WIPER AND WASHER SYSTEM, Diagnostic DTC:B1373

DTC Code DTC Name
B1373 Lost Communication with Wiper System LIN BUS

DESCRIPTION

The main body ECU (multiplex network body ECU) and windshield wiper motor assembly communicate via LIN communication. The main body ECU (multiplex network body ECU) stores this DTC if communication becomes abnormal.

DTC No. Detection Item DTC Detection Condition Trouble Area Memory DTC Output from
B1373 Lost Communication with Wiper System LIN BUS

    Detection condition:

  • Battery voltage is 9.5 V or more


    Malfunction Status:

  • A malfunction in the communication or LIN communication line between the main body ECU (multiplex network body ECU) and components of the wiper system occurs


    Malfunction Time:

  • 7 seconds or more 3 times consecutively

  • Windshield wiper motor assembly

  • Main body ECU (multiplex network body ECU)

  • Harness or connector

  • Rain sensor*

 ○ Main body ECU (multiplex network body ECU)

WIRING DIAGRAM

B006XREE03

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. CONFIRM MODEL


    1. Choose the model to be inspected.

      Result
      Result Proceed to
      w/o Auto Wiper System A
      w/ Auto Wiper System B

    B

    CHECK RAIN SENSOR Click here

    A

  2. 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
      Tester Connection Condition Specified Condition
      K51-3 (LIN3) or A31-2 (LIN) - Body ground*1 Always 10 kΩ Higher
      K51-3 (LIN3) or A31-3 (LIN) - Body ground*2 Always 10 kΩ Higher

      • *1: for LHD

      • *2: for RHD

      Result
      Proceed to
      OK
      NG

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

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

    B0070MNC08
    *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

  4. CHECK RAIN SENSOR


    1. Disconnect the V4*1 or V5*2 rain sensor connector.


      • *1: for LHD

      • *2: for RHD

    2. Clear the DTCs.


      Body Electrical > Main Body > Clear DTCs

    3. Turn the ignition switch to ON and wait for at least 10 seconds.

    4. Check for DTCs.


      Body Electrical > Main Body > Trouble Codes
      Result
      Result Proceed to
      Only DTC B1279 is output A
      DTC B1373 is output B

    A

    REPLACE RAIN SENSOR Click here

    B

  5. CHECK WINDSHIELD WIPER MOTOR ASSEMBLY


    1. Disconnect the A31 windshield wiper motor assembly connector.

    2. Clear the DTCs.


      Body Electrical > Main Body > Clear DTCs

    3. Turn the ignition switch to ON and wait for at least 10 seconds.

    4. Check for DTCs.


      Body Electrical > Main Body > Trouble Codes
      Result
      Result Proceed to
      Only DTC B1245 is output A
      DTC B1373 is output B

    A

    REPLACE WINDSHIELD WIPER MOTOR ASSEMBLY Click here

    B

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


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

    2. Clear the DTCs.


      Body Electrical > Main Body > Clear DTCs

    3. Turn the ignition switch to ON and wait for at least 10 seconds.

    4. Check for DTCs.


      Body Electrical > Main Body > Trouble Codes
      Result
      Result Proceed to
      DTC B1373 is not output A
      DTC B1373 is output B

    A

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    B

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