LIN COMMUNICATION SYSTEM, Diagnostic DTC:B1249

DTC Code DTC Name
B1249 Double Locking ECU Communication Stop

DESCRIPTION

DTC B1249 is stored when communication between the double lock door control relay assembly and main body ECU (multiplex network body ECU) stops for more than 10 seconds.

DTC Code DTC Detection Condition Trouble Area
B1249 No communication from the double door lock relay assembly for more than 10 seconds.

  • Double lock door control relay assembly

  • Main body ECU (multiplex network body ECU)

  • Cowl side junction block LH

  • Harness or connector

WIRING DIAGRAM

A01X4ZME01

CAUTION / NOTICE / HINT

Note


  • When using the GTS with the ignition switch off to troubleshoot:

    Connect the GTS to the vehicle, and turn a courtesy switch on and off at 1.5 second intervals until communication between the GTS and vehicle begins.

  • Inspect the fuses for circuits related to this system before performing the following inspection procedure.

Tech Tips

DTC B2325 is output when the communication between all of the following components and main body ECU (multiplex network body ECU) stops.

PROCEDURE


  1. CLEAR DTC


    1. Clear the DTC Click here.


    NEXT

  2. CHECK FOR DTC


    1. Recheck for DTC Click here.

      Result:
      Result Proceed to
      DTC B1249 is output A
      DTC B1249 is not output B

    B

    USE SIMULATION METHOD TO CHECK Click here

    A

  3. CHECK HARNESS AND CONNECTOR (DOUBLE LOCK CONTROL RELAY ASSEMBLY - MAIN BODY ECU [MULTIPLEX NETWORK BODY ECU]


    1. Disconnect the A main body ECU connector.

    2. Disconnect the E167 double lock control relay connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      A-16 (LIN2) - E167-9 (MPX1) Always Below 1 Ω
      A-16 (LIN2) or E167-9 (MPX1) - Body ground Always 10 kΩ or higher

    NG

    CHECK HARNESS AND CONNECTOR (DOUBLE LOCK DOOR CONTROL RELAY ASSEMBLY - COWL SIDE JUNCTION BLOCK LH Click here

    OK

  4. CHECK HARNESS AND CONNECTOR (DOUBLE LOCK DOOR CONTROL RELAY ASSEMBLY VOLTAGE AND BODY GROUND)


    1. A01X195E01
      Text in Illustration
      *a

      Front view of wire harness connector

      (to Double Lock Door Control Relay Assembly)

      Disconnect the E167 double lock control relay connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      E167-7 (GND) - Body ground Always Below 1 Ω
      Standard Voltage
      Tester Connection Condition Specified Condition
      E167-11 (CPUB) - Body ground Always 11 to 14 V
      E167-12 (+B) - Body ground Always 11 to 14 V

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  5. REPLACE DOUBLE LOCK DOOR CONTROL RELAY ASSEMBLY


    1. Temporarily replace the double lock door control relay with a new or normally functioning one (See page )*1, Click here*2.


      • *1: for LHD

      • *2: for RHD

    2. Clear the DTC Click here.


    NEXT

  6. CHECK FOR DTC


    1. Recheck for DTCs Click here.

      Result
      Result Proceed to
      DTC B1249 is not output A
      DTC B1249 is output (for LHD) B
      DTC B1249 is output (for RHD) C

    A

    END (DOUBLE LOCK DOOR CONTROL RELAY IS DEFECTIVE)

    B

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

    C

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

  7. CHECK HARNESS AND CONNECTOR (DOUBLE LOCK DOOR CONTROL RELAY ASSEMBLY - COWL SIDE JUNCTION BLOCK LH


    1. Disconnect the 2J cowl side junction block LH connector.

    2. Disconnect the E167 double lock door control relay connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      2J-13 - E167-9 (MPX1) Always Below 1 Ω
      2J-13 or E167-9 (MPX1) - Body ground Always 10 kΩ or higher
      Result
      Result Proceed to
      OK (for LHD) A
      OK (for RHD) B
      NG C

    A

    REPLACE COWL SIDE JUNCTION BLOCK LH Click here

    B

    REPLACE COWL SIDE JUNCTION BLOCK LH Click here

    C

    REPAIR OR REPLACE HARNESS OR CONNECTOR