 relay holder terminal-3 - A82-1 (B) Always Below 1 Ω
      HWD1 relay holder terminal-3 or A82-1 (B) - Body ground Always 10 kΩ or higher
      A82-2 (E) - Body ground Always Below 1 Ω

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

    REPLACE WINDSHIELD GLASS (HEATED WINDSHIELD DEFROSTER) Click here

  12. INSPECT HWD2 RELAY


    1. Inspect the HWD2 relay Click here.


    NG

    REPLACE HWD2 RELAY Click here

    OK

  13. CHECK HARNESS AND CONNECTOR (HWD NO. 2 RELAY - POWER SUPPLY)


    1. B000LLPE01
      Text in Illustration
      *a HWD No. 2 Relay Holder

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

      Standard Voltage
      Tester Connection Condition Specified Condition
      HWD2 relay holder terminal-5 - Body ground Always 11 to 14 V

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  14. CHECK HARNESS AND CONNECTOR (HWD NO. 2 RELAY - HWD NO. 1 RELAY AND BODY GROUND)


    1. Remove the HWD1 relay from the No. 2 engine room relay block and junction block assembly.

    2. B000LLPE01
      Text in Illustration
      *a HWD No. 1 Relay and HWD No. 2 Relay Holder

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      HWD1 relay holder terminal-3 - HWD2 relay holder terminal-2 Always Below 1 Ω
      HWD2 relay holder terminal-1 - Body ground Always Below 1 Ω

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  15. CHECK HARNESS AND CONNECTOR (WINDSHIELD GLASS (NO. 2 HEATED WINDSHIELD DEFROSTER) - HWD NO. 2 RELAY AND BODY GROUND

    B000LLPE01
    Text in Illustration
    *a HWD No. 2 Relay Holder

    1. Disconnect the A83 windshield glass (heated windshield defroster No. 2) connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      HWD2 relay holder terminal-3 - A83-1 (B) Always Below 1 Ω
      HWD2 relay holder terminal-3 or A83-1 (B) - Body ground Always 10 kΩ or higher
      A83-2 (E) - Body ground Always Below 1 Ω

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

    REPLACE WINDSHIELD GLASS (HEATED WINDSHIELD DEFROSTER) Click here