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Home >> Lexus >> 2011 >> LX 570 >> Repair and Diagnosis (Single Page) >> Accessories & Equipment >> Wiper/Washer Systems >> Wiper System / Washer System (Diagnostics & Circuit Tests) >> Wiper And Washer System >> Circuit Tests >> Wiper and Washer Switch Circuit >> Procedure

Wiper and Washer Switch Circuit: Procedure

  1. INSPECT FUSE (ECU-IG No. 1) 
    1. Remove the ECU-IG No. 1 fuse from the cowl side junction block LH.
    2. Measure the resistance according to the value in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      ECU-IG No. 1 fuse Always Below 1 Ω

    NG → REPLACE FUSE 

    OK: Go to next step 

  2. READ VALUE USING TECHSTREAM (WINDSHIELD WIPER SWITCH) 
    1. Using the Techstream, read the Data List.
      BODY NO. 5

      Tester Display Measurement Item/Range Normal Condition Diagnostic Note
      Wiper Lo Switch Front wiper LO switch / ON or OFF ON: Front wiper switch in LO
      OFF: Front wiper switch not in LO      		 -
      Wiper Hi Switch Front wiper HI switch / ON or OFF ON: Front wiper switch in HI
      OFF: Front wiper switch not in HI      		 -
      Wiper Auto Switch Front wiper AUTO switch / ON or OFF ON: Front wiper switch in AUTO
      OFF: Front wiper switch not in AUTO      		 -
      Wiper Mist Switch Front wiper MIST switch / ON or OFF ON: Front wiper switch in MIST
      OFF: Front wiper switch not in MIST      		 -
      Washer Switch Front washer switch / ON or OFF ON: Front washer switch on
      OFF: Front washer switch off      		 -
      BODY NO. 4

      Tester Display Measurement Item/Range Normal Condition Diagnostic Note
      Rear Wiper Lo Switch Rear wiper LO switch / ON or OFF ON: Rear wiper switch in LO
      OFF: Rear wiper switch not in LO      		 -
      Rear Wiper Int Switch Rear wiper INT switch / ON or OFF ON: Rear wiper switch in INT
      OFF: Rear wiper switch not in INT      		 -
      Rear Washer Switch Rear washer switch / ON or OFF ON: Rear washer switch on
      OFF: Rear washer switch off      		 -

      OK

      The display is as specified in the normal condition.

    NG → See step   3 

    OK → See step   4 

  3. CHECK HARNESS AND CONNECTOR (WINDSHIELD WIPER SWITCH - BATTERY AND BODY GROUND) 
    1. Disconnect the E16 switch connector.
      Fig 1: Identifying E16 And E89 Connectors Terminals
      GTY153519Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Disconnect the E89 ECU connector.
    3. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      E16-2 (+B) - E89-6 (ES) Always Below 1 Ω
      E16-10 (E) - Body ground
      E16-2 (+B) - Body ground 10 kΩ or higher

    NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

    OK → See step   5 

  4. PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE. Refer to  PROBLEM SYMPTOMS TABLE  
  5. REPLACE WINDSHIELD WIPER SWITCH. Refer to  WIPER SWITCH 
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