LIN COMMUNICATION SYSTEM, Diagnostic DTC:B1249

DTC Code DTC Name
B1249 Double Locking ECU Communication Stop

DESCRIPTION

The main body ECU (multiplex network body ECU) stores this DTC when communication with the double lock door control relay assembly is interrupted for 10 seconds or more.

DTC No.

Detection Item

DTC Detection Condition

Trouble Area

B1249

Double Locking ECU Communication Stop

No communication between double lock door control relay assembly and main body ECU (multiplex network body ECU) for 10 seconds or more

  • Double lock door control relay assembly

  • Main body ECU (multiplex network body ECU)

  • Instrument panel junction block assembly

  • Wire harness or connector

  • ECU-B NO. 1 fuse

  • D/L NO. 2 fuse

WIRING DIAGRAM

B220699E15

CAUTION / NOTICE / HINT

Note:

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

PROCEDURE

  1. INSPECT INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY

    1. Remove the instrument panel junction block assembly.

      Click hereClick here

      B330524C03

      *a

      Component without harness connected

      (Instrument Panel Junction Block Assembly)

      -

      -

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

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

      Tip:

      This inspection is to check the LIN communication line in the instrument panel junction block assembly that connects the wire harness to the built-in main body ECU (multiplex network body ECU).

      Standard Resistance

      Tester Connection

      Condition

      Specified Condition

      3C-22 - MB-16 (LIN2)

      Always

      Below 1 Ω

    Result

    Proceed to

    OK

    NG
    NG

    REPLACE INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY

    Click hereClick here

    OK

  2. CHECK HARNESS AND CONNECTOR (MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU) - DOUBLE LOCK DOOR CONTROL RELAY ASSEMBLY)

    1. Disconnect the E107 double lock door control relay assembly connector.

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

      Standard Resistance

      Tester Connection

      Condition

      Specified Condition

      3C-22 - E107-9 (MPX1)

      Always

      Below 1 Ω

      E107-9 (MPX1) - Body ground

      Always

      10 kΩ or higher

      3C-22 - Body ground

      Always

      10 kΩ or higher

    Result

    Proceed to

    OK

    NG
    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  3. CHECK HARNESS AND CONNECTOR (DOUBLE LOCK DOOR CONTROL RELAY ASSEMBLY - BATTERY, BODY GROUND)

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

      Standard Voltage

      Tester Connection

      Condition

      Specified Condition

      E107-1 (+B) - E107-14 (GND)

      Always

      11 to 14 V

      E107-7 (CPUB) - E107-14 (GND)

      Always

      11 to 14 V

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

      Standard Resistance

      Tester Connection

      Condition

      Specified Condition

      E107-14 (GND) - Body ground

      Always

      Below 1 Ω

    Result

    Proceed to

    OK

    NG
    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  4. REPLACE DOUBLE LOCK DOOR CONTROL RELAY ASSEMBLY

    1. Replace the double lock door control relay assembly.

      Click hereClick here

    Result

    Proceed to

    NEXT
    NEXT

  5. CHECK DTC OUTPUT

    1. Clear the DTCs.

      Click here

      Body Electrical > Main Body > Clear DTCs

    2. Recheck for DTCs.

      Body Electrical > Main Body > Trouble Codes

      OK

      DTC B1249 is not output.

    Result

    Proceed to

    OK

    NG
    OK

    END (DOUBLE LOCK DOOR CONTROL RELAY ASSEMBLY WAS DEFECTIVE)

    NG

    REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU)

    Click hereClick here