While I agree with that it does get messy when trying to figure out some of the uplevel stuff. I've had all kinds of weird stuff happen when trying to do things like enable a backup camera or add nav.
I have not done it in several years. . . basically since the ones that required tis2web started showing up. When only the Tech2 was required it was relatively easy. Once the laptop and cellular data and subscriptions come into play I priced it out of what anyone wants to pay. And given the success rate was on the low-rent side of "iffy", I pretty much quit. If the radio they show up with isn't compatible or is broken, etc. the situation devolves into "well can't you try programming it harder?"
That's not low hanging fruit. . . them's rotten apples way up the tree.
On most models, under entertainment , radio, relearn vin.
Some of the older models are just straight under radio
some under body electrical...
Videos I could find on a few models all seemed to just do it instantly. They were mostly older vehicles tho.
J2534 and SPS subscription. It’s $40 a vin not $50 a day. The used ones I’ve done had the vin from the vehicle it came from on the salvage yard stock tag. Also, the salvage yard will frequently put it on the receipt.
It’s more important to know the RPO code for the vehicle it’s going into than the one it came from. I have a list of GM rpo codes and then it’s just a matter of finding the sticker on the vehicle.
You can find the rpo code list on Google. I charge the same as flashing a computer.