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 (multiplex network body ECU) stops for 10 seconds or more.

DTC No.

Detection Item

DTC Detection Condition

Trouble Area

B1206

P/W Master Switch Communication Stop

No communication between the multiplex network master switch assembly and main body ECU (multiplex network body ECU) for 10 seconds or more.

  • Multiplex network master switch assembly

  • Main body ECU (multiplex network body ECU)

  • Harness or connector

WIRING DIAGRAM

C211493E42

CAUTION / NOTICE / HINT

Note:

  • When using the intelligent tester with the engine 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 for circuits related to this system before performing the following inspection procedure.

Tip:

When DTC B1206 and B2325 are output simultaneously, perform troubleshooting for DTC B2325 first (Click here).

PROCEDURE

  1. CLEAR DTC

    1. Clear the DTCs

      Click here

      Body Electrical > Main Body > Clear DTCs

    Result

    Result

    NEXT
    NEXT

  2. CHECK FOR DTC

    1. Check for DTCs

      Click here

      Body Electrical > Main Body > Trouble Codes

      OK

      DTC B1206 is not output.

    Result

    Result

    OK

    NG
    OK

    USE SIMULATION METHOD TO CHECK

    Click here

    NG

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

    1. Remove the main body ECU (multiplex network body ECU) from the driver side junction block assembly

      Click hereClick here

    2. Disconnect the K3 multiplex network master switch assembly connector.

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

      Standard Resistance

      Tester Connection

      Condition

      Specified Condition

      A-16 (LIN2) - K3-17 (LIN1)

      Always

      Below 1 Ω

      A-16 (LIN2) or K3-17 (LIN1) - Body ground

      Always

      10 kΩ or higher

    Result

    Result

    OK

    NG
    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

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

    C216963C01

    *a

    Front view of wire harness connector (to Multiplex Network Master Switch Assembly)

    1. Disconnect the K3 multiplex network master switch assembly connector.

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

      Standard Resistance

      Tester Connection

      Condition

      Specified Condition

      K3-12 (GND) - Body ground

      Always

      Below 1 Ω

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

      Standard Voltage

      Tester Connection

      Condition

      Specified Condition

      K3-11 (B) - Body ground

      Always

      11 to 14 V

    Result

    Result

    OK

    NG
    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  5. REPLACE MULTIPLEX NETWORK MASTER SWITCH ASSEMBLY

    1. Temporarily replace the multiplex network master switch assembly with a new or normally functioning one

      Click hereClick here

    Result

    Result

    NEXT
    NEXT

  6. CLEAR DTC

    1. Clear the DTCs

      Click here

      Body Electrical > Main Body > Clear DTCs

    Result

    Result

    NEXT
    NEXT

  7. CHECK FOR DTC

    1. Check for DTCs

      Click here

      Body Electrical > Main Body > Trouble Codes

      OK

      DTC B1206 is not output.

    Result

    Result

    OK

    NG
    OK

    END (MULTIPLEX NETWORK MASTER SWITCH IS DEFECTIVE)

    NG

    REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU)

    Click hereClick here