Factory brake controller

[TERROR]

Hey this may be a stupid question but how do i know if my truck has a factory brake controller? 97 tahoe has the factory tow package with transcooler/stage 3 hitch

 

[qlc1964]

the plug will be mounted on a bracket under bumber and it will be round with maby

8 pins in it. then there will be a black box under dash with a adjustment knob for the

electric brakes for the trailer brakes.

but i never heard these suv's having it from the factory