WIPER AND WASHER SYSTEM Wiper Motor Power Source Circuit

DESCRIPTION

This circuit is the power source circuit for the windshield wiper motor assembly.

WIRING DIAGRAM

B00875BE05

CAUTION / NOTICE / HINT

Note


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

  • The vehicle battery supplies power to the main body ECU (multiplex network body ECU) via the door control battery. Therefore, before performing this troubleshooting procedure, make sure to perform an on-vehicle inspection to confirm that the main body ECU (multiplex network body ECU) power source circuit is normal.*1

    Click here

  • Before replacing the main body ECU (multiplex network body ECU), refer to Service Bulletin.*2


    • *1: w/ Door Control Battery

    • *2: w/ Smart Entry and Start System

PROCEDURE


  1. READ VALUE USING GTS


    1. Connect the GTS to the DLC3.

    2. Turn the ignition switch to ON.

    3. Turn the GTS on.

    4. Enter the following menus: Body Electrical / Wiper / Data List.

    5. Read the Data List according to the display on the GTS.


      Body Electrical > Wiper > Data List
      Tester Display Measurement Item Range Normal Condition Diagnostic Note
      Motor Power Supply Voltage Front wiper motor assembly supply voltage status

      Min.: 0 V

      Max.: 63 V

      		 Almost the same as actual front wiper motor assembly voltage -

      Body Electrical > Wiper > Data List
      Tester Display
      Motor Power Supply Voltage
      OK
      The GTS display is normal.
      Result
      Proceed to
      OK
      NG

    OK

    PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE Click here

    NG

  2. CHECK HARNESS AND CONNECTOR (WINDSHIELD WIPER MOTOR ASSEMBLY - BODY GROUND)


    1. Disconnect the A31 windshield wiper motor assembly connector.

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

      Standard Resistance
      for LHD
      Tester Connection Condition Specified Condition
      A31-1 (GND) - Body ground Always Below 1 Ω
      for RHD
      Tester Connection Condition Specified Condition
      A31-4 (GND) - Body ground Always Below 1 Ω
      Result
      Proceed to
      OK
      NG

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  3. CHECK HARNESS AND CONNECTOR (POWER SOURCE - WINDSHIELD WIPER MOTOR ASSEMBLY)


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

      Standard Voltage
      for LHD
      Tester Connection Condition Specified Condition
      A31-4 (+B) - Body ground Ignition switch ON 11 to 14 V
      Less than approximately 60 seconds after ignition switch turned off 11 to 14 V
      Approximately 60 seconds after ignition switch turned off Below 1 V
      for RHD
      Tester Connection Condition Specified Condition
      A31-1 (+B) - Body ground Ignition switch ON 11 to 14 V
      Less than approximately 60 seconds after ignition switch turned off 11 to 14 V
      Approximately 60 seconds after ignition switch turned off Below 1 V
      Result
      Proceed to
      OK
      NG

    OK

    REPLACE WINDSHIELD WIPER MOTOR ASSEMBLY Click here

    NG

  4. INSPECT WIPER RELAY


    1. Inspect the WIPER relay.

      Click here

      Result
      Proceed to
      OK
      NG

    NG

    REPLACE WIPER RELAY

    OK

  5. CHECK HARNESS AND CONNECTOR (POWER SOURCE - WIPER RELAY)


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

      Standard Voltage
      Tester Connection Condition Specified Condition
      3 (WIPER relay) - Body ground Always 11 to 14 V
      Result
      Proceed to
      OK
      NG

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  6. CHECK HARNESS AND CONNECTOR (WIPER RELAY - BODY GROUND)


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

      Standard Resistance
      Tester Connection Condition Specified Condition
      2 (WIPER relay) - Body ground Always Below 1 Ω
      Result
      Proceed to
      OK
      NG

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  7. CHECK HARNESS AND CONNECTOR (WIPER RELAY - WINDSHIELD WIPER MOTOR ASSEMBLY)


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

      Standard Resistance
      for LHD
      Tester Connection Condition Specified Condition
      5 (WIPER relay) - A31-4 (+B) Always 10 kΩ or higher
      5 (WIPER relay) or A31-4 (+B) - Body ground Always Below 1 Ω
      for RHD
      Tester Connection Condition Specified Condition
      5 (WIPER relay) - A31-1 (+B) Always 10 kΩ or higher
      5 (WIPER relay) or A31-1 (+B) - Body ground Always Below 1 Ω
      Result
      Proceed to
      OK
      NG

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  8. CHECK HARNESS AND CONNECTOR (WIPER RELAY - MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU))


    1. Disconnect the K52 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
      1 (WIPER relay) - K52-21 (WPS) Always Below 1 Ω
      1 (WIPER relay) or K52-21 (WPS) - Body ground Always 10 kΩ or higher
      Result
      Proceed to
      OK
      NG

    OK

    REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU) Click here

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR