Question

[Rubenuds]

Hi there! Anyone now what this button is in my 2018 gmc Denali hd

thank you 

[muddkatt]

Auxiliary roof lamp switch

[aseibel]

Do you have the snow plow prep package? I thought that's the only way you get that button. I wish I had one.

[Rubenuds]

Thank you 

[Rubenuds]

Yes I do have snow plow pre package

[ESMD]

Just be aware, the switch does absolutely nothing until you plug the harness into the back of it. There is a little pilot light on the switch and relay located above the overhead console that will click when the switch is activated. They won't do anything until you plug the harness into the back of the switch. I assume this is so you don't accidentally short out the blunt cut wire to a ground.

I use this to power my mirror mounted radar detector and dash camera.

[Rubenuds]

Thanks for the info. Very helpful. 

[captadamnj]

You can open the sunglasses holder and then gently but firmly pull down on the trim to access the connector that needs to be plugged in and find the blunt cut power lead...you will need to provide ground.