WINDOW DEFOGGER SYSTEM Rear Window Defogger System does not Operate

DESCRIPTION

When the rear window defogger switch on the air conditioning control assembly is pressed, the operation signal is transmitted to the air conditioning amplifier assembly via LIN communication. When the air conditioning amplifier assembly receives the signal, it turns on the semiconductor pwr integration ECU to operate the window defogger system.

WIRING DIAGRAM

A0021TLE06

CAUTION / NOTICE / HINT

Note


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

  • If the auxiliary battery voltage is low, the window defogger 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. CHECK AIR CONDITIONING SYSTEM


    1. Check the air conditioning system.

      Tech Tips

      Both the window defogger system operation signal and air conditioning system operation signal are transmitted to the air conditioning amplifier assembly through 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. PERFORM ACTIVE TEST USING GTS


    1. Connect the GTS to the DLC3.

    2. Turn the power 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
      Defogger Relay (Rear) Back window glass (rear window defogger wire) OFF or ON -

      Body Electrical > Air Conditioner > Active Test
      Tester Display
      Defogger Relay (Rear)
      OK
      The rear window defogger system operates normally.
      Result
      Proceed to
      OK
      NG

    NG

    CHECK SEMICONDUCTOR PWR INTEGRATION ECU Click here

    OK

  3. REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY


    1. Replace the air conditioning amplifier assembly with a new or known good one.

      Click here

    2. Check that the window defogger system operates normally.

      Click here

      OK
      The window defogger system operates normally.
      Result
      Proceed to
      OK
      NG

    OK

    END (AIR CONDITIONING AMPLIFIER ASSEMBLY WAS DEFECTIVE)

    NG

    REPLACE AIR CONDITIONING CONTROL ASSEMBLY Click here

  4. CHECK SEMICONDUCTOR PWR 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 PWR INTEGRATION ECU (RESULTS OF SIGNAL READING CHECK) Click here

    OK

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


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

      Click here

      A0021IUC04
      *a

      Component without semiconductor pwr integration ECU

      (No. 1 Engine Room Relay Block and No. 1 Junction Block Assembly)

      		 - -

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

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

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

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

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

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


    1. Disconnect the K10 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
      K10-25 (RDEF) - 1D-5 (-S) Always Below 1 Ω
      K10-25 (RDEF) - Body ground Always 10 kΩ or higher
      1D-5 (-S) - Body ground Always 10 kΩ or higher
      Result
      Proceed to
      OK
      NG

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  7. CHECK SEMICONDUCTOR PWR INTEGRATION ECU


    1. Install the semiconductor pwr integration ECU.

      Click here

    2. A0022MGC05
      *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
      K10-25 (RDEF) - Body ground Power switch on (IG), rear window defogger switch off 11 to 14 V
      Result
      Proceed to
      OK
      NG

    NG

    REPLACE SEMICONDUCTOR PWR INTEGRATION ECU Click here

    OK

  8. CHECK AIR CONDITIONING AMPLIFIER ASSEMBLY


    1. Reconnect the K10 air conditioning amplifier assembly connector.

    2. B003XPUC14
      *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
      K10-25 (RDEF) - K10-1 (GND) Power switch on (IG), rear window defogger switch on Below 2.2 V
      K10-25 (RDEF) - K10-1 (GND) Power switch on (IG), rear window defogger switch off 11 to 14 V
      Result
      Proceed to
      OK
      NG

    NG

    REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY Click here

    OK

  9. CHECK HARNESS AND CONNECTOR (SEMICONDUCTOR PWR INTEGRATION ECU - BACK WINDOW GLASS (REAR WINDOW DEFOGGER WIRE))


    1. Disconnect the Q54 back window glass (rear window defogger wire) connector.

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

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      1C-1(L) - Q54-1 Always Below 1 Ω
      Result
      Proceed to
      OK
      NG

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  10. CHECK SEMICONDUCTOR PWR INTEGRATION ECU


    1. Reconnect the 1C semiconductor pwr integration ECU connector.

    2. A0022S0C03
      *a

      Front view of wire harness connector

      (to Back Window Glass (Rear Window Defogger Wire))

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

      Standard Voltage
      Tester Connection Condition Specified Condition
      Q54-1 - Body ground Power switch on (IG), rear window defogger switch on 11 to 14 V
      Q54-1 - Body ground Power switch on (IG), rear window defogger switch off Below 1 V
      Result
      Proceed to
      OK
      NG

    NG

    REPLACE SEMICONDUCTOR PWR INTEGRATION ECU Click here

    OK

  11. CHECK HARNESS AND CONNECTOR (BACK WINDOW GLASS (REAR WINDOW DEFOGGER WIRE) - BODY GROUND)


    1. Disconnect the P30 back window glass (rear window defogger wire) connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      P30-1 - Body ground Always Below 1 Ω
      Result
      Proceed to
      OK
      NG

    OK

    REPAIR OR REPLACE BACK WINDOW GLASS (REAR WINDOW DEFOGGER WIRE) Click here

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR