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 and main body ECU (instrument panel junction block assembly) stops for 10 seconds or more.

DTC Code DTC Detection Condition Trouble Area
B1206 No communication between the master switch and main body ECU (instrument panel junction block assembly) for 10 seconds or more.

  • Power window regulator master switch assembly

  • Main body ECU (instrument panel junction block assembly)

  • Harness or connector

WIRING DIAGRAM

A01ITX1E48

INSPECTION PROCEDURE

Note


  • When using the intelligent tester with the ignition switch off to troubleshoot:

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

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

Tech Tips

When communication between the power window regulator master switch and main body ECU (instrument panel junction block assembly) stops, DTC B2325 is also stored.

PROCEDURE


  1. CLEAR DTC


    1. Clear the DTCs Click here.


    NEXT

  2. CHECK FOR DTC


    1. Check 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 - MASTER SWITCH)

    A01INISE03
    Text in Illustration
    *1 for LHD
    *2 for RHD
    *3

    Front view of wire harness connector

    (to Main Body ECU)
    *4

    Front view of wire harness connector

    (to Master Switch)

    1. Disconnect the H79 ECU connector.

    2. Disconnect the K5*1 or J5*2 switch 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
      H79-23 (LIN2) - K5-17 (LIN1) Always Below 1 Ω
      H79-23 (LIN2) - Body ground Always 10 kΩ or higher
      for RHD
      Tester Connection Condition Specified Condition
      H79-23 (LIN2) - J5-17 (LIN1) Always Below 1 Ω
      H79-23 (LIN2) - Body ground Always 10 kΩ or higher

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  4. CHECK HARNESS AND CONNECTOR (MASTER SWITCH - BATTERY AND BODY GROUND)


    1. A01ISFBE06
      Text in Illustration
      *1 for LHD
      *2 for RHD
      *3

      Front view of wire harness connector

      (to Master Switch)

      Disconnect the K5*1 or J5*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
      K5-12 (GND) - Body ground Always Below 1 Ω
      for RHD
      Tester Connection Condition Specified Condition
      J5-12 (GND) - Body ground Always Below 1 Ω
      Standard Voltage
      for LHD
      Tester Connection Condition Specified Condition
      K5-11 (B) - Body ground Always 11 to 14 V
      for RHD
      Tester Connection Condition Specified Condition
      J5-11 (B) - Body ground Always 11 to 14 V

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  5. REPLACE POWER WINDOW REGULATOR MASTER SWITCH ASSEMBLY


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

    2. Clear the DTCs Click here.


    NEXT

  6. CHECK FOR DTC


    1. Check for DTCs Click here.

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

    B

    REPLACE MAIN BODY ECU (INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY)

    A

    END (POWER WINDOW REGULATOR MASTER SWITCH IS DEFECTIVE)