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 GWS input circuit of the main body ECU RH (cowl side junction block RH) 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 lock function, and collision door lock release function will be prohibited.

DTC No. DTC Detection Condition Trouble Area
B1243 A malfunction occurs in the GWS input circuit of the main body ECU RH (cowl side junction block RH).

  • Main body ECU RH (Cowl side junction block RH)

  • Center airbag sensor assembly

  • Harness or connector

WIRING DIAGRAM

A015YHFE01

INSPECTION PROCEDURE

PROCEDURE


  1. CHECK DTC OUTPUT


    1. Clear the DTC Click here.

    2. Check for DTC.

      OK
      B1243 output does not reoccur.

    NG

    CHECK HARNESS AND CONNECTOR (CENTER AIRBAG SENSOR - MAIN BODY ECU RH) Click here

    OK

    USE SIMULATION METHOD TO CHECK Click here

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


    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.

    2. Disconnect the center airbag sensor assembly connector.

    3. A01635YE03

      Disconnect the main body ECU RH (cowl side junction block RH) connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      J47-18 (GSW) - RA-7 (GSW) Always Below 1 Ω
      RA-7 (GSW) - Body ground Always 10 kΩ or higher

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  3. CHECK MAIN BODY ECU RH (COWL SIDE JUNCTION BLOCK RH ) (GSW VOLTAGE)


    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.

    2. Reconnect the main body ECU RH (cowl side junction block RH) connector.

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

    4. A016284E01

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

      Standard Voltage
      Tester Connection Condition Specified Condition
      J47-18 (GSW) - Body ground Engine switch on (IG) 4.5 to 5.5 V

      Note

      Turning the engine switch on (IG) with the center air bag sensor assembly connector disconnected causes other DTCs to be stored. Clear the DTCs after performing this inspection.


    NG

    REPLACE MAIN BODY ECU RH (COWL SIDE JUNCTION BLOCK RH)

    OK

  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.

    2. Replace the center airbag sensor assembly Click here.


    NEXT

  5. CHECK DTC OUTPUT


    1. Recheck for DTC Click here.

      OK
      B1243 output does not reoccur.

    NG

    REPLACE MAIN BODY ECU RH (COWL SIDE JUNCTION BLOCK RH)

    OK

    END (CENTER AIR BAG SENSOR ASSEMBLY IS DEFECTIVE)