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removed DRL fuse but DRLs still run?

removed DRL fuse but DRLs still run?

Postby JBartoletti [OP] » Jan 10 2012, 5:16pm

I removed the DRL fuses (apparently there are 2 of them? Fuse 31 and 33 IIRC. 08 Sierra...) last night and this morning on my way in to work, the DRLs were still running. It was plenty bright out enough for the auto lights to not have activated (in my opinion, anyways...was about 8:30-8:45). Why are these still running?? Even with pulled fuses?
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Re: removed DRL fuse but DRLs still run?

Postby Dirtsc00tin185 » Jan 10 2012, 7:48pm

i took my drl fuses out also and im still having the same issue. i think what it does its turns off the corner light and keeps them from being on all the time. i still find my headlights being on at 8 in the morning, but in the middle of the day (around 12-1) when the headlights are off, the corner lights are no longer on. thats what im thinking the fuse controls
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Re: removed DRL fuse but DRLs still run?

Postby IndegoBlue » Jan 10 2012, 8:12pm

Im not sure about the DRLs, but i know the running lights have a 3 fuse locations. One under the steering column, one on the driver side of the dash, and one under the hood. When i added marker lights i wanted to tie into the switch and the only one that actually shut them off was the one on the side of the dash. Both the one under the hood and below the steering column did nothing when i unpluged it (nothing noticeable) it didnt shut them off. I'd check the manual for other DRL fuse locations. If you dont have the manual anymore you can go here Owner's Manuals the forum is awesome and has a ton of manuals to choose from.
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Re: removed DRL fuse but DRLs still run?

Postby IndegoBlue » Jan 10 2012, 8:36pm

So i did some research (no work today) and you have some options here.

(Note these are not mine and i am not responsible for the path you choose)

Heres the first one:
"1. Disconnected the pink wire with the white stripe from BCM connector C1-A5 [BCM output to Headlamp Driver Module (HDM) - Looks like a relay, but is a solid state relay type device. Find in owners manual.]

2. Splice a white wire into the white wire at BCM connector C2-F9 (BCM input from the headlight switch). Connect this new white wire to the pink wire with the white stripe removed in step 1. When your turn your headlights on with the switch, it will provide a signal to the BCM and to the HDM. The high beams will not work unless you keep this input to the BCM.

3. Cut the wire trace C3-A14 in the flat wire con1. Disconnected the pink wire with the white stripe from BCM connector C1-A5 [BCM output to Headlamp Driver Module (HDM) - Looks like a relay, but is a solid state relay type device. The HDM is relay 46 in the hood fuse block.] .

4. Disconnect the grey wire with the black stripe from terminal C2-E5. Connect this to the wire you just soldered to C3-A14.
This assumes you are familiar with basic troubleshooting and handyman skills and that you will properly insuate your splices, etc. Needless to say, this will void your warranty if it is still in effect."

or, Number Two:
http://www.lightsout.org/disable.html#GMspec 2008 isnt on there but im sure some of the clues can be found.

also Number Three:
If you can not find the module, there is a headlamp relay (5 pins) located in the engine compartment or near the steering column, and if you bend over one of the coil pins, #85 or #86, or the normally open contact #87, that will disable the DRL. (#30 and #87a are needed)


Im gonna keep looking, seems like there are multiple answers to this question, its got me interested now! i think i want to switch my running/marker lights to go on as if they were my drls, and disable my drls now
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Re: removed DRL fuse but DRLs still run?

Postby IndegoBlue » Jan 10 2012, 8:54pm

Image picture is from on a 2008 gms sierra

or switch the bulbs to amber bulbs, looks bad ass!
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Re: removed DRL fuse but DRLs still run?

Postby adams99z71 » Jan 10 2012, 9:15pm

not sure what setup you have but i would just take the bulbs out. takes 5minutes tops with my truck.
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Re: removed DRL fuse but DRLs still run?

Postby dustcloud » Jan 10 2012, 10:16pm

I don't think you can actually remove the bulbs because they are also the low beams.
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Re: removed DRL fuse but DRLs still run?

Postby JBartoletti [OP] » Jan 11 2012, 12:03am

dustcloud wrote:I don't think you can actually remove the bulbs because they are also the low beams.


This. I don't want my headlights on during the day (low beams). That's what I meant by DRLs. I wasn't referring to the front markers....
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Re: removed DRL fuse but DRLs still run?

Postby JBartoletti [OP] » Jan 11 2012, 12:05am

IndegoBlue wrote:Image picture is from on a 2008 gms sierra

or switch the bulbs to amber bulbs, looks bad ass!


I believe that's what I did...fuse 31 and 33 from the description in my owner's manual and the undersize of the plastic cover that covers the fuse block...
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Re: removed DRL fuse but DRLs still run?

Postby conway4363 » Mar 24 2012, 3:50am

ran into the same problem with my 08 silverado, i had the drl fuse 31 and 33 pulled and my lights still came on. i have the solutions to the problem. so first took the fuses out but my lights where still running during the day. for whatever reason the ambient light sensor on the dashboard was getting just enough overcast to turn the headlights on. because i have hids and the trucks as we all know, flash the headlights fast when the truck starts in the dark. this is awful for ballast life. so to solve that issue i unplugged the ambient light sensor from the wiring harness in the dash. now doing so makes your truck think that you are constantly in the dark and puts your headlights on 24/7. that however can be changed by buying a 1.19 pack of radio shack resistors and placing them in the white and black and black wire spots on the end of the harness under the dash. and in turn will make your truck think now its day light 24/7. now the only way to turn on my headlights is to manually take my switch and turn it to the right to on. no auto on, no drl ect. i have pictures of how i did this and can write up something in more detail if anyone's interested. so to summarize..........no drl , no auto on, headlights must manually be turned on, and no fast flash on start up. hope this helped!
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