2019 Tahoe Integrated Trailer Brake Controller Question

[Ziggy1949]

Hello

New to the forum, just took delivery of a 2019 Tahoe LS Custom, and I made sure it had the Max Tow Package.

 

this includes an integrated brake controller.

 

I'm still breaking in the Tahoe, only 100 miles on it so far, but today I hooked it up to my trailer to check things out.

All the lights work as expected on the trailer.

 

Tested the built-in trailer brake controller:

 

Pushing the gain controls or the manual lever triggers the display on the speedometer area.

Pressing the gain up/down buttons produces what you'd expect on the display: gain increases or decreases.

 

BUT:  Moving the manual operation lever does nothing, the 'output' line on the display does not move. 

 

I would expect it should.    With gain at max and the manual lever held to max, the trailer moves, brakes don't seem to be applied. They were working fine when I last used it with my prior vehicle.

Tried with trailer mode engaged and displayed, no difference, trailer plugged in, no difference.

 

I haven't done any more testing yet, thought I'd ask first if the output should move without a trailer attached.

 

Or if there is something that needs to be configured to enable the controller, found nothing in the Owner's Manual about that... 

 

Any help appreciated...