Normal DRL function?

[Milano_II]

Hi guys!

I've a 2013 Yukon XL SLT. What is the normal DRL function? Is it supposed to be the amber bulbs (turn signals) or is it the headlights at a lesser brightness? I swear I've seen it sometimes just sitting with the amber bulbs on while running... Yet, my headlights seem to be on all the time now. I've seen a few posts about modifying the DRLs and deleting the DRLs but I haven't figured out what exactly the DRLs are supposed to be... I suppose I could pull the DRL fuses and figure it out but I don't have the car here right now.

Thanks!

- I would prefer just the amber's as DRL if I could set it up that way!

 

[mikez71]

The DRLs should be on whenever the solar sensor thinks its daytime.

Bulbs could be burned out, usually white?

 

[blondie70]

I pulled the fuse when I first got my truck...so never saw what they looked like..

 

[Doubeleive]

drl's come on while the vehicle is in drive, no parking brake set and not while in reverse. until dusk then auto headlights come on
if you press fog light button during the day then the running light also come on and remain on unless you flip the headlight switch to off or until you cycle the key
on the yukons drl's are also the low beam at a lower voltage. when the sun sensor detects it is dark enough it triggers the headlight relay to full low beam voltage.
you can turn off the drl's at each key cycle by flipping the headlight switch to off, if you remove the spring from the switch then you have full manual control.

 

[Milano_II]

drl's come on while the vehicle is in drive, no parking brake set and not while in reverse. until dusk then auto headlights come on
if you press fog light button during the day then the running light also come on and remain on unless you flip the headlight switch to off or until you cycle the key
on the yukons drl's are also the low beam at a lower voltage. when the sun sensor detects it is dark enough it triggers the headlight relay to full low beam voltage.
you can turn off the drl's at each key cycle by flipping the headlight switch to off, if you remove the spring from the switch then you have full manual control.

Thank you! I believe what tripped me up was looking at the parking lights after using remote start!

Since you mentioned fog lights and all, it made me think of another question --

My dome/map lights in the front. They only work on door open or forced dome function - I can't use them separately without all the other lights on? I can toggle them so they don't come on with all the other lights... Kinda weird operation. Is this correct?

 

[Doubeleive]

Thank you! I believe what tripped me up was looking at the parking lights after using remote start!

Since you mentioned fog lights and all, it made me think of another question --

My dome/map lights in the front. They only work on door open or forced dome function - I can't use them separately without all the other lights on? I can toggle them so they don't come on with all the other lights... Kinda weird operation. Is this correct?

nope they should turn on anytime you press the button, no key in the ignition or anything
they should turn anytime you open the door unless disabeled
and if you turn them on and lock the vehicle and walk away accidently leaving them on they should stay on for 10-15 minutes, they might even stay on period until the battery dies (not entirely sure). on my gmt800 it would trigger my 3rd party alarm if my kids left a rear one on because after 15 minutes they would automaticilly shut off and cause a voltage spike triggering the alarm
sounds like maybe the wiring is bad on the console or something or maybe a previous owner rewired them to only have accessory power.
used replacements run about $30-50 on ebay for the whole console, just have to be sure to get the correct color or p/n which is on a label on the backside of the console

 

[mikez71]

Are you saying your dome light buttons don't work?

 

[Doubeleive]

Are you saying your dome light buttons don't work?

I think he has another post and said they only work when the lights are on, which makes me think either they have been re-wired somehow or simply defective.

 

[adventurenali92]

@Doubeleive

Are the GMT900s setup differently than the 800s in regards to how to DRLs function? The DRLs on my 2006 come on during the day anytime the truck is taken out of park, they’re active in all gears, even sitting in neutral with the parking brake engaged they’re still on during daylight.

 

[Milano_II]

I think he has another post and said they only work when the lights are on, which makes me think either they have been re-wired somehow or simply defective.

Yes. It's definitely odd. If I push the buttons, that'll only make it so they don't turn on with the rest of the doors. They don't turn on independently. Not that I really need them much, but it was weird so I thought I would ask. I suppose it warrants more investigation !

 

[Doubeleive]

Yes. It's definitely odd. If I push the buttons, that'll only make it so they don't turn on with the rest of the doors. They don't turn on independently. Not that I really need them much, but it was weird so I thought I would ask. I suppose it warrants more investigation !

yes, the only other thing that might be possible is if they were changed to LED sometimes the led bulbs (depending on the brand) do not like lower voltage so they either will not light up or will only be very dim

 

[Milano_II]

I think he has another post and said they only work when the lights are on, which makes me think either they have been re-wired somehow or simply defective.

Yes. It's definitely odd. If I push the buttons, that'll only make it so they don't turn on with the rest of the doors. They don't turn on independently. Not that I really need them much, but it was weird so I thought I would ask. I suppose it warrants more investigation

yes, the only other thing that might be possible is if they were changed to LED sometimes the led bulbs (depending on the brand) do not like lower voltage so they either will not light up or will only be very dim

They had been, by the previous owner.. And they were blindingly bright so I changed them back to incandescent... But the function was the same either way ‍

 

[Fless]

@Doubeleive

Are the GMT900s setup differently than the 800s in regards to how to DRLs function? The DRLs on my 2006 come on during the day anytime the truck is taken out of park, they’re active in all gears, even sitting in neutral with the parking brake engaged they’re still on during daylight.

I concur with this for the GMT800s. My DRLs are on no matter the parking brake position, out of Park of course.

I replaced my DRL white LEDs today with amber LEDs. I think the non-daylight color is easier to see.