LIN COMMUNICATION SYSTEM, Diagnostic DTC:B278C

DTC Code DTC Name
B278C Lost Communication with Power Source Control

DESCRIPTION

DTC No. DTC Detection Condition Trouble Area
B278C An internal malfunction occurs in the certification ECU (smart key ECU assembly)

  • Certification ECU (smart key ECU assembly)

Tech Tips

The power management control ECU is built into the certification ECU (smart key ECU assembly).

INSPECTION PROCEDURE

Note


  • When using the intelligent tester to troubleshoot with the ignition switch off:

    Connect the intelligent tester to the DLC3, and turn the courtesy switch on and off at 1.5-second intervals until communication between the intelligent tester and vehicle begins.

  • If the certification ECU (smart key ECU assembly) is replaced, register the keys (refer to the Service Bulletin).

PROCEDURE


  1. CLEAR DTC


    1. Clear the DTCs Click here.


    NEXT

  2. CHECK FOR DTC


    1. Check for DTCs Click here.

      OK
      DTC B278C is not output.

    NG

    REPLACE CERTIFICATION ECU (SMART KEY ECU ASSEMBLY)

    OK

    USE SIMULATION METHOD TO CHECK Click here