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Home >> Lexus >> 2021 >> ES 350 Luxury >> Repair and Diagnosis (Single Page) >> Accessories & Equipment >> Heated Glass/Defoggers >> Windshield Deicer System (Except Hybrid) - Diagnostics & Symptom Tests >> WINDSHIELD DEICER SYSTEM (for Gasoline Model) >> Windshield Deicer does not Operate [06/2018 - ] >> Procedure

Windshield Deicer does not Operate [06/2018 - ]: Procedure

  1. CHECK AIR CONDITIONING SYSTEM 
    1. Check that the air conditioning system can be operated using the remote touch.

      HINT: 

      Both the windshield deicer system operation signal and air-conditioning system operation signal are transmitted to the air-conditioning amplifier assembly through same communication line.

      OK

      The air conditioning system operates normally.

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    GO TO AIR CONDITIONING SYSTEM. Refer to  HOW TO PROCEED WITH TROUBLESHOOTING [06/2018 - 08/2020]  , or refer to  HOW TO PROCEED WITH TROUBLESHOOTING [08/2020 - ] 

    Result: 

    OK 

    See step  2

  2. PERFORM ACTIVE TEST USING TECHSTREAM 
    1. Connect the Techstream to the DLC3.
    2. Turn the engine switch on (IG).
    3. Turn the Techstream on.
    4. Enter the following menus: Body Electrical / Air Conditioner / Active Test.
    5. Perform the Active Test according to the display on the Techstream.

      Body Electrical > Air Conditioner > Active Test 

      Tester Display Measurement Item Control Range Diagnostic Note
      Deicer Relay (Front) Windshield deicer wire (windshield glass) 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

    Result: 

    NG 

    See step  5

    Result: 

    OK 

    See step  3

  3. REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY 
    1. Replace the air conditioning amplifier assembly with a new or known good one.

      Refer to REMOVAL [06/2018 - 08/2020] , or refer to REMOVAL [08/2020 - ]

    2. Check that the windshield deicer system operates normally.

      OK

      The windshield deicer system operates normally.

      Result

      Proceed to
      OK
      NG

    Result: 

    OK 

    END (AIR CONDITIONING AMPLIFIER ASSEMBLY WAS DEFECTIVE) 

    Result: 

    NG 

    See step  4

  4. REPLACE RADIO RECEIVER ASSEMBLY 
    1. Replace the radio receiver assembly with a new or known good one.

      Refer to REMOVAL [06/2018 - 08/2020] , or refer to REMOVAL [08/2020 - 09/2022] , or refer to REMOVAL [09/2022 - ]

    2. Check that the windshield deicer system operates normally.

      OK

      The windshield deicer system operates normally.

      Result

      Proceed to
      OK
      NG

    Result: 

    OK 

    END (RADIO RECEIVER ASSEMBLY WAS DEFECTIVE) 

    Result: 

    NG 

    REPLACE MULTI-DISPLAY ASSEMBLY. Refer to  REMOVAL [06/2018 - 08/2021]  , or refer to  REMOVAL [08/2021 - ] 

  5. INSPECT DEICER RELAY 
    1. Inspect the DEICER relay.

      Refer to ON-VEHICLE INSPECTION [06/2018 - ]

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

    Result: 

    OK 

    See step  6

  6. CHECK WIRE HARNESS AND CONNECTOR (DEICER RELAY - IG POWER SUPPLY) 
    1. Measure the voltage according to the value(s) in the table below.
      GTY824628Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a DEICER Relay Holder

      Standard Voltage

      Tester Connection Condition Specified Condition
      DEICER relay holder terminal 1 - Body ground Engine switch on (IG) 11 to 14 V
      DEICER relay holder terminal 5 - Body ground Always 11 to 14 V

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

    Result: 

    OK 

    See step  7

  7. CHECK WIRE HARNESS AND CONNECTOR (DEICER RELAY - AIR CONDITIONING AMPLIFIER ASSEMBLY) 
    1. Disconnect G39 air conditioning amplifier assembly connector.
      GTY824628Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a DEICER Relay Holder
    2. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      DEICER relay holder terminal 2 - G39-17 (FDEF) Always Below 1 Ω
      DEICER relay holder terminal 2 - Body ground Always 10 kΩ higher

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

    Result: 

    OK 

    See step  8

  8. CHECK AIR CONDITIONING AMPLIFIER ASSEMBLY 
    1. Reconnect the G39 air conditioning amplifier assembly connector.
    2. Measure the voltage according to the value(s) in the table below.
      GTY779786Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Component with harness connected
      (Air Conditioning Amplifier Assembly)

      Standard Voltage

      Tester Connection Condition Specified Condition
      G39-17 (FDEF) - G39-4 (GND) Engine switch on (IG), Front wiper deicer switch on Below 1 V
      G39-17 (FDEF) - G39-4 (GND) Engine switch on (IG), Front wiper deicer switch off 11 to 14 V

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY 

    Result: 

    OK 

    See step  9

  9. CHECK WIRE HARNESS AND CONNECTOR (DEICER RELAY - WINDSHIELD DEICER WIRE (WINDSHIELD GLASS)) 
    1. Disconnect A59 windshield deicer wire (windshield glass) connector.
      GTY824630Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a DEICER Relay Holder
    2. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      DEICER relay holder terminal 3 - A59-1 (B) Always Below 1 Ω
      DEICER relay holder terminal 3 - Body ground Always 10 kΩ higher

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

    Result: 

    OK 

    See step  10

  10. CHECK WIRE HARNESS AND CONNECTOR (WINDSHIELD DEICER WIRE (WINDSHIELD GLASS) - BODY GROUND) 
    1. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      A59-2 (E) - Body ground Always Below 1 Ω

      Result

      Proceed to
      OK
      NG

    Result: 

    OK 

    REPLACE WINDSHIELD DEICER WIRE (WINDSHIELD GLASS). Refer to  REMOVAL [06/2018 - 08/2021]  , or refer to  REMOVAL [08/2021 - 09/2022]  , or refer to  REMOVAL [09/2022 - ] 

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

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