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

  • Airbag sensor assembly

  • Main body ECU (instrument panel junction block assembly)

WIRING DIAGRAM

A00573OE02
*1 Airbag Sensor Assembly
*2 Main Body ECU (Instrument Panel Junction Block Assembly)

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 Click here.

  • When disconnecting the cable from the negative (-) battery terminal while performing repairs, some systems need to be initialized after the cable is reconnected Click here.

  • As the door control battery is installed between the vehicle battery and main body ECU (instrument panel junction block assembly), first perform the inspections in On-Vehicle Inspection to confirm that there are no malfunctions in the power source circuit for the main body ECU (instrument panel junction block assembly) before performing this troubleshooting procedure Click here.

PROCEDURE


  1. CHECK FOR DTC


    1. Clear the DTCs Click here.

    2. Check for DTCs Click here.

      OK
      DTC B1243 is not output.

    OK

    USE SIMULATION METHOD TO CHECK Click here

    NG

  2. CHECK MAIN BODY ECU (INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY) (GSW VOLTAGE)


    1. A0056F9E02
      Text in Illustration
      *a

      Rear view of wire harness connector

      (to Airbag Sensor Assembly)

      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 ECU assembly connector disconnected causes other DTCs to be stored. Clear the DTCs after performing this inspection.

    2. Disconnect the airbag sensor assembly connector Click here.

    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

    OK

    REPLACE AIRBAG SENSOR ASSEMBLY Click here

    NG

  3. CHECK HARNESS AND CONNECTOR (MAIN BODY ECU [INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY] - 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.

      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 D80 main body ECU (instrument panel junction block assembly) connector.

    3. Disconnect the D10 airbag sensor assembly connector Click here.

    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) or D10-18 (GSW) - Body ground Always 10 kΩ or higher

    NG

    REPLACE INSTRUMENT PANEL WIRE

    OK

  4. REPLACE MAIN BODY ECU (INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY)


    1. Replace the main body ECU (instrument panel junction block assembly) with new or known good one.


    NEXT

  5. CHECK DTC OUTPUT


    1. Clear the DTCs Click here.

    2. Check for DTCs Click here.

      OK
      DTC B1243 is not output.

    OK

    REPLACE AIRBAG SENSOR ASSEMBLY Click here

    NG

    END (MAIN BODY ECU [INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY] WAS DEFECTIVE)