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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 speed-sensitive automatic door lock function, shift-linked automatic door lock function, and collision door lock release function will be prohibited.

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

  • Main body ECU (multiplex network body ECU)

  • Center airbag sensor assembly

  • Wire harness or connector
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WIRING DIAGRAM

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INSPECTION PROCEDURE

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PROCEDURE


  1. Click here

    CHECK DTC OUTPUT


    1. Clear the DTCs (Click here).

    2. Check for DTCs.

      OK
      DTC B1243 is not output.

  2. Click here

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


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

      CAUTION:

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

    2. Reconnect the main body ECU (multiplex network body ECU) connector.

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

    4. A01NI2QE05

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

      Standard Voltage
      Tester Connection Condition Specified Condition
      F29-18 (GSW) - Body ground Power switch on (IG) 2.8 to 4.3 V
      Table 1. Text in Illustration
      *1

      Front view of wire harness connector

      (to Center Airbag Sensor Assembly)
      Note:

      Turning the power switch on (IG) with the center airbag sensor assembly connector disconnected causes other DTCs to be stored. Clear the DTCs after performing this inspection.


  3. Click here

    REPLACE CENTER AIRBAG SENSOR ASSEMBLY


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

      CAUTION:

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

    2. Replace the center airbag sensor assembly (Click here).


  4. Click here

    CHECK DTC OUTPUT


    1. Recheck for DTCs (Click here).

      OK
      DTC B1243 is not output.

  5. Click here

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


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

      CAUTION:

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

    2. Disconnect the center airbag sensor assembly connector.

    3. A01NKWOE03

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

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      F29-18 (GSW) - 2A-25 (GSW) Always Below 1 Ω
      2A-25 (GSW) - Body ground Always 10 kΩ or higher
      Table 2. Text in Illustration
      *1

      Front view of wire harness connector

      (to Instrument Panel Junction Block Assembly)
      *2

      Front view of wire harness connector

      (to Center Airbag Sensor Assembly)

  6. Click here

    INSPECT INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY


    1. A01NIMIE02

      Remove the instrument panel junction block assembly.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      A-24 (GSW) - 2A-25 (GSW) Always Below 1 Ω
      2A-25 (GSW) - Body ground Always 10 kΩ or higher
      Table 3. Text in Illustration
      *1

      Front view of wire harness connector

      (to Main Body ECU (Multiplex Network Body ECU))

      		 *2

      Component without harness connected

      (Instrument Panel Junction Block Assembly)

  7. Click here

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

  8. Click here

    REPAIR OR REPLACE HARNESS OR CONNECTOR

  9. Click here

    USE SIMULATION METHOD TO CHECKClick here

  10. Click here

    END (CENTER AIRBAG SENSOR ASSEMBLY WAS DEFECTIVE)

  11. Click here

    REPLACE INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY