DTC B2785: Communication Malfunction between ECUs Connected by LIN: Description

WARNING: This page is about a different car, the 2011 Toyota Corolla. 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 ECU system LIN bus lines. When the certification ECU (smart key ECU assembly) detects an error in communication with all the ECUs connected to the certification ECU system LIN bus lines at a set interval and 3 times in a row, DTC B2785 will be output.

DTC No.	DTC Detection Condition	Trouble Area
B2785	Error in LIN communication between ECUs and an open or short in communication lines LIN communication from the certification ECU (smart key ECU assembly) stops for a set amount of time or more	Certification ECU (smart key ECU assembly) Main body ECU (instrument panel junction block) Steering lock ECU (steering lock actuator assembly) ID code box (immobilizer code ECU) Wire harness or connector