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LIN COMMUNICATION SYSTEM, Diagnostic DTC:B1206

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

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

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

  • Master switch assembly

  • Main body ECU

  • Harness or connector
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WIRING DIAGRAM

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INSPECTION PROCEDURE

Note:

When using the intelligent tester with the power 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.

Tip:

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

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PROCEDURE


  1. Click here

    CLEAR DTC


    1. Clear the DTC (see pageClick here).


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    CHECK FOR DTC


    1. Recheck for DTC (see pageClick here).

      Table 1. Result:
      Result Proceed to
      DTC B1206 output reoccurs A
      DTC B1206 output does not reoccur B

  3. Click here

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


    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

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


    1. A01GZEUE02

      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

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    CHECK MASTER SWITCH ASSEMBLY (OPERATION)


    1. Temporarily replace the master switch assembly with a new or normally functioning one (see pageClick here).

    2. Clear the DTC (see pageClick here).


  6. Click here

    CHECK FOR DTC


    1. Recheck for DTC (see pageClick here).

      Table 2. Result:
      Result Proceed to
      DTC B1206 output does not reoccur A
      DTC B1206 output reoccurs B

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    USE SIMULATION METHOD TO CHECKClick here

  8. Click here

    REPAIR OR REPLACE HARNESS OR CONNECTOR

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    REPAIR OR REPLACE HARNESS OR CONNECTOR

  10. Click here

    REPLACE MAIN BODY ECU

  11. Click here

    END (MASTER SWITCH IS DEFECTIVE)