LIN COMMUNICATION SYSTEM, Diagnostic DTC:B1206

DTC Code DTC Name
B1206 P/W Master Switch Communication Stop

DESCRIPTION

This DTC is stored when LIN communication between the multiplex network master Switch assembly and main body ECU (multiplex network body ECU) stops for 10 seconds or more.

DTC Code DTC Detection Condition Trouble Area
B1206 No communication between multiplex network master switch assembly and main body ECU (multiplex network body ECU) for 10 seconds or more.

  • Multiplex network master switch assembly

  • Main body ECU (multiplex network body ECU)

  • Cowl side junction block LH

  • Harness or connector

WIRING DIAGRAM

A01X3B0E01

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.

Tech Tips

DTC B2325 is stored when the communication between the multiplex network master Switch assembly 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 DTCs Click here.

      Result
      Result Proceed to
      DTC B1206 is output A
      DTC B1206 is not output B

    B

    USE SIMULATION METHOD TO CHECK Click here

    A

  3. CHECK HARNESS AND CONNECTOR (MAIN BODY ECU [MULTIPLEX NETWORKBODY ECU] - MULTIPLEX NETWORK MASTERSWITCH ASSEMBLY


    1. Disconnect the A main body ECU connector.

    2. Disconnect the I11*1 or I22*2 multiplex network master switch connector.


      • *1: for LHD

      • *2: for RHD

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

      Standard Resistance
      for LHD
      Tester Connection Condition Specified Condition
      A-16 (LIN2) - I11-17 (LIN1) Always Below 1 Ω
      A-16 (LIN2) or I11-17 (LIN1) - Body ground Always 10 kΩ or higher
      for RHD
      Tester Connection Condition Specified Condition
      A-16 (LIN2) - I22-17 (LIN1) Always Below 1 Ω
      A-16 (LIN2) or I22-17 (LIN1) - Body ground Always 10 kΩ or higher

    NG

    CHECK HARNESS AND CONNECTOR (COWL SIDE JUNCTION BLOCK LH - MULTIPLEX NETWORK MASTER SWITCH ASSEMBLY) Click here

    OK

  4. CHECK HARNESS AND CONNECTOR (MULTIPLEX NETWORK MASTERSWITCH ASSEMBLY BATTERY AND BODY GROUND


    1. A01X2E2E01
      Text in Illustration
      *A for LHD
      *B for RHD
      *a

      Front view of wire harness connector

      (to Master Switch)

      Disconnect the I11*1 or I22*2 multiplex network master switch connector.


      • *1: for LHD

      • *2: for RHD

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

      Standard Resistance
      for LHD
      Tester Connection Condition Specified Condition
      I11-12 (GND) - Body ground Always Below 1 Ω
      for RHD
      Tester Connection Condition Specified Condition
      I22-12 (GND) - Body ground Always Below 1 Ω
      Standard Voltage
      for LHD
      Tester Connection Condition Specified Condition
      I11-11 (B) - Body ground Always 11 to 14 V
      for RHD
      Tester Connection Condition Specified Condition
      I22-11 (B) - Body ground Always 11 to 14 V

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  5. REPLACE MULTIPLEX NETWORK MASTER SWITCH ASSEMBLY


    1. Temporarily replace the multiplex network master switch with a new or normally functioning one Click here.

    2. Clear the DTC Click here.


    NEXT

  6. CHECK FOR DTC


    1. Recheck for DTCs Click here.

      Result
      Result Proceed to
      DTC B1206 is not output A
      DTC B1206 is output (for LHD) B
      DTC B1206 is output (for RHD) C

    A

    END (MULTIPLEX NETWORK MASTER SWITCH ASSEMBLY 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 (COWL SIDE JUNCTION BLOCK LH - MULTIPLEX NETWORK MASTER SWITCH ASSEMBLY)


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

    2. Disconnect the I11*1 or I22*2 multiplex network master switch connector.


      • *1: for LHD

      • *2: for RHD

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

      Standard Resistance
      for LHD
      Tester Connection Condition Specified Condition
      2J-13 - I11-17 (LIN1) Always Below 1 Ω
      2J-13 or I11-17 (LIN1) - Body ground Always 10 kΩ or higher
      for RHD
      Tester Connection Condition Specified Condition
      2J-13 - I22-17 (LIN1) Always Below 1 Ω
      2J-13 or I22-17 (LIN1) - 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