Back up lines not showing

[Onenicedenali]

I installed an after market head unit on my ‘12 Denali. The camera works but, the guide lines do not. In the DIC, I see no way to turn them on.
I believe I turned them off with my factory radio still installed and locked that setting in. Is there a way to turn them back on without reinstalling the factory head unit?

 

[petethepug]

The back up grid lines are in the software of the head unit itself. If your new head unit has that feature, then it just needs to be turned on.