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WIPER AND WASHER SYSTEM, Diagnostic DTC:B1245

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DTC Code DTC Name
B1245 Lost Communication with Wiper ECU LIN
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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:

  • Power 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)
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WIRING DIAGRAM

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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.

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PROCEDURE


  1. Click here

    CHECK FOR DTC


    1. Clear the DTCs.

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      1. Body Electrical > Main Body > Clear DTCs


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

    3. Check for DTCs.

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      1. 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

  2. Click here

    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
      Table 1. for LHD
      Tester Connection Switch Condition Specified Condition
      A43-6 (+B) - Body ground Approximately 60 seconds have elapsed after power switch is turned off Below 1 V
      Power switch on (IG) or within approximately 60 seconds of power switch being turned off 11 to 14 V
      Table 2. for RHD
      Tester Connection Switch Condition Specified Condition
      A43-7 (+B) - Body ground Approximately 60 seconds have elapsed after power switch is turned off Below 1 V
      Power switch on (IG) or within approximately 60 seconds of power switch being turned off 11 to 14 V
      Result
      Proceed to
      OK
      NG

  3. Click here

    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
      Table 3. for LHD
      Tester Connection Condition Specified Condition
      A43-4 (GND) - Body ground Always Below 1 Ω
      Table 4. for RHD
      Tester Connection Condition Specified Condition
      A43-1 (GND) - Body ground Always Below 1 Ω
      Result
      Proceed to
      OK
      NG

    • OKClick here
    • NG

      REPAIR OR REPLACE HARNESS OR CONNECTOR

  4. Click here

    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
      Table 5. for LHD
      Tester Connection Condition Specified Condition
      G13-3 (LIN3) - A43-7 (LIN) Always Below 1 Ω
      Table 6. 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 ASSEMBLYClick here

    • NG

      REPAIR OR REPLACE HARNESS OR CONNECTOR

  5. Click here

    INSPECT WINDSHIELD WIPER RELAY ASSEMBLY (WIPER NO. 1)


    1. Remove the windshield wiper relay assembly (WIPER NO. 1) from No. 2 engine room relay block.

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

      Click here

      Result
      Proceed to
      OK
      NG

    • OKClick here
    • NG

      REPLACE WINDSHIELD WIPER RELAY ASSEMBLY (WIPER NO. 1)

  6. Click here

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


    1. B004X7FC01
      *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 No. 2 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 Switch Condition Specified Condition
      Windshield wiper relay assembly (WIPER NO. 1) terminal 5 - Body ground Power switch off 11 to 14 V
      Result
      Proceed to
      OK
      NG

    • OKClick here
    • NG

      REPAIR OR REPLACE HARNESS OR CONNECTOR

  7. Click here

    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 No.2 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
      Table 7. 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
      Table 8. 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