Toyota and Lexus Firmware 89663-F0385
Catalog reference for Toyota and Lexus firmware identifier 89663-F0385 and its calibration-number family.
89663-F0385 is a Toyota calibration identifier in the 89663 software-number family. This family is associated with engine control module calibrations, so an engine-control application is plausible, but the exact module and vehicle application cannot be established from this identifier alone.
An engine control module manages functions such as fuel delivery, ignition timing and emissions controls. Those are general responsibilities of the controller, not confirmed changes made by revision 89663-F0385.