WIPER AND WASHER SYSTEM, Diagnostic DTC:B1372

DTC Code DTC Name
B1372 Wiper Switch Signal Mismatch between LIN and Line

DESCRIPTION

Under normal operation, the windshield wiper motor assembly receives operation signals from the windshield wiper switch assembly via LIN communication.

The windshield wiper motor assembly and windshield wiper switch assembly are also connected via direct line in order to operate the front wipers in HI in an emergency. If the operation signals sent via LIN communication and direct line do not match, this DTC is stored.

DTC No. Detection Item DTC Detection Condition Trouble Area Memory DTC Output from
B1372 Wiper Switch Signal Mismatch between LIN and Line

    Detection condition:

  • Battery voltage is 9.5 V or more


    Malfunction Status:

  • The operation signals sent via LIN communication and direct line do not match


    Malfunction Time:

  • 10 seconds or more

  • Windshield wiper motor assembly

  • Main body ECU (multiplex network body ECU)

  • Steering sensor

  • Harness or connector

 ○ Windshield wiper motor assembly

WIRING DIAGRAM


  1. for LHD

    B0084IOE04

  2. for RHD

    B0084IOE05

CAUTION / NOTICE / HINT

Note


  • 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. CLEAR DTC


    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 / Trouble Codes.

    5. Clear the DTCs.


      Body Electrical > Wiper > Clear DTCs
      Result
      Proceed to
      NEXT

    NEXT

  2. CHECK FOR DTC


    1. Connect the GTS to the DLC3.

    2. Turn the ignition switch to ON.

    3. Wait 10 seconds or more.

    4. Turn the GTS on.

    5. Enter the following menus: Body Electrical / Wiper / Trouble Codes.

    6. Check for DTCs.


      Body Electrical > Wiper > Trouble Codes
      Result
      Result Proceed to
      DTC B1372 is not output A
      DTC B1372 is output B

    A

    USE SIMULATION METHOD TO CHECK Click here

    B

  3. 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
      Wiper Switch HI (Line) Front wiper switch HI position signal (direct line) OFF or ON

      OFF: Front wiper switch not in HI position

      ON: Front wiper switch in HI position

      		 -

      Body Electrical > Wiper > Data List
      Tester Display
      Wiper Switch HI (Line)
      OK
      The GTS display is normal.
      Result
      Result
      OK
      NG

    NG

    CHECK HARNESS AND CONNECTOR (STEERING SENSOR - WINDSHIELD WIPER MOTOR ASSEMBLY) Click here

    OK

  4. 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: Chassis / Steering Angle Sensor / Data List.

    5. 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 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

      		 -

      Chassis > Steering Angle Sensor > Data List
      Tester Display
      Wiper Hi Switch
      OK
      The GTS display is normal.
      Result
      Result
      OK
      NG

    NG

    REPLACE STEERING SENSOR Click here

    OK

  5. CHECK HARNESS AND CONNECTOR (MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU) - WINDSHIELD WIPER MOTOR ASSEMBLY)


    1. Disconnect the K51 main body ECU (multiplex network body ECU) connector.

    2. Disconnect the A31 windshield wiper motor assembly connector.

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

      Standard Resistance
      for LHD
      Tester Connection Condition Specified Condition
      K51-3 (LIN3) - A31-2 (LIN) Always Below 1 Ω
      K51-3 (LIN3) or A31-2 (LIN) - Body ground Always 10 kΩ Higher
      for RHD
      Tester Connection Condition Specified Condition
      K51-3 (LIN3) - A31-3 (LIN) Always Below 1 Ω
      K51-3 (LIN3) or A31-3 (LIN) - Body ground Always 10 kΩ Higher
      Result
      Proceed to
      OK
      NG

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  6. CHECK MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU)

    B0085VPC01
    *a

    Component without harness connected

    (Main Body ECU (Multiplex Network Body ECU)

    1. Check for voltage and pulses according to the value(s) in the table below.

      Standard Voltage
      Tester Connection Condition Specified Condition
      K51-3 (LIN3) - Body ground Ignition switch off Below 1 V
      Ignition switch ON Pulse generation
      Result
      Proceed to
      OK
      NG

    OK

    REPLACE WINDSHIELD WIPER MOTOR ASSEMBLY Click here

    NG

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

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


    1. Disconnect the K71 steering sensor connector.

    2. Disconnect the A31 windshield wiper motor assembly connector.

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

      Standard Resistance
      for LHD
      Tester Connection Condition Specified Condition
      K71-2 (2S) - A31-3 (2S) Always Below 1 Ω
      K71-2 (2S) or A31-3 (2S) - Body ground Always 10 kΩ Higher
      for RHD
      Tester Connection Condition Specified Condition
      K71-2 (2S) - A31-2 (2S) Always Below 1 Ω
      K71-2 (2S) or A31-2 (2S) - Body ground Always 10 kΩ Higher
      Result
      Proceed to
      OK
      NG

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  8. INSPECT STEERING SENSOR

    B00858NC02
    *a

    Component without harness connected

    (Steering Sensor)

    		 - -

    1. Remove the steering sensor.

      Click here

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      K71-2 (2S) - z6-27 (+2) Always Below 1 Ω
      Result
      Proceed to
      OK
      NG

    OK

    REPLACE WINDSHIELD WIPER MOTOR ASSEMBLY Click here

    NG

    REPLACE STEERING SENSOR Click here