WINDSHIELD DEICER SYSTEM Windshield Deicer does not Operate

DESCRIPTION

When the front wiper deicer switch assembly 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 semiconductor pwr integration ECU to operate the windshield deicer system.

WIRING DIAGRAM

B0072QZE13

CAUTION / NOTICE / HINT

Note


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

  • If the battery voltage is low, the windshield deicer system may not operate. When "Operation of Electrical Items Restricted." is not displayed on the multi-information display in the combination meter assembly, check the Data List item "Battery Control Count (Body ECU)".

    Click here

PROCEDURE


  1. 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.


      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

    CHECK SEMICONDUCTOR POWER INTEGRATION ECU Click here

    OK

  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 HARNESS AND CONNECTOR (FRONT WIPER DEICER SWITCH - IG POWER SUPPLY)


    1. B0075FTC03
      *a

      Front view of wire harness connector

      (to Front Wiper Deicer Switch)

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

      Standard Voltage
      Tester Connection Condition Specified Condition
      O89-6 (IG) - Body ground Engine switch off Below 1 V
      O89-6 (IG) - Body ground Engine switch on (IG) 11 to 14 V
      Result
      Proceed to
      OK
      NG

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

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


    1. Disconnect the O9 and O10 air conditioning amplifier assembly connectors.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      O89-10 (IND-) - O9-17 (SWL2) Always Below 1 Ω
      O89-10 (IND-) or O9-17 (SWL2) - Body ground Always 10 kΩ or higher
      O89-9 (ECU) - O10-28 (SW6) Always Below 1 Ω
      O89-9 (ECU) or O10-28 (SW6) - Body ground 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

  5. CHECK SEMICONDUCTOR POWER INTEGRATION ECU


    1. Using a voltmeter, check the signal reading of the semiconductor pwr integration ECU.

      Click here

      OK
      Output signal reading is normal.
      Result
      Proceed to
      OK
      NG

    NG

    INSPECT SEMICONDUCTOR POWER INTEGRATION ECU (RESULTS OF SIGNAL READING CHECK) Click here

    OK

  6. CHECK HARNESS AND CONNECTOR (SEMICONDUCTOR PWR INTEGRATION ECU POWER SOURCE AND BODY GROUND)


    1. Remove the semiconductor pwr integration ECU from the No. 2 engine room relay block and No. 2 junction block assembly.

      Click here

      B0076MIC01
      *a

      Component without semiconductor pwr integration ECU

      (No. 2 Engine Room Relay Block and No. 2 Junction Block Assembly)

      		 - -

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

      Standard Voltage
      Tester Connection Condition Specified Condition
      2B-1 (BATT) - Body ground Always 11 to 14 V
      2A-1 (ALT) - Body ground Always 11 to 14 V

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      2D-14 (GND1) - Body ground Always Below 1 Ω
      2G-5 (GND2) - Body ground Always Below 1 Ω
      Result
      Proceed to
      OK
      NG

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  7. CHECK HARNESS AND CONNECTOR (AIR CONDITIONING AMPLIFIER ASSEMBLY - SEMICONDUCTOR PWR INTEGRATION ECU)


    1. Disconnect the O9 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
      O9-24 (FDEF) - 2D-6 (-S) Always Below 1 Ω
      O9-24 (FDEF) or 2D-6 (-S) - Body ground Always 10 kΩ or higher
      Result
      Proceed to
      OK
      NG

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  8. CHECK SEMICONDUCTOR POWER INTEGRATION ECU


    1. Install the semiconductor pwr integration ECU.

      Click here

    2. B0075M4C11
      *a

      Front view of wire harness connector

      (to Air Conditioning Amplifier Assembly)

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

      Standard Voltage
      Tester Connection Condition Specified Condition
      O9-24 (FDEF) - Body ground Engine switch on (IG), Front wiper deicer switch off 11 to 14 V
      Result
      Proceed to
      OK
      NG

    NG

    REPLACE SEMICONDUCTOR POWER INTEGRATION ECU Click here

    OK

  9. CHECK AIR CONDITIONING AMPLIFIER ASSEMBLY


    1. Reconnect the O9 air conditioning amplifier assembly connector.

    2. B0077A1C24
      *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
      O9-24 (FDEF) - O9-1 (GND) Engine switch on (IG), Front wiper deicer switch on Below 2.2 V
      O9-24 (FDEF) - O9-1 (GND) Engine switch on (IG), Front wiper deicer switch off 11 to 14 V
      Result
      Proceed to
      OK
      NG

    NG

    REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY Click here

    OK

  10. CHECK HARNESS AND CONNECTOR (SEMICONDUCTOR PWR INTEGRATION ECU - WINDSHIELD GLASS (WINDSHIELD DEICER WIRE))


    1. Disconnect the 2E semiconductor pwr integration ECU connector.

    2. Disconnect the A77 windshield glass (windshield deicer wire) connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      2E-8 (L) - A77-1 (B2) Always Below 1 Ω
      2E-8 (L) - A77-2 (B) Always Below 1 Ω
      Result
      Proceed to
      OK
      NG

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  11. CHECK SEMICONDUCTOR POWER INTEGRATION ECU


    1. Reconnect the 2E semiconductor pwr integration ECU connector.

    2. B0077PFC08
      *a

      Front view of wire harness connector

      (to Windshield Glass (Windshield Deicer Wire))

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

      Standard Voltage
      Tester Connection Condition Specified Condition
      A77-1 (B2) - Body ground Engine switch on (IG), Front wiper deicer switch off Below 1 V
      A77-1 (B2) - Body ground Engine switch on (IG), Front wiper deicer switch on 11 to 14 V
      A77-2 (B) - Body ground Engine switch on (IG), Front wiper deicer switch off Below 1 V
      A77-2 (B) - Body ground Engine switch on (IG), Front wiper deicer switch on 11 to 14 V
      Result
      Proceed to
      OK
      NG

    NG

    REPLACE SEMICONDUCTOR POWER INTEGRATION ECU Click here

    OK

  12. CHECK HARNESS AND CONNECTOR (WINDSHIELD GLASS (WINDSHIELD DEICER WIRE) - BODY GROUND)


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

      Standard Resistance
      Tester Connection Condition Specified Condition
      A77-3 (E) - Body ground Always Below 1 Ω
      Result
      Proceed to
      OK
      NG

    OK

    REPLACE WINDSHIELD GLASS (WINDSHIELD DEICER WIRE) Click here

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR