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.

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 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

  • Center airbag sensor assembly

  • Main body ECU (instrument panel junction block assembly)

WIRING DIAGRAM

B217759E03

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.

      Table 1. Result

      Result

      Proceed to

      DTC B1243 is output

      A

      DTC B1243 is not output

      B

    USE SIMULATION METHOD TO CHECK

    (Click here)

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

    1. U122436E02

      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:

      w/ Navigation System (for HDD):

      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.

    2. Disconnect the H80 ECU connector.

    3. Disconnect the H19 sensor connector.

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

      Standard Resistance

      Tester Connection

      Condition

      Specified Condition

      H80-13 (GSW) - H19-18 (GSW)

      Always

      Below 1 Ω

      H80-13 (GSW) - Body ground

      Always

      10 kΩ or higher
      Table 2. Text in Illustration

      *1

      Front view of wire harness connector

      (to Main Body ECU)

      *2

      Front view of wire harness connector

      (to Center Airbag Sensor)

    REPAIR OR REPLACE HARNESS OR CONNECTOR

  3. CHECK MAIN BODY ECU (GSW VOLTAGE)

    1. U122437E02

      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:

      w/ Navigation System (for HDD):

      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.

    2. Disconnect the H19 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

      H19-18 (GSW) - Body ground

      Ignition switch ON

      4.5 to 5.5 V

    REPLACE MAIN BODY ECU (INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY)

  4. REPLACE CENTER 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:

      w/ Navigation System (for HDD):

      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.

    2. Replace the center airbag sensor (Click here).

  5. CHECK FOR DTC

    1. Check for DTCs (Click here).

      Table 3. Result

      Result

      Proceed to

      DTC B1243 is output

      A

      DTC B1243 is not output

      B

    REPLACE MAIN BODY ECU (INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY)

    END (CENTER AIRBAG SENSOR ASSEMBLY WAS DEFECTIVE)