On my 1996 Deville at night all the light are working fine at start up, after a few minutes the lights goes into the daylight mode, which means there are no tail light and no radio light, no internal light when opening the doors.The dimmer doesn't work nor do the remote door lock, after sitting for 2 to 3 hours with the ignition off everything seems fine,but after a few minutes it does the same thing at start up.But i can get the head lights, tail lights, and all the interior lights to work with the manual switch.

 

Do light work manually using switch?

 

Yes,the lights will work using the manual switch.