Look under the dash, right under the steering wheel, see the pic attached or above. Stupid Daytime Running Lights, the most dumbest thing ever invented by Government Burearcrats ever. If this module has been removed, you will have the green light illuminated on the dash during the day with with the lights off. It is telling you that your DRL's are not on. If the module has been removed it is not usually a problem on the 99's. But some have reported that it can interfere with other circuts. Do more research.
Oh Hell, I can't even remember anymore...that's how stupid and unsafe they are. I have removed these modules from 2 of my 99 tahoe's and a '98 Yukon without any issues.
Previous owner could have pulled the fuse, but most fuses are tied into 2 or more circuts so something else would not work as well (a way to track down faults). They are actually unsafe because you could be driving with the DRL's on and not turn on your actual headlights when it gets dark out (and hence, no tail-lights or side markers). Whatever, if another driver can't see a big old Tahoe coming down the road at them at 70 mph...well, you get the idea. If you don't have the module pictured above, then you may have the circut board type, housed in a green plastic box in the same location. 99's were on the cusp of using both types.
Yes, there are soldered resistors that can be removed or added if you have the circut board type. (keep doing a search on this site). OR you can put a piece of black tape over the "green" light and ignore it. OR, you can use it to your advantage like many of us here.
Real drivers, like Commercial Truck Drivers, always cut off their headlights and leave ON their parking lights when parked, or stopped and even manuvering at very slow speeds to park. This is a courtesy to other truckers, and even "car drivers". It also reduces the amps drawn by the alternator when the headlights are not needed, but the marker lamps should be illuminated for safety reasons. Truckers, due to their size, always try not to blind other truckers that are backing up or trying to park out of courtesy and safety, most of us car drivers have no idea what they must go through, and all it takes is a few idiots with their headlights on in their mirror's to totally screw them up and blind them (they have HUGE mirrors).
So many of us "real drivers" that have "deleted" our DRL's, will use the green lamp to let us know, at night, that the parking lights are ON, but that the headlights are OFF. (the green lamp goes off when you turn on the full headlights). During the day, the green light on the dash is a very small annoyance, in exchange for a reminder to turn on the headlights after using just the parking lights, especially after leaving a shopping center etc. when there are a lot of city lights illuminating the area. Hard to explain, stupid Government B.S. Ever seen cars driving down the freeway or highway at night with no tail-lights...thats becasue their DRL's are on and they think that their headlights on!! Real freaking safe Government idiots! Or maybe it's just the idiot driver that doesn't notice that none of his gauge lights are on, and his tail-lights are not on, his side-markers are not on, but "damn, my headlights seem kinda dim honey"...maybe I need a new battery,
Freaking morons!
