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 is detected, DTC B1243 will be output.

Tech Tips

If DTC B1243 is output, the speed-sensitive automatic door lock function, shift-linked automatic door unlock function, and collision door lock release function will be prohibited.

DTC Code DTC Detection Condition Trouble Area
B1243

When either of the following occurs:


  • Collision door lock release function does not operate normally.

  • An open or short in the GSW input circuit of the main body ECU.

  • Harness or connector

  • Center airbag sensor

  • Main body ECU

WIRING DIAGRAM

A01H16UE01

INSPECTION PROCEDURE

PROCEDURE


  1. CHECK DTC OUTPUT


    1. Clear the DTC Click here.

    2. Check for DTC Click here.

      Result
      Result Proceed to
      B1243 output reoccurs A
      B1243 output does not reoccur B

    B

    USE SIMULATION METHOD TO CHECK Click here

    A

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


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

      CAUTION:

      Wait at least 90 seconds after disconnecting the negative (-) terminal cable from the battery to prevent airbag and seat belt pretensioner activation.

      Note

      When disconnecting the cable, some systems need to be initialized after the cable is reconnected Click here.

      A01GXINE01

    2. Disconnect the DA ECU connector.

    3. Disconnect the L73 sensor connector.

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

      Standard resistance
      Tester Connection Condition Specified Condition
      DA-53 (GSW) - L73-18 (GSW) Always Below 1 Ω
      DA-53 (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 negative (-) terminal cable from the battery.

      CAUTION:

      Wait at least 90 seconds after disconnecting the negative (-) terminal cable from the battery to prevent airbag and seat belt pretensioner activation.

      Note

      When disconnecting the cable, some systems need to be initialized after the cable is reconnected Click here.

    2. A01GWG1E01

      Reconnect the DA ECU connector.

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

    4. Turn the power switch ON (IG).

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

      Standard voltage
      Tester Connection Condition Specified Condition
      L73-18 (GSW) - Body ground Power switch ON (IG) 4.5 to 5.5 V

    NG

    REPLACE MAIN BODY ECU

    OK

  4. REPLACE CENTER AIRBAG SENSOR


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

      CAUTION:

      Wait at least 90 seconds after disconnecting the negative (-) terminal cable from the battery to prevent airbag and seat belt pretensioner activation.

      Note

      When disconnecting the cable, some systems need to be initialized after the cable is reconnected Click here.

    2. Replace the center airbag sensor Click here.


    NEXT

  5. CHECK DTC OUTPUT


    1. Recheck for DTC Click here.

      Result
      Result Proceed to
      B1243 output reoccurs A
      B1243 output does not reoccur B

    B

    END

    A

    REPLACE MAIN BODY ECU