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 (driver side junction block assembly) stops for more than 10 seconds.

DTC No. DTC Detection Condition Trouble Area
B1206 No communication between the multiplex network master switch assembly and main body ECU (driver side junction block assembly) for more than 10 seconds.

  • Multiplex network master switch assembly

  • Main body ECU (Driver side junction block assembly)

  • Wire harness or connector

  • ECU-B NO. 2 fuse

WIRING DIAGRAM

A01EIVOE12

INSPECTION PROCEDURE

Note

When using the GTS to troubleshoot with the ignition switch off:

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

PROCEDURE


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


    1. A01EJN6E14
      *1

      Front view of wire harness connector

      (to Multiplex Network Master Switch Assembly)

      Disconnect the I6 switch connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      I6-12 (E) - Body ground Always Below 1 Ω
      Standard Voltage
      Tester Connection Condition Specified Condition
      I6-11 (B) - Body ground Always 11 to 14 V

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

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


    1. A01ELI1E08
      Text in Illustration
      *1

      Front view of wire harness connector

      (to Main Body ECU (Driver Side Junction Block Assembly))
      *2

      Front view of wire harness connector

      (to Multiplex Network Master Switch Assembly)

      Disconnect the D48 ECU connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      D48-10 (LIN2) - I6-17 (LIN1) Always Below 1 Ω
      I6-17 (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 (DRIVER SIDE JUNCTION BLOCK ASSEMBLY) Click here

    OK

    END (MULTIPLEX NETWORK MASTER SWITCH ASSEMBLY WAS DEFECTIVE)