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 (driver side junction block assembly) is detected, DTC B1243 is 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 are prohibited.

DTC No.

Detection Item

DTC Detection Condition

Trouble Area

B1243

GSW Terminal Circuit Malfunction

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

  • Harness or connector

  • Main body ECU (multiplex network body ECU)

WIRING DIAGRAM

B243229E01

CAUTION / NOTICE / HINT

Note:

  • After turning the engine switch off, waiting time may be required before disconnecting the cable from the battery terminal. Therefore, make sure to read the disconnecting the cable from the battery terminal notice before proceeding with work (Click here).

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

PROCEDURE

  1. CHECK FOR DTC

    1. Clear the DTCs.

      Click here

      Body Electrical > Main Body > Clear DTCs

    2. Check for DTCs.

      Click here

      Body Electrical > Main Body > Trouble Codes

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

    2. Remove the main body ECU.

      Click here

    3. Disconnect the G1 center airbag sensor connector.

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

      Standard Resistance

      Tester Connection

      Condition

      Specified Condition

      G1-18 (GSW) - A-24 (GSW)

      Always

      Below 1 Ω

      G1-18 (GSW) - Body ground

      Always

      10 kΩ or higher

      Result

      Result

      OK

      NG
    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  3. CHECK MAIN BODY ECU (GSW VOLTAGE)

    1. B217761C01

      *a

      Front view of wire harness connector

      (to Center Airbag Sensor)

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

    2. Disconnect the G1 center airbag 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

      G1-18 (GSW) - Body ground

      Engine switch on (IG)

      4.5 to 5.5 V

    Result

    Result

    OK

    NG
    OK

    REPLACE AIRBAG SENSOR ASSEMBLY

    Click here

    NG

    REPLACE MULTIPLEX NETWORK BODY ECU (MULTIPLEX NETWORK BODY ECU)

    Click here