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Hello, it is not mandatory per Toyota or at least not shown that way but in a way it is in TSB's. In our shop we try to do this every time we do and alignment or change a suspension part and some customers do not wantt to pay for the recommend and to date none have returned with any issues, It is a recommend and a high recommend by me as it is a step that should be done, It requires recal of the yaw rate sensor and SAS. mandatory? no, recommend? yes.
yes, 100% and tsb SB0020-08 is some information on calibration
this what I was trying to explain, It si NOT or was not a required thing to do, A TSB is issued after x number of problems or complaints say after and alignment, Toyota goes back and changes some things, Alignment specs may be one and recal on some things like SAS. I do not have the answer as to why or when or how they determined all this, I can only reference my thoughts from many years doing this, I can not say whay they say a module or $4000 I am not there of course, I can only say, if no problems beforehand? one should back up, recheck alignment and do the recals as mentioned in docs I sent, If they affected or damaged something? then that is a whole different thing. I dont know how they performed recals or tests or conducted alignment . I am trying to help as to supply the informatyion as I know it is. maybe? an error on their end, seems cooincidental to me
Honestly? I have sent you all I can. I can only say this is not normal. You dont do and alignment and then a $4000 module. Soemone messed up and I dont have information on how they tested etc, If the moduel has failed? it would not be from a simple reset recal. best answer? no it does not seem right, I specialize on alignments and never had this happen to date. Just does not add up, I really wish I had more, I undertsand fact finding and you want 100% answer but that is not possible. I am not running tests and looking at vehicle. You added new information to the question but this addon makes things that much more complex from my end. I had said the recal is NOT required but recommend. Alignment specs changed at some point, after that and now a 4K module? sure sounds to me the original shop did something wrong Just my .02