Toyota Firmware 89663-37100: Calibration Catalog Reference
A concise guide to Toyota firmware identifier 89663-37100 and its related 89663-37100-C catalog entry.
Toyota firmware 89663-37100 belongs to the 89663 calibration-number family, which is associated with software for an electronic control unit. That family alone does not establish the exact controller, vehicle application, or system behavior for this calibration.
Related catalog identifier
The related entry 89663-37100-C retains the complete calibration identifier and adds a -C suffix. The catalog name does not explain what that suffix means, so it does not establish a stock or modified function.
The number identifies a calibration record rather than a documented change in vehicle operation. A vehicle-specific service record or controller identification would be needed to determine what this particular software controls.