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Home >> Toyota >> 2021 >> Highlander LE, 4WD >> Repair and Diagnosis >> Accessories & Equipment >> Wiper/Washer Systems >> Wiper System / Washer System - Diagnostic Codes & Circuit Tests >> Wiper And Washer System >> Wiper and Washer Switch Circuit [12/2019 - ] >> Procedure

Wiper and Washer Switch Circuit [12/2019 - ]: Procedure

  1. READ VALUE USING GTS 
    1. Read the Data List according to the display on the GTS.

      Chassis > Steering Angle Sensor > Data List 

      Tester Display Measurement Item Range Normal Condition Diagnostic Note
      Wiper OFF Switch Front wiper switch OFF position signal OFF or ON OFF: Front wiper switch not in OFF position
      ON: Front wiper switch in OFF position      		 -
      Wiper Auto/Int Switch Front wiper switch AUTO*1 or INT*2 position signal OFF or ON OFF: Front wiper switch not in AUTO*1 or INT*2 position
      ON: Front wiper switch in AUTO*1 or INT*2 position      		 -
      Wiper Lo Switch Front wiper switch LO position signal OFF or ON OFF: Front wiper switch not in LO position
      ON: Front wiper switch in LO position      		 -
      Wiper Hi Switch Front wiper switch HI position signal OFF or ON OFF: Front wiper switch not in HI position
      ON: Front wiper switch in HI position      		 -
      Wiper Mist Switch Front wiper switch MIST position signal OFF or ON OFF: Front wiper switch not in MIST position
      ON: Front wiper switch in MIST position      		 -
      Washer Switch Washer switch Fr WASH position signal OFF or ON OFF: Washer switch not in Fr WASH position
      ON: Washer switch in Fr WASH position      		 -
      Rear Wiper Lo Switch Rear wiper switch Rr ON position signal OFF or ON OFF: Rear wiper switch not in Rr ON position
      ON: Rear wiper switch in Rr ON position      		 -
      Rear Wiper Hi Switch Rear wiper switch Rr INT position signal OFF or ON OFF: Rear wiper switch not in Rr INT position
      ON: Rear wiper switch in Rr INT position      		 -
      Rear Washer Switch Washer switch Rr WASH position signal OFF or ON OFF: Washer switch not in Rr WASH position
      ON: Washer switch in Rr WASH position      		 -
      Intermittent Time Volume Auto sensitivity adjustment switch condition*1
      Intermittent time adjustment switch condition*2      		 Shortest, Shorter, Longer or Longest Shortest: P4
      Shorter: P3
      Longer: P2
      Longest: P1      		 *3
      1. *1: w/ Auto Wiper System
      2. *2: w/o Auto Wiper System
      3. *3: Refer to Inspection for each position of the switch.

        Refer to INSPECTION [12/2019 - ]

      Chassis > Steering Angle Sensor > Data List 

      Tester Display
      Wiper OFF Switch
      Wiper Auto/Int Switch
      Wiper Lo Switch
      Wiper Hi Switch
      Wiper Mist Switch
      Washer Switch
      Rear Wiper Lo Switch
      Rear Wiper Hi Switch
      Rear Washer Switch
      Intermittent Time Volume

      OK

      The GTS display changes correctly in response to the windshield wiper switch assembly operation.

      Result

      Proceed to
      OK
      NG

    Result: 

    OK 

    PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE. Refer to  PROBLEM SYMPTOMS TABLE [12/2019 - ] 

    Result: 

    NG 

    See step  2

  2. INSPECT WINDSHIELD WIPER SWITCH ASSEMBLY 
    1. Remove the windshield wiper switch assembly.

      Refer to REMOVAL [12/2019 - ]

    2. Inspect the windshield wiper switch assembly.

      Refer to INSPECTION [12/2019 - ]

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    REPLACE WINDSHIELD WIPER SWITCH ASSEMBLY. Refer to  REMOVAL [12/2019 - ] 

    Result: 

    OK 

    See step  3

  3. INSPECT STEERING WHEEL SWITCH HOUSING 
    1. Remove the steering wheel switch housing.

      Refer to REMOVAL [12/2019 - 10/2022] , or refer to REMOVAL [10/2022 - 11/2023] , or refer to REMOVAL [11/2023 - ]

    2. Inspect the steering wheel switch housing.

      Refer to INSPECTION [12/2019 - ]

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    REPLACE STEERING WHEEL SWITCH HOUSING. Refer to  REMOVAL [12/2019 - 10/2022]  , or refer to  REMOVAL [10/2022 - 11/2023]  , or refer to  REMOVAL [11/2023 - ] 

    Result: 

    OK 

    See step  4

  4. CHECK HARNESS AND CONNECTOR (STEERING SENSOR - WINDSHIELD WIPER RELAY ASSEMBLY) 
    1. Disconnect the A7 windshield wiper relay assembly connector.
    2. Disconnect the H57 steering sensor connector.
    3. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      H57-2 (2S) - A7-3 (2S) Always Below 1 Ω
      H57-2 (2S) or A7-3 (2S) - Body ground Always 10 kΩ or higher

      Result

      Proceed to
      OK
      NG

    Result: 

    OK 

    REPLACE WINDSHIELD WIPER RELAY ASSEMBLY. Refer to  REMOVAL [12/2019 - 10/2022]  , or refer to  REMOVAL [10/2022 - 11/2023]  , or refer to  REMOVAL [11/2023 - ] 

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

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