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 No. Detection Item DTC Detection Condition Trouble Area
B1206 P/W Master Switch Communication Stop No communication between multiplex network master switch assembly and main body ECU (multiplex network body ECU) for 10 seconds or more.

  • Driver side junction block assembly

  • Main body ECU (multiplex network body ECU)

  • Front multiplex network door ECU LH (for LHD)

  • Front multiplex network door ECU RH (for RHD)

  • Multiplex network master switch assembly

  • Harness or connector

WIRING DIAGRAM


  1. for LHD

    B004BKME03

  2. for RHD

    B004BKME04

CAUTION / NOTICE / HINT

Note


  • When using the GTS with the power 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 procedure.

  • Recognition code registration is necessary when replacing the main body ECU (multiplex network body ECU).

  • If the main body ECU (multiplex network body ECU) is replaced, refer to the Service Bulletin.

Tech Tips

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

Click here

PROCEDURE


  1. CLEAR DTC


    1. Clear the DTCs.

      Click here


      Body Electrical > Main Body > Clear DTCs
      Result
      Proceed to
      NEXT

    NEXT

  2. CHECK FOR DTC


    1. Check for DTCs.

      Click here


      Body Electrical > Main Body > Trouble Codes
      Result
      Proceed to
      DTC B1206 is output
      DTC B1206 is not output

    DTC B1206 is not output

    USE SIMULATION METHOD TO CHECK Click here

    DTC B1206 is output

  3. CHECK HARNESS AND CONNECTOR (MAIN BODY ECU [MULTIPLEX NETWORK BODY ECU] - MULTIPLEX NETWORK MASTER SWITCH ASSEMBLY)


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

      Click here

    2. Disconnect the U2*1 or T2*2 multiplex network master switch assembly connector.


      • *1: for LHD

      • *2: for RHD

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

      Standard Resistance
      for LHD
      Tester Connection Condition Specified Condition
      A-16 (LIN2) - U2-17 (LIN1) Always Below 1 Ω
      A-16 (LIN2) - Body ground Always 10 kΩ or higher
      for RHD
      Tester Connection Condition Specified Condition
      A-16 (LIN2) - T2-17 (LIN1) Always Below 1 Ω
      A-16 (LIN2) - Body ground Always 10 kΩ or higher
      Result
      Proceed to
      OK
      NG

    NG

    CHECK HARNESS AND CONNECTOR (MAIN BODY ECU [MULTIPLEX NETWORK BODY ECU] - FRONT MULTIPLEX NETWORK DOOR ECU) Click here

    OK

  4. CHECK HARNESS AND CONNECTOR (FRONT MULTIPLEX NETWORK DOOR ECU - BATTERY AND BODY GROUND)

    B004AW1C07
    *A for LHD
    *B for RHD
    *a

    Front view of wire harness connector

    (to Front Multiplex Network Door ECU)

    1. Disconnect the front multiplex network door ECU*1 or front multiplex network door ECU RH*2 connector.


      • *1: for LHD

      • *2: for RHD

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

      Standard Resistance
      for LHD
      Tester Connection Condition Specified Condition
      S9-1 (GND) - Body ground Always Below 1 Ω
      for RHD
      Tester Connection Condition Specified Condition
      R9-1 (GND) - Body ground Always Below 1 Ω

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

      Standard Voltage
      for LHD
      Tester Connection Switch Condition Specified Condition
      S9-6 (BDR) - S9-1 (GND) Power switch off 11 to 14 V
      S9-16 (BCUT) - S9-1 (GND) Power switch off 11 to 14 V
      for RHD
      Tester Connection Switch Condition Specified Condition
      R9-6 (BDR) - R9-1 (GND) Power switch off 11 to 14 V
      R9-16 (BCUT) - R9-1 (GND) Power switch off 11 to 14 V
      Result
      Proceed to
      OK
      NG

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  5. CHECK HARNESS AND CONNECTOR (FRONT MULTIPLEX NETWORK DOOR ECU - MULTIPLEX NETWORK MASTER SWITCH ASSEMBLY)


    • *1: for LHD

    • *2: for RHD


    1. Disconnect the S9 front multiplex network door ECU LH*1 or R9 front multiplex network door ECU RH*2 connector.

    2. Disconnect the U2*1 or T2*2 multiplex network master switch assembly connector.

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

      Standard Resistance
      for LHD
      Tester Connection Condition Specified Condition
      S9-15 (CPBJ) - U2-11 (B) Always Below 1 Ω
      S9-9 (SGND) - U2-12 (GND) Always Below 1 Ω
      S9-15 (CPBJ) - Body ground Always 10 kΩ or higher
      S9-9 (SGND) - Body ground Always 10 kΩ or higher
      for RHD
      Tester Connection Condition Specified Condition
      R9-15 (CPBJ) - T2-11 (B) Always Below 1 Ω
      R9-9 (SGND) - T2-12 (GND) Always Below 1 Ω
      R9-15 (CPBJ) - Body ground Always 10 kΩ or higher
      R9-9 (SGND) - Body ground Always 10 kΩ or higher
      Result
      Proceed to
      OK
      NG

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  6. CHECK FRONT MULTIPLEX NETWORK DOOR ECU

    B004AQRC04
    *A for LHD
    *B for RHD
    *a

    Front view of wire harness connector

    (to Multiplex Network Master Switch Assembly)

    1. Disconnect the multiplex network master switch assembly connector.

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

      Standard Resistance
      for LHD
      Tester Connection Condition Specified Condition
      U2-12 (GND) - Body ground Always Below 1 Ω
      for RHD
      Tester Connection Condition Specified Condition
      T2-12 (GND) - Body ground Always Below 1 Ω

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

      Standard Voltage
      for LHD
      Tester Connection Switch Condition Specified Condition
      U2-11 (B) - Body ground Power switch off 11 to 14 V
      for RHD
      Tester Connection Switch Condition Specified Condition
      T2-11 (B) - Body ground Power switch off 11 to 14 V
      Result
      Result Proceed to
      OK A
      NG (for LHD) B
      NG (for RHD) C

    B

    REPLACE FRONT MULTIPLEX NETWORK DOOR ECU LH Click here

    C

    REPLACE FRONT MULTIPLEX NETWORK DOOR ECU RH Click here

    A

  7. REPLACE MULTIPLEX NETWORK MASTER SWITCH ASSEMBLY


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

      Click here

      Result
      Proceed to
      NEXT

    NEXT

  8. CHECK FOR DTC


    1. Clear the DTC.

      Click here


      Body Electrical > Main Body > Clear DTCs

    2. Check for DTCs.

      Click here


      Body Electrical > Main Body > Trouble Codes
      Result
      Proceed to
      DTC B1206 is not output
      DTC B1206 is output

    DTC B1206 is not output

    END (MULTIPLEX NETWORK MASTER SWITCH ASSEMBLY IS DEFECTIVE)

    DTC B1206 is output

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

  9. CHECK HARNESS AND CONNECTOR (MAIN BODY ECU [MULTIPLEX NETWORK BODY ECU] - FRONT MULTIPLEX NETWORK DOOR ECU)


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

      Click here

    2. Disconnect the S9 front multiplex network door ECU LH*1 or R9 front multiplex network door ECU RH*2 connector.


      • *1: for LHD

      • *2: for RHD

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

      Standard Resistance
      for LHD
      Tester Connection Condition Specified Condition
      A-16 (LIN2) - S9-11 (LIN1) Always Below 1 Ω
      A-16 (LIN2) - Body ground Always 10 kΩ or higher
      for RHD
      Tester Connection Condition Specified Condition
      A-16 (LIN2) - R9-11 (LIN1) Always Below 1 Ω
      A-16 (LIN2) - Body ground Always 10 kΩ or higher
      Result
      Proceed to
      OK
      NG

    NG

    GO TO STEP 11 Click here

    OK

  10. CHECK HARNESS AND CONNECTOR (FRONT MULTIPLEX NETWORK DOOR ECU - MULTIPLEX NETWORK MASTER SWITCH ASSEMBLY)


    • *1: for LHD

    • *2: for RHD


    1. Disconnect the S9 front multiplex network door ECU LH*1 or R9 front multiplex network door ECU RH*2 connector.

    2. Disconnect the U2*1 or T2*2 multiplex network master switch assembly connector.

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

      Standard Resistance
      for LHD
      Tester Connection Condition Specified Condition
      S9-12 (LIN2) - U2-17 (LIN1) Always Below 1 Ω
      S9-12 (LIN2) - Body ground Always 10 kΩ or higher
      for RHD
      Tester Connection Condition Specified Condition
      R9-12 (LIN2) - T2-17 (LIN1) Always Below 1 Ω
      R9-12 (LIN2) - Body ground Always 10 kΩ or higher
      Result
      Proceed to
      OK
      NG

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  11. CHECK HARNESS AND CONNECTOR (DRIVER SIDE JUNCTION BLOCK ASSEMBLY - FRONT MULTIPLEX NETWORK DOOR ECU)


    1. Disconnect the 3D driver side junction block assembly connector.

    2. Disconnect the S9 front multiplex network door ECU LH*1 or R9 front multiplex network door ECU RH*2 connector.


      • *1: for LHD

      • *2: for RHD

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

      Standard Resistance
      for LHD
      Tester Connection Condition Specified Condition
      3D-34 - S9-11 (LIN1) Always Below 1 Ω
      3D-34 - Body ground Always 10 kΩ or higher
      for RHD
      Tester Connection Condition Specified Condition
      3D-34 - R9-11 (LIN1) Always Below 1 Ω
      3D-34 - Body ground Always 10 kΩ or higher
      Result
      Proceed to
      OK
      NG

    OK

    REPLACE DRIVER SIDE JUNCTION BLOCK ASSEMBLY Click here

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR