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POWER DOOR LOCK CONTROL SYSTEM, Diagnostic DTC:B1243

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DTC Code DTC Name
B1243 GSW Terminal Circuit Malfunction
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DESCRIPTION

If the collision door lock release function does not operate normally, or an open or short in the GSW input circuit of the main body ECU (multiplex network body ECU) is detected, DTC B1243 will be stored.

Tip:

If DTC B1243 is stored, the automatic door lock function, and collision door lock release function will be prohibited.

DTC No. Detection Item DTC Detection Condition Trouble Area
B1243 GSW Terminal Circuit Malfunction A malfunction occurs in the GSW input circuit of the main body ECU (multiplex network body ECU).

  • Main body ECU (multiplex network body ECU)

  • Instrument panel junction block assembly

  • Airbag sensor assembly

  • Wire harness or connector
Table 1. *1 Instrument Panel Junction Block Assembly *2 Airbag Sensor Assembly *3 Main Body ECU (Multiplex Network Body ECU)
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WIRING DIAGRAM

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CAUTION / NOTICE / HINT

Note:

  • After turning the ignition switch off, waiting time may be required before disconnecting the cable from the negative (-) battery terminal. Therefore, make sure to read the disconnecting the cable from the negative (-) battery terminal notices before proceeding with work.

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


    • *: w/ Smart Entry and Start System

  • The vehicle battery supplies power to the main body ECU (multiplex network body ECU) via the door control battery. Therefore, before performing this troubleshooting procedure, make sure to perform an on-vehicle inspection to confirm that the main body ECU (multiplex network body ECU) power source circuit is normal.*

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    • *: w/ Door Control Battery

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PROCEDURE


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    CHECK DTC OUTPUT


    1. Clear the DTCs.


      1. Body Electrical > Main Body > Clear DTCs


    2. Recheck for DTCs.


      1. Body Electrical > Main Body > Trouble Codes


      OK
      DTC B1243 is not output.
      Result
      Proceed to
      OK
      NG

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


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

      CAUTION:

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

      Note:

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

    2. Disconnect the K73 airbag sensor assembly connector.

    3. Connect the cable to the negative (-) battery terminal.

    4. B006XULC01
      *a

      Component without harness connected

      (Airbag Sensor Assembly)

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

      Standard Voltage
      Tester Connection Condition Specified Condition
      K73-25 (GSW) - Body ground Ignition switch ON 4.3 to 5.5 V
      Result
      Proceed to
      OK
      NG

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    CHECK HARNESS AND CONNECTOR (AIRBAG SENSOR ASSEMBLY - INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY)


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

      CAUTION:

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

    2. Disconnect the 3A instrument panel junction block assembly connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      K73-25 (GSW) - 3A-7 Always Below 1 Ω
      3A-7 or K73-25 (GSW) - Other terminals and body ground Always 10 kΩ or higher
      Result
      Proceed to
      OK
      NG

    • OKClick here
    • NG

      REPAIR OR REPLACE HARNESS OR CONNECTOR

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    INSPECT INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY


    1. Remove the instrument panel junction block assembly.

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    2. B00702ZC02
      *a

      Component without harness connected

      (Instrument Panel Junction Block Assembly)

      		 - -

      Remove the main body ECU (multiplex network body ECU).

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      MB-24 (GSW) - 3A-7 Always Below 1 Ω
      Result
      Proceed to
      OK
      NG

    • OK

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

    • NG

      REPLACE INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLYClick here