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 Communication between the double lock door control relay assembly and main body ECU (multiplex network body ECU) stops for more than 10 seconds.

  • Double lock door control relay assembly

  • Main body ECU (multiplex network body ECU)

  • Harness or connector

WIRING DIAGRAM

A01DO37E02

INSPECTION PROCEDURE

Note


  • When using the intelligent tester with the ignition switch off to troubleshoot:

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

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

Tech Tips

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

PROCEDURE


  1. CLEAR DTC


    1. Clear the DTCs Click here.


    NEXT

  2. CHECK FOR DTC


    1. Check for DTCs Click here.

      OK
      DTC B1249 is not output.

    NG

    CHECK HARNESS AND CONNECTOR (MAIN BODY ECU - DOUBLE LOCK DOOR CONTROL RELAY) Click here

    OK

    USE SIMULATION METHOD TO CHECK Click here

  3. CHECK HARNESS AND CONNECTOR (MAIN BODY ECU - DOUBLE LOCK DOOR CONTROL RELAY)


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

    2. Disconnect the G49 double lock door control relay assembly connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      A-16 (LIN2) - G49-9 (MPX1) Always Below 1 Ω
      A-16 (LIN2) or G49-9 (MPX1) - Body ground Always 10 kΩ or higher

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

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


    1. A01DR2TE07
      Text in Illustration
      *a

      Front view of wire harness connector

      (to Double Lock Door Control Relay Assembly)

      Disconnect the G49 double lock control relay assembly connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      G49-14 (GND) - Body ground Always Below 1 Ω

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

      Standard Voltage
      Tester Connection Condition Specified Condition
      G49-1 (+B) - Body ground Always 11 to 14 V
      G49-7 (CPUB) - 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 assembly with a new or normally functioning one Click here.


    NEXT

  6. CLEAR DTC


    1. Clear the DTCs Click here.


    NEXT

  7. CHECK FOR DTC


    1. Check for DTCs Click here.

      OK
      DTC B1249 is not output.

    NG

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

    OK

    END (DOUBLE LOCK DOOR CONTROL RELAY IS DEFECTIVE)