Hi guys,
I've got a 1995 Buick Roadmaster wagon that I wired up a momentary push button to engage the transmission's performance mode. One side of button to grey PCM pin 13, other side to ground.*
I also wired an LED to indicate when performance mode is active. - side of LED to red PCM pin 15, + side to +12v source.*
It doesn't seem to work. As soon as ignition key is turned to on position, LED lights up (somewhat dimly) & stays lit, regardless of button is pressed.*
Also there isn't an appreciable difference in shift firmness.
PCM calibration is 16209331
Did I miss something? Do wagon PCMs have this functionality?