S light came on -- told it was a bad TCU. I bought a used one / worked for awhile then s light blinked/buzzing under dash/shifted up/down. Did not get looked at for awhile and then the s light stayed on. Took it to a shop and tried to read the codes but the computer did not report any. Fixed a broken capacitor -- worked fine. Now the s light is blinking again.
I think if I looked at the problem sooner I could have read the codes and could have avoided burning out the capacitor and ruining the computer. ?

TCU light is blinking -- not the dash s light because it keeps blinking.

It is blinking 1 short blink followed by 4 sec. then two short blinks then 4 sec. then repeats.
Any suggestions?