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 master switch and main body ECU stops for 10 seconds or more.

DTC Code DTC Detection Condition Trouble Area
B1206 No communication between master switch and main body ECU for 10 seconds or more

  • Master switch

  • Main body ECU

  • Wire harness

WIRING DIAGRAM

A01GMN2E01

INSPECTION PROCEDURE

Note

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

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

Tech Tips

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

PROCEDURE


  1. CLEAR DTC


    1. Delete the DTC Click here.


    NEXT

  2. CHECK FOR DTC


    1. Recheck for DTC Click here.

      Result:
      Result Proceed to
      DTC B1206 output reoccurs A
      DTC B1206 output does not reoccur B

    B

    USE SIMULATION METHOD TO CHECK Click here

    A

  3. CHECK HARNESS AND CONNECTOR (MAIN BODY ECU - MASTER SWITCH)

    A01GK0RE03

    1. Disconnect the L11 ECU connector.

    2. Disconnect the N13 switch connector.

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

      Standard resistance
      Tester Connection Condition Specified Condition
      L11-10 (LIN2) - N13-17 (LIN1) Always Below 1 Ω
      L11-10 (LIN2) or N13-17 (LIN1) - Body ground Always 10 kΩ or higher

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  4. CHECK MASTER SWITCH ASSEMBLY (BATTERY VOLTAGE AND GROUND)


    1. A01GJBDE02

      Disconnect the N13 switch connector.

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

      Standard resistance
      Tester Connection Condition Specified Condition
      N13-12 (GND) - Body ground Always Below 1 Ω
      Standard voltage
      Tester Connection Condition Specified Condition
      N13-11 (B) - Body ground Always 11 to 14 V

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  5. REPLACE MASTER SWITCH ASSEMBLY


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


    NEXT

  6. CHECK FOR DTC


    1. Delete the DTC Click here.

    2. Recheck for DTC Click here.

      Result:
      Result Proceed to
      DTC B1206 output does not reoccur A
      DTC B1206 output reoccurs B

    B

    REPLACE MAIN BODY ECU

    A

    END (MASTER SWITCH IS DEFECTIVE)