Need help with ABS

[Dana]

New to this forum.

Plugged in my trailer to my 2004 Yukon. The trailer left lights did not work, so unplugged and cleaned. Plugged back in and all lights are working but the Yukon has ABS, Brake and TC lights on.
Everything seems to be working fine.

Disconnected battery, reconcected TC is now off. Checked ground at driver's door. ok
Cruise is not working so will check brake switch.

Any suggestions?

 

[SLCHOE]

Check Ground G103. This is bolted to the back of the passenger side cylinder head. Remove it, clean it, reinstall it.