LIN COMMUNICATION SYSTEM, Diagnostic DTC:B126A

DTC Code DTC Name
B126A Remote Engine Starter 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. DTC Detection Condition Trouble Area
B126A 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

A01VZNBE33
*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.

  • If the main body ECU (multiplex network body ECU) is replaced, refer to Service Bulletin.

PROCEDURE


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


    1. Disconnect the H10 main body ECU (multiplex network body ECU) connector.

    2. Disconnect the H151 option connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      H10-25 (BTX) - H151-7 (BTX) Always Below 1 Ω
      H10-26 (BRX) - H151-3 (BRX) Always Below 1 Ω
      H10-26 (BRX) - Body ground Always 10 kΩ or higher
      H151-3 (BRX) - Body ground Always 10 kΩ or higher

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  2. REPLACE OPTION CONNECTOR


    1. Replace the option connector.


    NEXT

  3. CHECK DTC OUTPUT


    1. Clear the DTCs Click here.

    2. Recheck for DTCs.

      OK
      DTC B126A and B1269 are not output.

    OK

    END (OPTION CONNECTOR ECU WAS DEFECTIVE)

    NG

    REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU) Click here