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 (multiplex network body ECU) 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 No. DTC Detection Condition Trouble Area
B1243

Either condition is met:


  • An open or short in the GSW input circuit of the main body ECU (multiplex network body ECU).

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

  • Center Airbag sensor assembly

  • Wire harness or connector

  • Main body ECU (multiplex network body ECU)

WIRING DIAGRAM

A005JP5E04
*1 MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU
*2 INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY
*3 CENTER AIRBAG SENSOR ASSEMBLY

CAUTION / NOTICE / HINT

CAUTION:

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

PROCEDURE


  1. CHECK FOR DTC


    1. Clear the DTCs Click here.

    2. Check for DTCs Click here.

      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 (INSTRUMENT PANEL JUNCTION BLOCK - CENTER AIRBAG SENSOR)


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

    2. Disconnect the F16 center airbag sensor assembly connector.

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

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

      Standard Resistance (Check for Open)
      Tester Connection Condition Specified Condition
      F16-18 (GSW) - 3A-47 Always Below 1 Ω
      Standard Resistance (Check for Short)
      Tester Connection Condition Specified Condition
      F16-18 (GSW) - Body ground Always 10 kΩ or higher

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  3. INSPECT INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY


    1. Remove the instrument panel junction block assembly Click here.

    2. Remove the main body ECU (multiplex network body ECU) from the instrument panel junction block assembly.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      MB-24 (GSW) - 3A-47 Always Below 1 Ω

    NG

    REPLACE INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY Click here

    OK

  4. CHECK CENTER AIRBAG SENSOR ASSEMBLY


    1. A005GR1E01
      Text in Illustration
      *a

      Front view of wire harness connector

      (to Center Airbag Sensor Assembly)

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

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

      Standard Voltage
      Tester Connection Switch Condition Specified Condition
      F16-18 (GSW) - Body ground Ignition switch ON 4.5 to 5.5 V

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

    4. Connect the F16 center airbag sensor assembly connector.

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


    OK

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

    NG

    REPLACE CENTER AIRBAG SENSOR ASSEMBLY Click here