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DTC B1243-00: Impact Detection Sensor Circuit Malfunction [11/2023 - ]: Procedure

  1. CLEAR DTC 
    1. Clear the DTCs.

      Body Electrical > Main Body > Clear DTCs 

      Result

      Proceed to
      NEXT

    Result: 

    NEXT 

    See step  2

  2. CHECK DTC OUTPUT 
    1. Recheck for DTCs.

      Body Electrical > Main Body > Trouble Codes 

      Result

      Result  Proceed to
      B1243-00 is not output A
      B1243-00 is output B

    Result: 

    A 

    USE SIMULATION METHOD TO CHECK. Refer to  HOW TO PROCEED WITH TROUBLESHOOTING [12/2019 - ] 

    Result: 

    B 

    See step  3

  3. CHECK MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU) (GSW VOLTAGE) 

    Pre-procedure1

    1. Disconnect the cable from the negative (-) auxiliary battery terminal.
      WARNING:

      Wait at least 90 seconds after disconnecting the cable from the negative (-) auxiliary battery terminal to disable the SRS system.

      NOTE:

      Turning the ignition switch to ON with the airbag ECU assembly connector disconnected causes other DTCs to be stored. Clear the DTCs after performing this inspection.

    2. Disconnect the H58 airbag ECU assembly connector.
    3. Connect the cable to the negative (-) auxiliary battery terminal.

      Post-procedure1

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

      Standard Voltage

      Tester Connection Condition Specified Condition
      H58-25 (GSW) - Body ground Ignition switch ON 4.3 to 5.5 V

      Result

      Proceed to
      OK
      NG
      GTY1180984Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Front view of wire harness connector
      (to Airbag ECU Assembly)

      Procedure1

    5. None

    Result: 

    NG 

    See step  7

    Result: 

    OK 

    See step  4

  4. REPLACE AIRBAG ECU ASSEMBLY 

    Pre-procedure1

    1. Disconnect the cable from the negative (-) auxiliary battery terminal.
      WARNING:

      Wait at least 90 seconds after disconnecting the cable from the negative (-) auxiliary battery terminal to disable the SRS system.

      Procedure1

    2. Replace the airbag ECU assembly.

      HINT: 

      Refer to REMOVAL [11/2023 - ]

      Result

      Proceed to
      NEXT

      Post-procedure1

    3. None

    Result: 

    NEXT 

    See step  5

  5. CLEAR DTC 
    1. Clear the DTCs.

      Body Electrical > Main Body > Clear DTCs 

      Result

      Proceed to
      NEXT

    Result: 

    NEXT 

    See step  6

  6. CHECK DTC OUTPUT 
    1. Recheck for DTCs.

      Body Electrical > Main Body > Trouble Codes 

      Result

      Result  Proceed to
      B1243-00 is not output A
      B1243-00 is output B

    Result: 

    A 

    END (AIRBAG ECU ASSEMBLY WAS DEFECTIVE) 

    Result: 

    B 

    REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU). Refer to  REMOVAL [11/2023 - ] 

  7. CHECK HARNESS AND CONNECTOR (AIRBAG ECU ASSEMBLY - POWER DISTRIBUTION BOX ASSEMBLY) 

    Pre-procedure1

    1. Disconnect the cable from the negative (-) auxiliary battery terminal.
      WARNING:

      Wait at least 90 seconds after disconnecting the cable from the negative (-) auxiliary battery terminal to disable the SRS system.

    2. Disconnect the 8C power distribution box assembly connector.

      Procedure1

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

      Standard Resistance

      Tester Connection Condition Specified Condition
      H58-25 (GSW) - 8C-43 Always Below 1 Ω
      H58-25 (GSW) or 8C-43 - Other terminals and body ground Always 10 kΩ or higher

      Result

      Proceed to
      OK
      NG

      Post-procedure1

    4. None

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

    Result: 

    OK 

    See step  8

  8. INSPECT POWER DISTRIBUTION BOX ASSEMBLY 

    Pre-procedure1

    1. Remove the power distribution box assembly.

      HINT: 

      Refer to REMOVAL [11/2023 - ]

    2. Remove the main body ECU (multiplex network body ECU).
      GTY1178631Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Component without harness connected
      (Power Distribution Box Assembly)      		 - -

      Procedure1

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

      Standard Resistance

      Tester Connection Condition Specified Condition
      MB-20 (GSW) - 8C-43 Always Below 1 Ω

      Result

      Proceed to
      OK
      NG

      Post-procedure1

    4. None

    Result: 

    OK 

    REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU). Refer to  REMOVAL [11/2023 - ] 

    Result: 

    NG 

    REPLACE POWER DISTRIBUTION BOX ASSEMBLY. Refer to  REMOVAL [11/2023 - ] 

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