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)

  • Instrument panel junction block assembly

  • Airbag ECU assembly

  • Harness or connector

WIRING DIAGRAM

B004TB5E49
*1 Instrument Panel 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.

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  • 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.

  • The vehicle is equipped with a Supplemental Restraint System (SRS) which includes components such as airbags. Before servicing (including removal or installation of parts), be sure to read the precaution for Supplemental Restraint System.

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PROCEDURE


  1. CLEAR DTC


    1. Clear the DTCs.

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

    NEXT

  2. CHECK FOR DTC


    1. Recheck for DTCs.

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      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. 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.

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    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
      G11-25 (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 (INSTRUMENT PANEL 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 5A instrument panel junction block assembly connector.

    3. Disconnect the G11 airbag ECU assembly connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      5A-46 - G11-25 (GSW) Always Below 1 Ω
      5A-46 or G11-25 (GSW) - Body ground Always 10 kΩ or higher
      Result
      Proceed to
      OK
      NG

    NG

    REPLACE HARNESS OR CONNECTOR

    OK

  5. INSPECT INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY


    1. Remove the instrument panel junction block assembly.

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    2. Remove the main body ECU (multiplex network body ECU) from the instrument panel junction block assembly.

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

      B004XQAC05
      *a

      Component without harness connected

      (Instrument Panel Junction Block Assembly)

      		 - -
      Standard Resistance
      Tester Connection Condition Specified Condition
      A-24 (GSW) - 5A-46 Always Below 1 Ω
      Result
      Proceed to
      OK
      NG

    OK

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

    NG

    REPLACE INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY Click here