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It was a $300 option if you had the 7 pin trailer harness. The factory plug is attached to the OBD2 data port harness right there at the right knee bolster. Look up under the dash right there at the OBDII plug and you'll see it if your Expy has the tow package. The factory controller was made by Hayes (Made in USA). If you want one that's just plug and play get a Hayes proportional from eTrailer and off you go.
I have the pigtail that plugs into the factory harness, and am thankful for that, that is why I said hookup was a snap, meaning the electrical connections. What I meant by a factory brake controller is one like this:
Just seems to me they could have included this for those that sprung for the tow package. Since purchasing the Tekonsha unit I have found this, the actual control unit is mounted remotely and just the knob wherever you like, considering ditching the Tekonsha and getting it instead, anyone with any experience with this unit?
https://www.curtmfg.com/part/51170