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Also make sure the continuous 12V is applied to the TCM, there are two 12V feeds one is switched and one is continuous.
That would be wire 537D and pin Z on the TCM connector.
Do you have the trans supplement?
Did you let the codes finish?
It will flash 12 three times then give the codes, if there are no codes it will flash 12 four times then stop.
EDIT, if there are codes it will flash 12 three times, then each code three times then after all the codes are flashed it will flash 12 one more time then...