Yup, I have a button with LED wired just like you describe and it lights up properly.
Thanks!

Just checked again and if I set View Filter to Hacker there are two things happening when I press Perf mode button:
1. Performance mode button pressed flag will set to Off momentarily while I am...

Yes, I did. As soon as I click Stream, data starts populating. Maybe I did not look good enough. Or engine should be running... I will double check.

Tried checking parameters on Trans tab, but did not see anything change. The engine was not running, ignition was on.

I will be checking tomorrow. Thanks

I hope so. The truck is not on the road yet. It will be a while.
Thank you all for your help!

That parameter did not help. However I changed both of these parameters
Force manual mode in D2 changed from Set to Not Set..
Single Manual/Perf Mode Switch changed from Set to Not Set..
And the...

Update. A/C is kicking in now - I flashed original B-body bin and AC works.
The situation with AC request not working after manually commanding clutch to engage is resolved too - it was just...

Original Fleetwood bin did not want to turn perf. mode on no matter what I have tried. As soon as I flashed Firebird bin (i had to match multiple parameters to original bin, like shift points,...

Steve, you are correct. Thanks

Dave, thank you, I will take a look. Is there a specific parameter you have in mind?

Hi all,
I got a 53 GMC truck with LT1 engine/4L60E transmission and PCM 16188051 out of 94 Fleetwood.
I installed an aftermarket AC system and wanted the compressor clutch to be controlled by PCM....