LIN COMMUNICATION SYSTEM, Diagnostic DTC:B1249

DTC Code DTC Name
B1249 Double Locking ECU Communication Stop

DESCRIPTION

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

DTC No. DTC Detection Condition Trouble Area
B1249 No communication between the 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

  • Harness or connector

WIRING DIAGRAM

A01UXH2E02

CAUTION / NOTICE / HINT

Note


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

    Connect the GTS to the vehicle, and turn the 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

When communication between the double lock door control relay assembly and main body ECU (multiplex network body ECU) stops, DTC B2325 is also stored.

PROCEDURE


  1. CLEAR DTC


    1. Clear the DTC Click here.


    NEXT

  2. CHECK FOR DTC


    1. Check for DTC Click here.

      Result
      Result Proceed to
      DTC B1249 is output A
      DTC B1249 and B2325 are output B

      Tech Tips

      When both B1249 and B2325 are output at the same time, troubleshoot B2325 first.


    B

    GO TO DIAGNOSTIC TROUBLE CODE CHART Click here

    A

  3. CHECK INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY

    A01UYXHE01
    Text in Illustration
    *a

    Component without harness connected

    (Instrument Panel Junction Block Assembly)

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

    2. Disconnect the instrument panel junction block assembly connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      MB-16 (LIN2) - 3B-26 Always Below 1 Ω
      MB-16 (LIN2) or 3B-26 - Body ground Always 10 kΩ or higher

    NG

    REPAIR OR REPLACE INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY Click here

    OK

  4. CHECK HARNESS AND CONNECTOR INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY - DOUBLE LOCK DOOR CONTROL RELAY ASSEMBLY)


    1. Disconnect the F82 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
      3B-26 - F82-9 (MPX1) Always Below 1 Ω
      3B-26 or F82-9 (MPX1) - Body ground Always 10 kΩ or higher

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  5. CHECK HARNESS AND CONNECTOR (POWER SOURCE CIRCUIT)

    A01UYOZE01
    Text in Illustration
    *a

    Front view of wire harness connector

    (to Double Lock Door Control Relay Assembly)

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

      Standard Voltage
      Tester Connection Switch Condition Specified Condition
      F82-12 (+B) - Body ground Ignition switch off 11 to 14 V
      F82-11 (CPUB) - Body ground Ignition switch off 11 to 14 V

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      F82-7 (GND) - Body ground Always Below 1 Ω

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  6. REPLACE DOUBLE LOCK DOOR CONTROL RELAY ASSEMBLY


    1. Replace the double lock door control relay assembly Click here.


    NEXT

  7. CHECK FOR DTC


    1. Clear the DTC Click here.

    2. Recheck for DTC.

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

    A

    END (DOUBLE LOCK DOOR CONTROL RELAY ASSEMBLY WAS DEFECTIVE)

    B

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