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 and link 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 When the battery voltage is 9.5 V or more, 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 for 7 seconds or more 3 times consecutively.

  • Front wiper motor and link assembly

  • Windshield wiper switch assembly

  • Rain sensor

  • Harness or connector

  • Main body ECU (multiplex network body ECU)

 ○ Main body ECU (multiplex network body ECU)

WIRING DIAGRAM


  1. for Wiper Switch RH Side Type:

    A01VUHXE04

  2. for Wiper Switch LH Side Type:

    A01VUHXE06

CAUTION / NOTICE / HINT

Note

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

PROCEDURE


  1. CHECK HARNESS AND CONNECTOR (MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU) - FRONT WIPER MOTOR AND LINK ASSEMBLY)


    1. Disconnect the J9 main body ECU (multiplex network body ECU) connector.

    2. Disconnect the i1 front wiper motor and link assembly connector.

    3. Disconnect the J31 windshield wiper switch assembly connector.

    4. Disconnect the U3 rain sensor connector (w/ Auto Wiper System).

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

      Standard Resistance
      for Wiper Switch RH Side Type
      Tester Connection Condition Specified Condition
      J9-8 (LIN3) - i1-2 (MPX1) Always Below 1 Ω
      J9-8 (LIN3) - J31-7 (MPX1) Always Below 1 Ω

      J9-8 (LIN3) - U3-3 (MPX)

      *

      		 Always Below 1 Ω
      J9-8 (LIN3) or i1-2 (MPX1) or J31-7 (MPX1) - Body ground Always 10 kΩ or higher

      J9-8 (LIN3) or i1-2 (MPX1) or J31-7 (MPX1) or U3-3 (MPX) - Body ground

      *

      		 Always 10 kΩ or higher
      for Wiper Switch RH Side Type
      Tester Connection Condition Specified Condition
      J9-8 (LIN3) - i1-2 (MPX1) Always Below 1 Ω
      J9-8 (LIN3) - J31-8 (MPX1) Always Below 1 Ω

      J9-8 (LIN3) - U3-3 (MPX)

      *

      		 Always Below 1 Ω
      J9-8 (LIN3) or i1-2 (MPX1) or J31-8 (MPX1) - Body ground Always 10 kΩ or higher

      J9-8 (LIN3) or i1-2 (MPX1) or J31-7 (MPX1) or U3-3 (MPX) - Body ground

      *

      		 Always 10 kΩ or higher

      • *: w/ Auto Wiper System

      Result
      Proceed to
      OK
      NG

    NG

    CHECK WIPER MOTOR WIRE Click here

    OK

  2. CHECK FRONT WIPER MOTOR AND LINK ASSEMBLY


    1. Reconnect the J9 main body ECU (multiplex network body ECU) connector.

    2. Reconnect the J31 windshield wiper switch assembly connector.

    3. Reconnect the U3 rain sensor connector (w/ Auto Wiper System).

    4. Turn the engine switch on (IG).

    5. Check for DTCs.

      Click here


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

    A

    REPLACE FRONT WIPER MOTOR AND LINK ASSEMBLY Click here

    B

  3. CHECK WINDSHIELD WIPER SWITCH ASSEMBLY


    1. Disconnect the J31 windshield wiper switch assembly connector.

    2. Reconnect the i1 front wiper motor and link assembly connector.

    3. Turn the engine switch on (IG).

    4. Check for DTCs.

      Click here


      Body Electrical > Main Body > Trouble Codes
      Result
      Result Proceed to
      DTC B1373 is not output. A
      DTC B1373 is output (w/o Auto Wiper System). B
      DTC B1373 is output (w/ Auto Wiper System). C

    A

    REPLACE WINDSHIELD WIPER SWITCH ASSEMBLY Click here

    B

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

    C

  4. CHECK RAIN SENSOR


    1. Disconnect the J31 windshield wiper switch assembly connector.

    2. Reconnect the U3 rain sensor connector.

    3. Turn the engine switch on (IG).

    4. Check for DTCs.

      Click here


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

    A

    REPLACE RAIN SENSOR Click here

    B

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

  5. CHECK WIPER MOTOR WIRE


    1. Remove the wiper motor wire.

      Click here

    2. B005NKXC28
      *a

      Front view of wire harness connector

      (to Front Wiper Motor and Link Assembly)
      *b

      Front view of wire harness connector

      (to Wire Harness)

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      i1-2 (MPX1) - iA1-1 Always Below 1 Ω
      Result
      Proceed to
      OK
      NG

    OK

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    NG

    REPLACE WIPER MOTOR WIRE Click here