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) communicates with the windshield wiper motor assembly, windshield wiper switch assembly and rain sensor via LIN communication. If a malfunction occurs in the LIN communication line and a communication error occurs, this DTC is stored.

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

    DTC Detection Condition:

  • Power switch on (IG) (IG+ voltage 9.5 V or higher)


    Malfunction Status:

  • Wire-type LIN communication error detected


    Malfunction Duration:

  • 7 seconds or more

  • Windshield wiper motor assembly

  • Rain sensor

  • Harness or connector

  • Main body ECU (multiplex network body ECU)

 ○ Main body ECU (multiplex network body ECU)

WIRING DIAGRAM

B004V3AE02

CAUTION / NOTICE / HINT

Note

If the main body ECU (multiplex network body ECU) is replaced, refer to Service Bulletin.

PROCEDURE


  1. CHECK FOR DTC


    1. Clear the DTCs.

      Click here


      Body Electrical > Main Body > Clear DTCs

    2. Turn the power switch on (IG) and wait for at least 10 seconds.

    3. Check for DTCs.

      Click here


      Body Electrical > Main Body > Trouble Codes
      OK
      DTC B1373 is not output
      Result
      Proceed to
      OK
      NG

    OK

    USE SIMULATION METHOD TO CHECK Click here

    NG

  2. CHECK RAIN SENSOR


    1. Disconnect the N29 rain sensor connector.

    2. Clear the DTCs.

      Click here


      Body Electrical > Main Body > Clear DTCs

    3. Turn the power switch on (IG) and wait for at least 10 seconds.

    4. Check for DTCs.

      Click here


      Body Electrical > Main Body > Trouble Codes
      Result
      Result Proceed to
      DTC B1373 is not output, but DTC B1279 is output A
      DTC B1373 is output B

    A

    REPLACE RAIN SENSOR Click here

    B

  3. CHECK WINDSHIELD WIPER MOTOR ASSEMBLY


    1. Disconnect the A43 windshield wiper motor assembly connector.

    2. Clear the DTCs.

      Click here


      Body Electrical > Main Body > Clear DTCs

    3. Turn the power switch on (IG) and wait for at least 10 seconds.

    4. Check for DTCs.

      Click here


      Body Electrical > Main Body > Trouble Codes
      Result
      Result Proceed to
      DTC B1373 is not output, but DTC B1245 is output A
      DTC B1373 is output B

    A

    REPLACE WINDSHIELD WIPER MOTOR ASSEMBLY Click here

    B

  4. CHECK HARNESS AND CONNECTOR (MAIN BODY ECU [MULTIPLEX NETWORK BODY ECU] - RAIN SENSOR)


    1. Disconnect the G13 main body ECU (multiplex network body ECU) connector.

    2. Disconnect the N29 rain sensor connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      G13-3 (LIN3) - N29-3 (MPX) Always Below 1 Ω
      Result
      Proceed to
      OK
      NG

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

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


    1. Disconnect the G13 main body ECU (multiplex network body ECU) connector.

    2. Disconnect the A43 windshield wiper motor assembly connector.

    3. Disconnect the N29 rain sensor connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      G13-3 (LIN3) - 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