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

    DTC 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

  • Wiper motor wire

  • Windshield wiper switch relay (WIPER NO.1)

 ○ Main body ECU (multiplex network body ECU)

WIRING DIAGRAM

B0049W4E04

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 power 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 (WIPER MOTOR WIRE - BATTERY)


    1. B004ATMC07
      *a

      Front view of wire harness connector

      (to Wiper Motor Wire)

      Disconnect the wiper motor wire connector.

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

      Standard Voltage
      for LHD
      Tester Connection Switch Condition Specified Condition
      Au1-7 - 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
      for RHD
      Tester Connection Switch Condition Specified Condition
      Au1-6 - 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

    NG

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

    OK

  3. INSPECT WIPER MOTOR WIRE


    1. B004AY6C12
      *A for LHD
      *B for RHD
      *a Windshield Wiper Motor Assembly Side
      *b Wire Harness Side

      Remove the wiper motor wire.

      Click here

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

      Standard Resistance
      for LHD
      Tester Connection Condition Specified Condition
      A-1 (GND) - B-1 Always Below 1 Ω
      A-7 (+B) - B-7 Always Below 1 Ω
      A-6 (LIN) - B-6 Always Below 1 Ω
      for RHD
      Tester Connection Condition Specified Condition
      A-4 (GND) - B-4 Always Below 1 Ω
      A-6 (+B) - B-6 Always Below 1 Ω
      A-7 (LIN) - B-7 Always Below 1 Ω
      Result
      Proceed to
      OK
      NG

    NG

    REPLACE WIPER MOTOR WIRE Click here

    OK

  4. CHECK HARNESS AND CONNECTOR (WIPER MOTOR WIRE - BODY GROUND)


    1. B004ATMC07
      *a

      Front view of wire harness connector

      (to Wiper Motor Wire)

      Disconnect the wiper motor wire connector.

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

      Standard Resistance
      for LHD
      Tester Connection Condition Specified Condition
      Au1-1 - Body ground Always Below 1 Ω
      for RHD
      Tester Connection Condition Specified Condition
      Au1-4 - Body ground 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] - WIPER MOTOR WIRE)


    1. Disconnect the P8 main body ECU (multiplex network body ECU) connector.

    2. Disconnect the Au1 wiper motor wire connector.

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

      Standard Resistance
      for LHD
      Tester Connection Condition Specified Condition
      P8-3 (LIN3) - Au1-6 (LIN) Always Below 1 Ω
      for RHD
      Tester Connection Condition Specified Condition
      P8-3 (LIN3) - Au1-7 (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

  6. INSPECT WINDSHIELD WIPER SWITCH RELAY (WIPER NO.1)


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

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

      Click here

      Result
      Proceed to
      OK
      NG

    NG

    REPLACE WINDSHIELD WIPER SWITCH RELAY (WIPER NO. 1)

    OK

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


    1. B004B7GC01
      *a

      Front view of wire harness connector

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

      Remove the windshield wiper switch relay (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 switch relay (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 switch relay (WIPER NO.1) terminal 5 - Body ground Power switch off 11 to 14 V
      Result
      Proceed to
      OK
      NG

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

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


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

    2. Disconnect the P7 main body ECU (multiplex network body ECU) connector.

    3. Disconnect the Au1 wiper motor wire connector.

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

      Standard Resistance
      for LHD
      Tester Connection Condition Specified Condition
      P7-21 (WPS) - Windshield wiper switch relay (WIPER NO.1) terminal 1 Always Below 1 Ω
      Windshield wiper switch relay (WIPER NO.1) terminal 3 - Au1-7 Always Below 1 Ω
      P7-21 (WPS) or Windshield wiper switch relay (WIPER NO.1) terminal 1 - Body ground Always 10 kΩ or higher
      Windshield wiper switch relay (WIPER NO.1) terminal 3 or Au1-7 - Body ground Always 10 kΩ or higher
      for RHD
      Tester Connection Condition Specified Condition
      P7-21 (WPS) - Windshield wiper switch relay (WIPER NO.1) terminal 1 Always Below 1 Ω
      Windshield wiper switch relay (WIPER NO.1) terminal 3 - Au1-6 Always Below 1 Ω
      P7-21 (WPS) or Windshield wiper switch relay (WIPER NO.1) terminal 1 - Body ground Always 10 kΩ or higher
      Windshield wiper switch relay (WIPER NO.1) terminal 3 or Au1-6 - 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