LIN COMMUNICATION SYSTEM, Diagnostic DTC:B1206

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

DESCRIPTION

This DTC is output when LIN communication between the multiplex network master switch assembly and main body ECU stops for more than 10 seconds.

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

  • Multiplex network master switch assembly

  • Main body ECU

  • Wire harness or connector

  • P/W FL fuse*1

  • P/W FR fuse*2

WIRING DIAGRAM

A01CEC5E13

INSPECTION PROCEDURE

Note

When using the intelligent tester to troubleshoot with the engine switch off:

Connect the intelligent tester to the DLC3, and turn the courtesy switch on and off at 1.5-second intervals until communication between the tester and vehicle begins.

PROCEDURE


  1. CHECK HARNESS AND CONNECTOR (MULTIPLEX NETWORK MASTER SWITCH - BATTERY AND BODY GROUND)


    1. Disconnect the J10*1 or I3*2 switch connector.


      • *1: for LHD

      • *2: for RHD

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

      Standard Resistance
      for LHD
      Tester Connection Condition Specified Condition
      J10-12 (GND) - Body ground Always Below 1 Ω
      for RHD
      Tester Connection Condition Specified Condition
      I3-12 (GND) - Body ground Always Below 1 Ω
      Standard Voltage
      for LHD
      Tester Connection Condition Specified Condition
      J10-11 (B) - Body ground Always 11 to 14 V
      for RHD
      Tester Connection Condition Specified Condition
      I3-11 (B) - Body ground Always 11 to 14 V

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR, OR REPLACE FUSE

    OK

  2. CHECK HARNESS AND CONNECTOR (MAIN BODY ECU - MULTIPLEX NETWORK MASTER SWITCH)


    1. Disconnect the G50 ECU connector.

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

      Standard Resistance
      for LHD
      Tester Connection Condition Specified Condition
      G50-10 (LIN2) - J10-17 (LIN1) Always Below 1 Ω
      J10-17 (LIN1) - Body ground Always 10 kΩ or higher
      for RHD
      Tester Connection Condition Specified Condition
      G50-10 (LIN2) - I3-17 (LIN1) Always Below 1 Ω
      I3-17 (LIN1) - Body ground Always 10 kΩ or higher

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  3. REPLACE MULTIPLEX NETWORK MASTER SWITCH ASSEMBLY


    1. Replace the multiplex network master switch assembly Click here.


    NEXT

  4. CHECK DTC OUTPUT


    1. Clear the DTC Click here.

    2. Recheck for DTCs.

      OK
      DTC B1206 is not output.

    NG

    REPLACE MAIN BODY ECU Click here

    OK

    END (MULTIPLEX NETWORK MASTER SWITCH ASSEMBLY IS DEFECTIVE)