LIN COMMUNICATION SYSTEM, Diagnostic DTC:B126A, B1269

DTC Code DTC Name
B126A Remote Engine Starter ECU Communication Stop
B1269 Theft Deterrent ECU Communication Stop

DESCRIPTION

The main body ECU (multiplex network body ECU) communicates with the accessory ECUs via BERKES communication.

These DTCs are stored when communication between the main body ECU (multiplex network body ECU) and accessory ECU stops for 10 seconds or more.

DTC No. Detection Item DTC Detection Condition Trouble Area
B1269 Theft Deterrent ECU Communication Stop No communication between main body ECU (multiplex network body ECU) and accessory ECU for 10 seconds or more.

  • Accessory ECU

  • Main body ECU (multiplex network body ECU)

  • Wire harness or connector
B126A Remote Engine Starter ECU Communication Stop No communication between main body ECU (multiplex network body ECU) and accessory ECU for 10 seconds or more.

  • Accessory ECU

  • Main body ECU (multiplex network body ECU)

  • Wire harness or connector

WIRING DIAGRAM

A012MP3E16
*a Accessory ECU
*b Main Body ECU (Multiplex Network Body ECU)
*c Option Connector

CAUTION / NOTICE / HINT

Note

Before starting repair, check that the power source system of the accessory ECU is not malfunctioning.

PROCEDURE


  1. CHECK HARNESS AND CONNECTOR (MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU) - OPTION CONNECTOR)


    1. Disconnect the E22 main body ECU (multiplex network body ECU) connector.

    2. Disconnect the E25 option connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      E22-25 (BTX) - E25-1 (BTX) Always Below 1 Ω
      E22-26 (BRX) - E25-2 (BRX) Always Below 1 Ω
      E22-25 (BTX) - Body ground Always 10 kΩ or higher
      E22-26 (BRX) - Body ground Always 10 kΩ or higher
      E25-1 (BTX) - Body ground Always 10 kΩ or higher
      E25-2 (BRX) - Body ground Always 10 kΩ or higher
      Result
      Proceed to
      OK
      NG

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  2. REPLACE OPTION CONNECTOR


    1. Replace the option connector.

      Result
      Proceed to
      NEXT

    NEXT

  3. CHECK DTC OUTPUT


    1. Clear the DTCs.

      Click here


      Body Electrical > Main Body > Clear DTCs

    2. Recheck for DTCs.


      Body Electrical > Main Body > Trouble Codes
      OK
      DTC B126A and B1269 are not output.
      Result
      Proceed to
      OK
      NG

    OK

    END (OPTION CONNECTOR WAS DEFECTIVE)

    NG

    REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU) for LHD: Click here
    REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU) for RHD: Click here