WIPER AND WASHER SYSTEM, Diagnostic DTC:B1245

DTC Code DTC Name
B1245 Lost Communication with Wiper ECU LIN

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
B1245 Lost Communication with Wiper ECU LIN

    Detection condition:

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


    Malfunction Status:

  • Communication malfunction with windshield wiper motor assembly


    Malfunction Duration:

  • 10 seconds or more

  • Windshield wiper motor assembly

  • Harness or connector

  • Windshield wiper relay assembly (WIPER NO. 1)

  • Main body ECU (multiplex network body ECU)

 ○ Main body ECU (multiplex network body ECU)

WIRING DIAGRAM

B006BYNE03

CAUTION / NOTICE / HINT

Note


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

  • 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 engine switch on (IG) and wait for at least 10 seconds.

    3. Check for DTCs.

      Click here


      Body Electrical > Main Body > Trouble Codes
      Result
      Result Proceed to
      DTC B1245 is not output. A
      DTC B1245 is output. B
      DTC B1245 and B1373 are output. C

    A

    USE SIMULATION METHOD TO CHECK Click here

    C

    GO TO DTC B1373 Click here

    B

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


    1. Disconnect the A43 windshield wiper motor assembly connector.

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

      Standard Voltage
      for LHD
      Tester Connection Switch Condition Specified Condition
      A43-6 (+B) - Body ground Approximately 60 seconds have elapsed after engine switch is turned off Below 1 V
      Engine switch on (IG) or within approximately 60 seconds of engine switch being turned off 11 to 14 V
      for RHD
      Tester Connection Switch Condition Specified Condition
      A43-7 (+B) - Body ground Approximately 60 seconds have elapsed after engine switch is turned off Below 1 V
      Engine switch on (IG) or within approximately 60 seconds of engine switch being turned off 11 to 14 V
      Result
      Proceed to
      OK
      NG

    NG

    INSPECT WINDSHIELD WIPER RELAY ASSEMBLY (WIPER NO. 1) Click here

    OK

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


    1. Disconnect the A43 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
      A43-4 (GND) - Body ground Always Below 1 Ω
      for RHD
      Tester Connection Condition Specified Condition
      A43-1 (GND) - Body ground Always Below 1 Ω
      Result
      Proceed to
      OK
      NG

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

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


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

    2. Disconnect the A43 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
      G13-3 (LIN3) - A43-7 (LIN) Always Below 1 Ω
      for RHD
      Tester Connection Condition Specified Condition
      G13-3 (LIN3) - A43-6 (LIN) Always Below 1 Ω
      Result
      Proceed to
      OK
      NG

    OK

    REPLACE WINDSHIELD WIPER MOTOR ASSEMBLY Click here

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

  5. INSPECT WINDSHIELD WIPER RELAY ASSEMBLY (WIPER NO. 1)


    1. Remove the windshield wiper relay assembly (WIPER NO. 1) from engine room relay block.

    2. Inspect the windshield wiper relay assembly (WIPER NO. 1).

      Click here

      Result
      Proceed to
      OK
      NG

    NG

    REPLACE WINDSHIELD WIPER RELAY ASSEMBLY (WIPER NO. 1)

    OK

  6. CHECK HARNESS AND CONNECTOR (WINDSHIELD WIPER RELAY ASSEMBLY [WIPER NO. 1] - BATTERY AND BODY GROUND)


    1. B006G9WC01
      *a

      Front view of wire harness connector

      (to Windshield Wiper Relay Assembly [WIPER NO. 1])

      Remove the windshield wiper relay assembly (WIPER NO. 1) form engine room relay block.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      Windshield wiper relay assembly (WIPER NO. 1) terminal 2 - Body ground Always Below 1 Ω

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

      Standard Voltage
      Tester Connection Condition Specified Condition
      Windshield wiper relay assembly (WIPER NO. 1) terminal 5 - Body ground Always 11 to 14 V
      Result
      Proceed to
      OK
      NG

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  7. CHECK HARNESS AND CONNECTOR (WINDSHIELD WIPER RELAY ASSEMBLY [WIPER NO. 1] - MAIN BODY ECU [MULTIPLEX NETWORK BODY ECU] AND WINDSHIELD WIPER MOTOR ASSEMBLY)


    1. Remove the windshield wiper relay assembly (WIPER NO. 1) form engine room relay block.

    2. Disconnect the G12 main body ECU (multiplex network body ECU) connector.

    3. Disconnect the A43 windshield wiper motor assembly connector.

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

      Standard Resistance
      for LHD
      Tester Connection Condition Specified Condition
      G12-21 (WPS) - Windshield wiper relay assembly (WIPER NO. 1) terminal 1 Always Below 1 Ω
      Windshield wiper relay assembly (WIPER NO. 1) terminal 3 - A43-6 (+B) Always Below 1 Ω
      G12-21 (WPS) or Windshield wiper relay assembly (WIPER NO. 1) terminal 1 - Body ground Always 10 kΩ or higher
      Windshield wiper relay assembly (WIPER NO. 1) terminal 3 or A43-6 (+B) - Body ground Always 10 kΩ or higher
      for RHD
      Tester Connection Condition Specified Condition
      G12-21 (WPS) - Windshield wiper relay assembly (WIPER NO. 1) terminal 1 Always Below 1 Ω
      Windshield wiper relay assembly (WIPER NO. 1) terminal 3 - A43-7 (+B) Always Below 1 Ω
      G12-21 (WPS) or Windshield wiper relay assembly (WIPER NO. 1) terminal 1 - Body ground Always 10 kΩ or higher
      Windshield wiper relay assembly (WIPER NO. 1) terminal 3 or A43-7 (+B) - 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