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 power window regulator 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 power window regulator master switch assembly and main body ECU (multiplex network body ECU) for 10 seconds or more.

  • Power window regulator master switch assembly

  • Main body ECU (multiplex network body ECU)

  • Multiplex network door ECU LH (for LHD)

  • Multiplex network door ECU RH (for RHD)

  • Cowl side junction block LH

  • Harness or connector

WIRING DIAGRAM

B002D6ZE06
B002D6ZE07

CAUTION / NOTICE / HINT

Note


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

    Connect the GTS to the vehicle, and turn a courtesy switch on and off at 1.5 seconds intervals until communication between the GTS and vehicle begins.

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

  • 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
      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 NETWORK BODY ECU) - POWER WINDOW REGULATOR MASTER SWITCH ASSEMBLY)


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

      Click here

    2. Disconnect the O10*1 or N30*2 power window regulator 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
      MB-16 (LIN2) - O10-17 (LIN1) Always Below 1 Ω
      MB-16 (LIN2) or O10-17 (LIN1) - Body ground Always 10 kΩ or higher
      for RHD
      Tester Connection Condition Specified Condition
      MB-16 (LIN2) - N30-17 (LIN1) Always Below 1 Ω
      MB-16 (LIN2) or N30-17 (LIN1) - 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 (POWER WINDOW REGULATOR MASTER SWITCH ASSEMBLY - POWER SOURCE CIRCUIT)


    1. B002D56C18
      *A for LHD
      *B for RHD
      *a

      Front view of wire harness connector

      (to Power Window Regulator Master Switch Assembly)

      Disconnect the power window regulator 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
      O10-12 (GND) - Body ground Always Below 1 Ω
      for RHD
      Tester Connection Condition Specified Condition
      N30-12 (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 Condition Specified Condition
      O10-11 (B) - Body ground Always 11 to 14 V
      for RHD
      Tester Connection Condition Specified Condition
      N30-11 (B) - Body ground Always 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 - BATTERY AND BODY GROUND)


    1. B002C7YC40
      *A for LHD
      *B for RHD
      *a

      Front view of wire harness connector

      (to Multiplex Network Door ECU)

      Disconnect the front multiplex network door ECU LH*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
      O4-1 (GND) - Body ground Always Below 1 Ω
      for RHD
      Tester Connection Condition Specified Condition
      N24-1 (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
      O4-6 (BDR) - Body ground Always 11 to 14 V
      O4-16 (BCUT) - Body ground Always 11 to 14 V
      for RHD
      Tester Connection Switch Condition Specified Condition
      N24-6 (BDR) - Body ground Always 11 to 14 V
      N24-16 (BCUT) - Body ground Always 11 to 14 V
      Result
      Proceed to
      OK
      NG

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  6. CHECK HARNESS AND CONNECTOR (FRONT MULTIPLEX NETWORK DOOR ECU - POWER WINDOW REGULATOR MASTER SWITCH ASSEMBLY)


    1. Disconnect the O4 front multiplex network door ECU LH*1 or N24 front multiplex network door ECU RH*2 connector.


      • *1: for LHD

      • *2: for RHD

    2. Disconnect the O10*1 or N30*2 power window regulator 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
      O4-15 (CPBJ) - O10-11 (B) Always Below 1 Ω
      O4-9 (SGND) - O10-12 (GND) Always Below 1 Ω
      O4-15 (CPBJ) - Body ground Always 10 kΩ or higher
      for RHD
      Tester Connection Condition Specified Condition
      N24-15 (CPBJ) - N30-11 (B) Always Below 1 Ω
      N24-9 (SGND) - N30-12 (GND) Always Below 1 Ω
      N24-15 (CPBJ) - Body ground Always 10 kΩ or higher
      Result
      Proceed to
      OK
      NG

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  7. CHECK FRONT MULTIPLEX NETWORK DOOR ECU


    1. Disconnect the power window regulator master switch assembly connector.

    2. B002D56C17
      *A for LHD
      *B for RHD
      *a

      Front view of wire harness connector

      (to power window regulator master switch assembly)

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

      Standard Resistance
      for LHD
      Tester Connection Condition Specified Condition
      O10-12 (GND) - Body ground Always Below 1 Ω
      for RHD
      Tester Connection Condition Specified Condition
      N30-12 (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 Condition Specified Condition
      O10-11 (B) - Body ground Always 11 to 14 V
      for RHD
      Tester Connection Condition Specified Condition
      N30-11 (B) - Body ground Always 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

  8. REPLACE POWER WINDOW REGULATOR MASTER SWITCH ASSEMBLY


    1. Temporarily replace the power window regulator master switch assembly with a new or normally functioning one.

      Click here

    2. Clear the DTCs.

      Click here


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

    NEXT

  9. CHECK FOR DTC


    1. Check for DTCs.

      Click here


      Body Electrical > Main Body > Clear DTCs
      Result
      Result Proceed to
      DTC B1206 is not output A
      DTC B1206 is output B

    A

    END (POWER WINDOW REGULATOR MASTER SWITCH ASSEMBLY WAS DEFECTIVE)

    B

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

  10. 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 cowl side junction block LH.

      Click here

    2. Disconnect the O3 front multiplex network door ECU LH*1 or N3 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
      MB-16 (LIN2) - O3-18 (LIN1) Always Below 1 Ω
      MB-16 (LIN2) - Body ground Always 10 kΩ or higher
      for RHD
      Tester Connection Condition Specified Condition
      MB-16 (LIN2) - N3-18 (LIN1) Always Below 1 Ω
      MB-16 (LIN2) - Body ground Always 10 kΩ or higher
      Result
      Proceed to
      OK
      NG

    NG

    GO TO STEP 12 Click here

    OK

  11. CHECK HARNESS AND CONNECTOR (FRONT MULTIPLEX NETWORK DOOR ECU - POWER WINDOW REGULATOR MASTER SWITCH ASSEMBLY ASSEMBLY)


    1. Disconnect the O3 front multiplex network door ECU LH*1 or N3 front multiplex network door ECU RH*2 connector.


      • *1: for LHD

      • *2: for RHD

    2. Disconnect the O10*1 or N30*2 power window regulator 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
      O3-8 (LIN2) - O10-17 (LIN1) Always Below 1 Ω
      O3-8 (LIN2) - Body ground Always 10 kΩ or higher
      for RHD
      Tester Connection Condition Specified Condition
      N3-8 (LIN2) - N30-17 (LIN1) Always Below 1 Ω
      N3-8 (LIN2) - Body ground Always 10 kΩ or higher
      Result
      Result Proceed to
      NG A
      OK (for LHD) B
      OK (for RHD) C

    B

    REPLACE FRONT MULTIPLEX NETWORK DOOR ECU LH Click here

    C

    REPLACE FRONT MULTIPLEX NETWORK DOOR ECU RH Click here

    A

  12. CHECK HARNESS AND CONNECTOR (COWL SIDE JUNCTION BLOCK LH - FRONT MULTIPLEX NETWORK DOOR ECU)


    1. Disconnect the O3 front multiplex network door ECU LH*1 or N3 front multiplex network door ECU RH*2 connector.


      • *1: for LHD

      • *2: for RHD

    2. Disconnect the 5C*1 or 5A*2 cowl side junction block LH 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
      5C-28 - O3-18 (LIN1) Always Below 1 Ω
      5C-28 - Body ground Always 10 kΩ or higher
      for RHD
      Tester Connection Condition Specified Condition
      5A-56 - N3-18 (LIN1) Always Below 1 Ω
      5A-56 - Body ground Always 10 kΩ or higher
      Result
      Proceed to
      OK
      NG

    OK

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    NG

    REPLACE COWL SIDE JUNCTION BLOCK LH Click here