HEATED WINDSHIELD DEFROSTER SYSTEM Heated Windshield Defroster System does not operate

DESCRIPTION

When the front window deicer switch is operated, the operation signal is transmitted to the air conditioning amplifier assembly directly. When the air conditioning amplifier assembly receives the signal, it turns on the HWD NO.1 relay, HWD NO.2 relay, HWD NO.3 relay and HWD NO.4 relay to operate the heated windshield defroster system.

WIRING DIAGRAM

B001H1TE01
B001ILXE01

CAUTION / NOTICE / HINT

Note


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

  • 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 HWD NO. 3 relay will be deactivated and the front window deicer switch indicator light will blink.

  • As the door control battery is installed between the vehicle battery and main body ECU (multiplex network body ECU), first perform the inspections in On-Vehicle Inspection to confirm that there are no malfunctions in the power source circuit for the main body ECU (multiplex network body ECU) before performing this troubleshooting procedure.*

    *: w/ Door Control Battery

PROCEDURE


  1. CHECK HEATED WINDSHIELD DEFROSTER SYSTEM


    1. Check if the heated windshield defroster is operating.

      Click here

      Result
      Result Proceed to
      None of the heated windshield defroster operate. A
      Some of the heated windshield defroster do not operate B

    B

    INSPECT HWD NO.1 RELAY, HWD NO.2 RELAY, HWD NO.3 RELAY, HWD NO.4 RELAY Click here

    A

  2. INSPECT FRONT WIPER DEICER SWITCH


    1. Remove the front wiper deicer switch.

      Click here

    2. Inspect the front wiper deicer switch.

      Click here

      Result
      Proceed to
      OK
      NG

    NG

    REPLACE FRONT WIPER DEICER SWITCH Click here

    OK

  3. CHECK WIRE HARNESS AND CONNECTOR (FRONT WIPER DEICER SWITCH - AIR CONDITIONING AMPLIFIER ASSEMBLY AND BATTERY)


    1. B001D1IC01
      *a

      Front view of wire harness connector

      (to Front Wiper Deicer Switch)

      Disconnect the front wiper switch connector.

    2. Disconnect the G24 air conditioning amplifier assembly connector.

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

      Standard Voltage
      Tester Connection Condition Specified Condition
      G219-5 (IG) - Body ground Engine switch off Below 1 V
      Engine switch on (IG) 11 to 14 V

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      G219-2 (E) - G24-5 (SW1) Always Below 1 Ω
      G219-4 (D) - G24-11 (FDFI) Always Below 1 Ω
      G219-2 (E) or G24-5 (SW 1) - Body ground Always 10 kΩ or higher
      G219-4 (D) or G24-11 (FDFI) - Body ground Always 10 kΩ or higher
      Result
      Proceed to
      OK
      NG

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  4. INSPECT DEICER RELAY


    1. Remove the DEICER relay from the No. 5 relay block.

    2. Inspect the DEICER relay.

      Click here

      Result
      Proceed to
      OK
      NG

    NG

    REPLACE DEICER RELAY

    OK

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


    1. B001CIUC01
      *a

      Front view of wire harness connector

      (to DEICER Relay)

      Remove the DEICER relay from the No. 5 relay block.

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

      Standard Voltage
      Tester Connection Condition Specified Condition
      DEICER relay terminal 3 - Body ground Always 11 to 14 V
      DEICER relay terminal 2 - Body ground Engine 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 (DEICER RELAY - AIRCONDITIONING AMPLIFIER ASSEMBLY, HWD NO.1 RELAY, WINDSHIELD GLASS AND BODY GROUND)


    1. Disconnect the A123 windshield glass (heated windshield defroster) connector.

    2. Disconnect the G25 air conditioning amplifier assembly connector.

    3. Remove the DEICER relay from the No. 5 relay block.

    4. Remove the HWD NO.1 relay and HWD NO.2 relay from the No. 5 relay block.

    5. Remove the HWD NO.3 relay and HWD NO.4 relay from the No. 1 engine room relay block and No. 1 junction block assembly.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      DEICER relay terminal 5 - A123-2 (B) Always Below 1 Ω
      A123-1 (E) - Body ground Always Below 1 Ω
      DEICER relay terminal 1 - G25-40 (FDEF) Always Below 1 Ω
      DEICER relay terminal 5 - HWD NO.1 relay terminal 2 Always Below 1 Ω
      DEICER relay terminal 5 or A123-2 (B) - Body ground Always 10 kΩ or higher
      DEICER relay terminal 1 or G25-40 (FDEF) - Body ground Always 10 kΩ or higher
      DEICER relay terminal 5 or HWD NO.1 relay terminal 2 - Body ground Always 10 kΩ or higher
      Result
      Proceed to
      OK
      NG

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  7. PERFORM ACTIVE TEST USING GTS (HWD RELAY)


    1. Using the GTS, perform the Active Test.

      Click here

      Air Conditioner
      Tester Display Measurement Item Control Range Diagnostic Note
      HWD Relay Windshield glass (windshield deicer wire) OFF or ON -
      OK
      The heated windshield defroster system operates normally.
      Result
      Proceed to
      OK
      NG

    OK

    REPLACE WINDSHIELD GLASS (HEATED WINDSHIELD DEFROSTER) Click here

    NG

    REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY Click here

  8. INSPECT HWD NO.1 RELAY, HWD NO.2 RELAY, HWD NO.3 RELAY, HWD NO.4 RELAY


    1. HWD NO.1 relay:


      1. Remove the HWD NO.1 relay from the No. 5 relay block.

      2. Inspect the HWD NO.1 relay.

        Click here

    2. HWD NO.2 relay:


      1. Remove the HWD NO.2 relay from the No. 5 relay block.

      2. Inspect the HWD NO.2 relay.

        Click here

    3. HWD NO.3 relay:


      1. Remove the HWD NO.3 relay from the No. 1 engine room relay block and No. 1 junction block assembly.

      2. Inspect the HWD NO.3 relay.

        Click here

    4. HWD NO.4 relay:


      1. Remove the HWD NO.4 relay from the No. 1 engine room relay block and No. 1 junction block assembly.

      2. Inspect the HWD NO.4 relay.

        Click here

      Result
      Proceed to
      OK
      NG

    NG

    REPLACE HWD NO.1 RELAY, HWD NO.2 RELAY, HWD NO.3 RELAY, HWD NO.4 RELAY

    OK

  9. CHECK WIRE HARNESS AND CONNECTOR (HWD NO.1 RELAY - WINDSHIELD GLASS [HEATED WINDSHIELD DEFROSTER]) BATTERY AND BODY GROUND)


    1. B001IE5C01
      *a HWD NO.1 Relay Holder

      Disconnect A108 windshield glass (heated windshield defroster) connector.

    2. Remove the HWD NO.1 relay from the No. 5 relay block.

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

      Standard Voltage
      Tester Connection Condition Specified Condition
      HWD NO.1 relay holder terminal 5 - Body ground Always 11 to 14 V
      HWD NO.1 relay holder terminal 2 - Body ground Front wiperdeicer switch on 11 to 14 V

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      HWD NO.1 relay holder terminal 3 - A108-4 (B) Always Below 1 Ω
      HWD NO.1 relay holder terminal 4 - A108-1 (E) Always Below 1 Ω
      HWD NO.1 relay holder terminal 1 - Body ground Always Below 1 Ω
      HWD NO.1 relay holder terminal 4 - Body ground Always Below 1 Ω
      A108-1 (E) - Body ground Always Below 1 Ω
      HWD NO.1 relay holder terminal 3 or A108-4 (B) - Body ground Always 10 kΩ higher
      Result
      Proceed to
      OK
      NG

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  10. CHECK WIRE HARNESS AND CONNECTOR (HWD NO.2 RELAY - WINDSHIELD GLASS [HEATED WINDSHIELD DEFROSTER] BATTERY AND BODY GROUND)


    1. B001F9SC01
      *a HWD NO.2 Relay Holder

      Disconnect A108 and A123 windshield glass (heated windshield defroster) connectors.

    2. Remove the HWD NO.2 relay from the No. 5 relay block.

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

      Standard Voltage
      Tester Connection Condition Specified Condition
      HWD NO.2 relay holder terminal 5 - Body ground Always 11 to 14 V
      HWD NO.2 relay holder terminal 2 - Body ground Front wiperdeicer switch on 11 to 14 V

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      HWD NO.2 relay holder terminal 3 - A123-4 (B) Always Below 1 Ω
      HWD NO.2 relay holder terminal 4 - A108-3 (E) Always Below 1 Ω
      HWD NO.2 relay holder terminal 4 - Body ground Always Below 1 Ω
      HWD NO.2 relay holder terminal 1 - Body ground Always Below 1 Ω
      A108-3 (E) - Body ground Always Below 1 Ω
      HWD NO.2 relay holder terminal 3 or A123-4 (B) - Body ground Always 10 kΩ higher
      Result
      Proceed to
      OK
      NG

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  11. CHECK WIRE HARNESS AND CONNECTOR (HWD NO.3 RELAY - WINDSHIELD GLASS [HEATED WINDSHIELD DEFROSTER] BATTERY AND BODY GROUND)

    B001HTWC01
    *A except 1GD-FTV *B for 1GD-FTV
    *a HWD NO.3 Relay Holder - -

    1. Disconnect A109 windshield glass (heated windshield defroster) connector.

    2. Remove the HWD NO.3 relay from the No. 1 engine room relay block and No. 1 junction block assembly.

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

      Standard Voltage
      Tester Connection Condition Specified Condition
      HWD NO.3 relay holder terminal 5 - Body ground Always 11 to 14 V
      HWD NO.3 relay holder terminal 2 - Body ground Front wiperdeicer switch on 11 to 14 V

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      HWD NO.3 relay holder terminal 3 - A109-1 (B) Always Below 1 Ω
      HWD NO.3 relay holder terminal 4 - A109-2 (E) Always Below 1 Ω
      HWD NO.3 relay holder terminal 4 - Body ground Always Below 1 Ω
      HWD NO.3 relay holder terminal 1 - Body ground Always Below 1 Ω
      A109-2 (E) - Body ground Always Below 1 Ω
      HWD NO.3 relay holder terminal 3 or A109-1 (B) - Body ground Always 10 kΩ higher
      Result
      Proceed to
      OK
      NG

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  12. CHECK WIRE HARNESS AND CONNECTOR (HWD NO.4 RELAY - WINDSHIELD GLASS [HEATED WINDSHIELD DEFROSTER] BATTERY AND BODY GROUND)

    B001EZDC01
    *A except 1GD-FTV *B for 1GD-FTV
    *a HWD NO.4 Relay Holder - -

    1. Disconnect A109 windshield glass (heated windshield defroster) connector.

    2. Remove the HWD NO.4 relay from the No. 1 engine room relay block and No. 1 junction block assembly.

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

      Standard Voltage
      Tester Connection Condition Specified Condition
      HWD NO.4 relay holder terminal 5 - Body ground Always 11 to 14 V
      HWD NO.4 relay holder terminal 2 - Body ground Front wiperdeicer switch on 11 to 14 V

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      HWD NO.4 relay holder terminal 3 - A109-3 (B) Always Below 1 Ω
      HWD NO.4 relay holder terminal 4 - A109-4 (E) Always Below 1 Ω
      HWD NO.4 relay holder terminal 1 - Body ground Always Below 1 Ω
      HWD NO.4 relay holder terminal 4 - Body ground Always Below 1 Ω
      A109-4 (E) - Body ground Always Below 1 Ω
      HWD NO.4 relay holder terminal 3 or A109-3 (B) - Body ground Always 10 kΩ higher
      Result
      Proceed to
      OK
      NG

    OK

    REPLACE WINDSHIELD GLASS (HEATED WINDSHIELD DEFROSTER) Click here

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR