POWER DOOR LOCK CONTROL SYSTEM, Diagnostic DTC:B1243

DTC Code DTC Name
B1243 GSW Terminal Circuit Malfunction

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 (instrument panel junction block assembly) is detected, DTC B1243 is stored.

Tech Tips

If DTC B1243 is stored, the speed-sensitive automatic door lock function, shift-linked automatic door lock function, and collision door lock release function are prohibited.

DTC Code DTC Detection Condition Trouble Area
B1243

When either of the following occurs:


  • An open or short in the GSW input circuit of the main body ECU (instrument panel junction block assembly).

  • The collision door lock release function does not operate normally.

  • Harness or connector

  • Center airbag sensor

  • Main body ECU (instrument panel junction block assembly)

WIRING DIAGRAM

A004SR9E04
*1 Main Body ECU (Instrument Panel Junction Block Assembly)
*2 Center Airbag Sensor

PROCEDURE


  1. CHECK DTC OUTPUT


    1. Clear the DTCs Click here.

    2. Check for DTCs.

      Result
      Result Proceed to
      DTC B1243 is output A
      DTC B1243 is not output B

    B

    USE SIMULATION METHOD TO CHECK Click here

    A

  2. CHECK HARNESS AND CONNECTOR (MAIN BODY ECU - CENTER AIRBAG SENSOR)


    1. A004S6KE02
      Text in Illustration
      *1

      Front view of wire harness connector

      (to Main Body ECU)
      *2

      Front view of wire harness connector

      (to Center Airbag Sensor)

      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 D80 ECU connector.

    3. Disconnect the D10 sensor connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      D80-13 (GSW) - D10-18 (GSW) Always Below 1 Ω
      D80-13 (GSW) - Body ground Always 10 kΩ or higher

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  3. CHECK MAIN 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.

    2. A004NKQE02
      Text in Illustration
      *1

      Front view of wire harness connector

      (to Center Airbag Sensor)

      Disconnect the D10 sensor connector.

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

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

      Standard Voltage
      Tester Connection Switch Condition Specified Condition
      D10-18 (GSW) - Body ground Ignition switch ON 4.5 to 5.5 V

    NG

    REPLACE MAIN BODY ECU (INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY)

    OK

  4. REPLACE CENTER AIRBAG SENSOR 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. Replace the center airbag sensor Click here.


    NEXT

  5. CHECK DTC OUTPUT


    1. Recheck for DTCs Click here.

      Result
      Result Proceed to
      DTC B1243 is output A
      DTC B1243 is not output B

    A

    REPLACE MAIN BODY ECU (INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY)

    B

    END