Toyota Firmware 89663-37370-B
A catalog reference for Toyota firmware identifier 89663-37370-B and its related calibration number.
89663-37370-B is a Toyota automotive firmware identifier related in the catalog to 89663-37370. The 89663 part-number family is associated with engine control software, so an engine control module application is tentative.
What the identifier indicates
Engine control software generally manages functions such as fuel delivery and ignition timing in response to operating conditions. The available catalog entry does not establish the exact vehicle application or identify a specific change made by 89663-37370-B.
The related catalog number appears without the -B suffix. That distinction alone does not establish whether the suffix denotes a particular revision or a modified variant.