Question about 1998 GMC Sierra

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Why won't my headlights shut off during the day time? GMC Sierra 2000 4x4, 4.8L I checked the fuse on the Daytime running lights incase it was a fail-safe but it was fine. the lights stay on all day as if the truck thinks it's dark out. (It has the automatic lights)

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Press the e-brake in one click. Then check the lights. They should be off.

Posted on Jun 13, 2010

  • Danman85201 Jun 13, 2010

    Press the e-brake in one click. This will shut off the DRLs but will not put any pressure on the brakes. You will however get that brakes message on your dash when doing this.

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You have your headlight control set to auto and your light sensor on the top of the dash is either faulty or fallen out of it's bracket and can not sense light.. turn your headlight control to off and use your headlight switch in manual till you get your sensor problem fixed..

Posted on Jun 07, 2010

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1 Answer

Gmc truck sierra 2003 do you have headlights on auto during daylight


Yes the headlight are left on auto all the time. Don't forget you have daytime running lights (DLR) which are a function of the headlights but not a s bright. So the headlights would appear to be on during the day, but it is the DRL system that is doing that.

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You might want to start by checking the fuses associated with your headlights. If those are fine, check the headlight relay. You can do a search online to see where the relay is located on your vehicle.

Jan 26, 2014 | Cars & Trucks

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I cant turn off the headlights off while my 03 GMC Sierra Z71 is running, the manual switch does nothing unless the truck is turned off.


I have a 2003 GMC Sierra Z71 Extended Cab and the headlight switch won't turn off the headlights while the truck is running. When I got the truck the Photocell Sensor which is the black bubble that sits on the dash that tells the daytime running lights to turn off and on was down in the dash so I fished it out with my fingers and clipped it back in and it made the daytime running lights work. I still can't turn my headlights off while my truck is running though. The owner's manual says that I am able to do so. There's 2 light's on the switch by AUTO and the O for off that should light up? Is it my whole switch?

Oct 19, 2012 | Cars & Trucks

1 Answer

I have a 1999 gmc sierra and my lights stay on all the time on day time running lights


This vehicle may have a daytime running lamp control module, probably needs replaced. May be able to pull fuse under hood in fusebox for a cheap fix. Its labeled DRL in lid of fuse panel.

Jun 23, 2010 | 1999 GMC Sierra

2 Answers

At daytime start-up, the headlights come on instead of the DRLs.


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Apr 17, 2010 | 1999 GMC Sierra

2 Answers

Headlights only-no running lights-disarming the alarm system all lights work-at night no park lights or running lights-headlights only


These trucks have day time running lights. It sounds like the light switch is not turned all the way to the headlight position or the switch has failed and the day time lighting has taken over. If the switch is in the full on position then you may want to have the switch checked and possibly replaced. Hope this helps. Good luck.

Dec 02, 2009 | 1995 GMC Sierra C1500

1 Answer

Day time running lamps


The day time running lamps are your headlights, the parking lights also conventionally known as the running lights serve no purpose during daylight hours and as such are not necessary in the daytime, and are not illuminated by the DRL module. The DRL (Daytime Running Lights) module illuminates the headlamps in a slightly dimmer state than night time dim headlamps, but does not turn on the conventional running lights. The only way you'll get conventional running lights during the day is to turn them on manually. I just reviewed the wiring schematics for that system, and the DRL relay bypasses the dimmer switch when active and prevents high beam operation, and feeds current directly to the low beam headlights, there is no connection to the parking light circuit from the DRL module wiring.

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