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 (multiplex network body ECU) is detected, DTC B1243 will be 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 will be prohibited.

DTC No. DTC Detection Condition Trouble Area
B1243 A malfunction occurs in the GSW input circuit of the main body ECU (multiplex network body ECU).

  • Main body ECU (multiplex network body ECU)

  • Center airbag sensor assembly

  • Wire harness or connector

WIRING DIAGRAM

A01NEQWE05

INSPECTION PROCEDURE

PROCEDURE


  1. CHECK DTC OUTPUT


    1. Clear the DTCs Click here.

    2. Check for DTCs.

      OK
      DTC B1243 is not output.

    NG

    CHECK MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU (GSW VOLTAGE)) Click here

    OK

    USE SIMULATION METHOD TO CHECK Click here

  2. CHECK MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU (GSW VOLTAGE))


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

      CAUTION:

      Wait at least 90 seconds after disconnecting the cable from the negative (-) auxiliary battery terminal to disable the SRS system.

    2. Reconnect the main body ECU (multiplex network body ECU) connector.

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

    4. A01NFVWE05
      Text in Illustration
      *1

      Front view of wire harness connector

      (to Center Airbag Sensor Assembly)

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

      Standard Voltage
      Tester Connection Condition Specified Condition
      F29-18 (GSW) - Body ground Power switch on (IG) 2.8 to 4.3 V

      Note

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


    NG

    CHECK HARNESS AND CONNECTOR (CENTER AIRBAG SENSOR - INSTRUMENT PANEL JUNCTION BLOCK) Click here

    OK

  3. REPLACE CENTER AIRBAG SENSOR ASSEMBLY


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

      CAUTION:

      Wait at least 90 seconds after disconnecting the cable from the negative (-) auxiliary battery terminal to disable the SRS system.

    2. Replace the center airbag sensor assembly Click here.


    NEXT

  4. CHECK DTC OUTPUT


    1. Recheck for DTCs Click here.

      OK
      DTC B1243 is not output.

    NG

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

    OK

    END (CENTER AIRBAG SENSOR ASSEMBLY WAS DEFECTIVE)

  5. CHECK HARNESS AND CONNECTOR (CENTER AIRBAG SENSOR - INSTRUMENT PANEL JUNCTION BLOCK)


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

      CAUTION:

      Wait at least 90 seconds after disconnecting the cable from the negative (-) auxiliary battery terminal to disable the SRS system.

    2. Disconnect the center airbag sensor assembly connector.

    3. A01NGNZE03
      Text in Illustration
      *1

      Front view of wire harness connector

      (to Instrument Panel Junction Block Assembly)
      *2

      Front view of wire harness connector

      (to Center Airbag Sensor Assembly)

      Disconnect the main body ECU (multiplex network body ECU) connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      F29-18 (GSW) - 2A-25 (GSW) Always Below 1 Ω
      2A-25 (GSW) - Body ground Always 10 kΩ or higher

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  6. INSPECT INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY


    1. Remove the instrument panel junction block assembly.

      A01NDX1E02

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      A-24 (GSW) - 2A-25 (GSW) Always Below 1 Ω
      2A-25 (GSW) - Body ground Always 10 kΩ or higher
      Text in Illustration
      *1

      Front view of wire harness connector

      (to Main Body ECU (Multiplex Network Body ECU))

      		 *2

      Component without harness connected

      (Instrument Panel Junction Block Assembly)

    NG

    REPLACE INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY

    OK

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