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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 >> Rear Wiper Motor Circuit [11/2023 - ] >> Procedure

Rear Wiper Motor Circuit [11/2023 - ]: Procedure

  1. PERFORM ACTIVE TEST USING GTS 
    1. Perform the Active Test according to the display on the GTS.

      Body Electrical > Main Body > Active Test 

      Tester Display Measurement Item Control Range Diagnostic Note
      Rear Wiper Operation Function to operate the rear wiper motor assembly OFF or ON -

      Body Electrical > Main Body > Active Test 

      Tester Display
      Rear Wiper Operation

      OK

      Rear wiper motor assembly operates normally.

      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 REAR WIPER MOTOR ASSEMBLY 
    1. Remove the rear wiper motor assembly.

      Refer to REMOVAL [12/2019 - ]

    2. Inspect the rear wiper motor assembly.

      Refer to INSPECTION [12/2019 - ]

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    REPLACE REAR WIPER MOTOR ASSEMBLY. Refer to  REMOVAL [12/2019 - ] 

    Result: 

    OK 

    See step  3

  3. CHECK HARNESS AND CONNECTOR (POWER SOURCE - REAR WIPER MOTOR ASSEMBLY) 
    1. Measure the voltage according to the value(s) in the table below.

      Standard Voltage

      Tester Connection Condition Specified Condition
      W4-4 (+B) - Body ground Ignition switch ON 11 to 14 V

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

    Result: 

    OK 

    See step  4

  4. CHECK HARNESS AND CONNECTOR (REAR WIPER MOTOR ASSEMBLY - BODY GROUND) 
    1. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      W4-5 (E) - Body Ground Always Below 1 Ω

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

    Result: 

    OK 

    See step  5

  5. CHECK HARNESS AND CONNECTOR (REAR WIPER MOTOR ASSEMBLY - MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU)) 
    1. Disconnect the H135 main body ECU (multiplex network body ECU) connector.
    2. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      W4-3 (LS) - H135-11 (RWRY) Always Below 1 Ω
      W4-3 (LS) or H135-11 (RWRY) - Body ground Always 10 kΩ or higher

      Result

      Proceed to
      OK
      NG

    Result: 

    OK 

    REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU). Refer to  REMOVAL [11/2023 - ] 

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR