Toyota Firmware 89663-37390: Calibration Catalog Reference
A concise reference to Toyota calibration identifier 89663-37390 and its related catalog variant, 89663-37390-B.
89663-37390 is a Toyota-family software calibration identifier. Its part-number family is associated with electronic control calibrations, but the complete identifier and the available catalog name do not establish a specific control module, vehicle application or software function.
Related catalog entry
The related filename 89663-37390-B shares the full calibration identifier and adds a -B suffix. The suffix distinguishes the catalog entry, but its meaning and any change from the base identifier are not established by the filename alone.
The identifier is useful for matching calibration records, but it does not by itself establish compatibility with a particular Toyota or Lexus vehicle.