2008 ls. I would like to change my dome light to an aftermarket led
Unit. Mine is broken and amazon sells a led unit for $17. So how would it wire up. Existing dome light has black ground, grey ?, and blue/grey always hot. So if you are wiring up replacement light what
Goes where? Any help much appreciated

 

The black is ground , the always hot is for a switched at the light feature and the grey? Is for the door switched feature

 

Many thanks!!!

 

Test light does not show power on door switched grey. Fuse is good on interior lights #27 in box. Any ideas?

 

The wiring diagram shows that the grey wire goes to the control switch. I assume that the control switch would be the dimmer control knob located on the center waterfall panel.
Dimmer switch knob turned to the far right position powers on the interior courtesy lamps.

 

Don't forget the lights are controlled by the RAP.

Don't be coming back complaining that the lights glow dimly all night long. The answer lies with the search tool.0

 

Think I figured this out. Wiring hot lead into accessory light postive and negative light lead into grey wire allows dome light replacement to function as per factory. Shut door light dims in 20 second. Open door light comes on.
Many thanks for assistance. John

 

The lights are controlled by the BCM, it supplies ground.