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.

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

  • Main body ECU (multiplex network body ECU)

  • Driver side junction block assembly

  • Airbag ECU assembly

  • Harness or connector

WIRING DIAGRAM

B0049SPE39
*1 Driver Side Junction Block Assembly
*2 Airbag ECU Assembly
*3 Main Body ECU (Multiplex Network Body ECU)

CAUTION / NOTICE / HINT

Note


  • After turning the power switch off, waiting time may be required before disconnecting the cable from the negative (-) auxiliary battery terminal. Therefore, make sure to read the disconnecting the cable from the negative (-) auxiliary battery terminal notices before proceeding with work.

    Click here

  • If the main body ECU (multiplex network body ECU) is replaced, refer to the Service Bulletin.

  • When DTC B1243 is output, the collision door lock release, shift-linked automatic door lock/unlock and speed-sensitive automatic door lock functions are prohibited.

PROCEDURE


  1. CLEAR DTC


    1. Clear the DTCs.

      Click here


      Body Electrical > Main Body > Clear DTCs
      Result
      Proceed to
      NEXT

    NEXT

  2. CHECK FOR DTC


    1. Recheck for DTCs.

      Click here


      Body Electrical > Main Body > Trouble Codes
      OK
      DTC B1243 is not output.
      Result
      Proceed to
      OK
      NG

    OK

    USE SIMULATION METHOD TO CHECK Click here

    NG

  3. CHECK MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU)


    1. B004CIVC02
      *a

      Front view of wire harness connector

      (to Airbag ECU Assembly)

      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.

      Note

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

    2. Disconnect the airbag ECU assembly connector.

      Click here

    3. Connect the cable to the negative (-) auxiliary battery terminal, and wait for at least 2 seconds.

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

      Standard Voltage
      Tester Connection Switch Condition Specified Condition
      P6-25 (GSW) - Body ground Power switch on (IG) 4.3 to 5.5 V
      Result
      Proceed to
      OK
      NG

    OK

    REPLACE AIRBAG ECU ASSEMBLY Click here

    NG

  4. CHECK HARNESS AND CONNECTOR (DRIVER SIDE JUNCTION BLOCK ASSEMBLY - AIRBAG ECU 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. Disconnect the 3A driver side junction block assembly connector.

    3. Disconnect the P6 airbag ECU assembly connector.

      Click here

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      3A-46 - P6-25 (GSW) Always Below 1 Ω
      3A-46 or P6-25 (GSW) - Body ground Always 10 kΩ or higher
      Result
      Proceed to
      OK
      NG

    NG

    REPLACE HARNESS OR CONNECTOR

    OK

  5. INSPECT DRIVER SIDE JUNCTION BLOCK ASSEMBLY


    1. Remove the driver side junction block assembly.

      Click here

    2. Remove the main body ECU (multiplex network body ECU) from the driver side junction block assembly.

      Click here

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

      B004C2XC03
      *a

      Component without harness connected

      (Driver Side Junction Block Assembly)

      		 - -
      Standard Resistance
      Tester Connection Condition Specified Condition
      A-24 (GSW) - 3A-46 Always Below 1 Ω
      Result
      Proceed to
      OK
      NG

    OK

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

    NG

    REPLACE DRIVER SIDE JUNCTION BLOCK ASSEMBLY Click here