Toyota Firmware 89536-41012: Transmission Shift Quality
Toyota calibration 89536-41012 is identified as an updated transmission control module calibration for shift-quality concerns on 2008–2009 Avalon models.
89536-41012 is a Toyota transmission control module (TCM) calibration associated with shift quality. Toyota service records identify the full calibration ID as 895364101200 and list it as an updated calibration for 2008 and 2009 Toyota Avalon vehicles. The TCM manages automatic-transmission operation, including shift timing and the control decisions that shape how gear changes feel during driving.
What the calibration affects
Shift quality is the driver’s experience of a transmission changing gears: shifts may feel smooth and appropriately timed, or seem abrupt, delayed, or otherwise inconsistent. A TCM calibration contains software parameters used in managing transmission behavior. In practice, a revised calibration can change how the controller coordinates shifts, with the aim of addressing a documented shift-quality concern.
Toyota’s records list 895364101200 as updated in both T-SB-0050-09, released January 22, 2009, and T-TCI-3113, released January 28, 2009. Both records identify the transmission control module and shift quality as the topic, and both name the 2008 and 2009 Avalon in their bulletin scope. Because these records mark this calibration as the updated version, any improvement discussed in those bulletins belongs to the revised calibration and should not be attributed to an earlier version.
Reading the catalog filenames
The supplied filenames, 89536-41012.bin and 89536-41012 (2).bin, share the same Toyota calibration number. The “(2)” suffix distinguishes a catalog filename; it does not establish a separate vehicle application or a different named transmission function. The service record’s full identifier, 895364101200, provides the more complete calibration reference.
Practical diagnostic context
For an Avalon with a shift-quality complaint, this identifier is relevant to the transmission-control side of diagnosis. A calibration reference alone does not establish that every rough or delayed shift is caused by software. Technicians assess the vehicle’s symptoms and applicable Toyota service information to determine whether the bulletin’s conditions and calibration update apply. The records support an Avalon shift-quality association, but do not establish fitment for other models simply because they may use a related transmission or controller.