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.

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

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

A01DU9ZE01

INSPECTION PROCEDURE

Note


  • w/ Navigation system:

    After the ignition switch is turned off, the HDD navigation system requires approximately a minute to record various types of memory and settings. As a result, after turning the ignition switch off, wait a minute or more before disconnecting the cable from the negative (-) battery terminal.

  • 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.

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 (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

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  3. CHECK MAIN BODY ECU (GSW VOLTAGE)


    1. A01DUK9E03
      Text in Illustration
      *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 Ignition switch ON 4.5 to 5.5 V

    NG

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

    OK

    REPLACE CENTER AIRBAG SENSOR ASSEMBLY Click here