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DTC B2785: Communication Malfunction between ECUs Connected by LIN [08/2013 - ]: Description

WARNING: This page is about a different car, the 2014 Lexus ES 300h. However, it is still accessible from the selected car via links, so may be relevant.

The certification ECU (smart key ECU assembly) monitors communication between all the ECUs connected to the certification bus lines. When the certification ECU (smart key ECU assembly) detects errors in communication with all the ECUs connected to the certification bus lines at a set interval and 3 times in a row, DTC B2785 will be stored.

DTC No. DTC Detection Condition Trouble Area
B2785
  • Errors in LIN communication between ECUs or an open or short in communication lines
  • LIN communication from the certification ECU (smart key ECU assembly) detects errors in communication 3 times in a row.
  • Certification ECU (smart key ECU assembly)
  • Power management control ECU
  • Steering lock ECU (steering lock actuator assembly)
  • ID code box (immobilizer code ECU)
  • Wire harness or connector
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