Simple reroute DRLs to Foglights mod (for HID users) - Pontiac Solstice Forum

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Old 11-02-2012, 03:14 PM   #1 (permalink)
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Simple reroute DRLs to Foglights mod (for HID users)

Now that I have my HID projector headlights in place (per thread here), I don't want to have them on at full brightness all the time because of the DRLs (per the discussion here). Crappa has a solution that he came up with, but it involved extra external wiring and relays and I thought there MUST be an easier way, so I studied the schematics and came up with the following. It involves modifying two relays and keeps all the wiring inside the underhood fusebox. Plus, it's easily and quickly reversible by just replacing the modified relays.

NOTE: The method below causes the fog lights to be used as DRLs. It also (!) retains the ability to switch on the fogs, even if the DRLs aren't on.

First the caveat. I take NO RESPONSIBILITY for any damage resulting to your car when following these instructions and/or doing this modification. On your own head be it!

So what we're going to do here is simply break the output of the DRL relay and just cross-link it to the coil pin of the fog light relay, as shown in this modified schematic. Thus, no changes need to be made to the car's wiring harnesses:


OK, so a couple of ways to do this. In my case, I bought a pair of Omron relays from Digikey <this> for just $4 each plus $3 postage - or probably available at similar cost from your local parts store. I then took them apart and internally wired (later). However, a perfectly good option is to cut off the pin from your existing DRL relay and solder the cross-link wire to the correct pin of your fog light relay. This photo shows the two relays (inverted, obviously, since they are upside-down) with the green line showing how to solder the wire and which relay pin to cut off:



Here's how I rewired the Omron relays, should you buy them and want to do it this way. First unclip and pull off the relay shell/cases, then drill a small hole in the top corner of the shells to allow the wire to exit (see the picture to see which corners to drill!).

Then, for the DRL relay, cut the innards and solder the wire as shown (NOTE: this works for this Omron relay ONLY, other manufacturer's relays may be different internally, and certainly the ones in my car from the factory were NOT modifiable internally as the contacts/wiring are enclosed/hidden inside - in which case, you would need to use the external method above) [whew!]:



Now feed the wire through the two relay cases (don't forget to do this before soldering!!), then solder the fog light relay like this:




Finally, now you have your relays wired together, simply go to your car and open the fusebox (below). Unplug the foglight relay #54 and the DRL relay #48. Replace them with the modded ones. NOTE THE ORIENTATION -- any other connection could blow a fuse or even fry your BCM! To confirm, see the red-sharpie arrows on the relays, pointing to the big red Positive terminal on the fusebox.



Close up the fusebox and you're done! Reversing it is a simple matter of replacing the two relays with unmodified ones.

Hope this helps anybody who has HIDs and doesn't want them on all the time
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Old 11-04-2012, 03:50 PM   #2 (permalink)
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Aggh!

OK, I made a minor boo-boo with the first version of this mod, that I only realised today when I had my car out. The old method works it's just that it routes the DRL voltage to the fogs, which meant the fogs are only on half-bright! Given the d*mn things aren't that bright to begin with, I went back to the drawing board. Good news is the new version isn't much more difficult, but it does mean that you HAVE to modify both relays, but then it retains the fod light override function (ability to turn on the fogs even if DRLs are off).

Anyway, apologies. The initial post in this thread has now been modified to the new method. Thanks.
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Old 11-04-2012, 08:24 PM   #3 (permalink)
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Nice job, TS. Unfortunately, trying to blow up my BCM by way of my rearview mirror and solid state relay was enough electrical shenanigans for me, personally.

I do wish, though, that DURAMAX had figured out, based on a post from the Sky forum a while back, how to wire the DRLs into the upper corner parking lights. That, I might've considered.

Meanwhile, I just pulled my DRL relay and keep it in my cubby and turn on the fogs before leaving the parking garage during daylight hours.
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Old 11-05-2012, 07:32 AM   #4 (permalink)
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Nice job, TS. Unfortunately, trying to blow up my BCM by way of my rearview mirror and solid state relay was enough electrical shenanigans for me, personally.

I do wish, though, that DURAMAX had figured out, based on a post from the Sky forum a while back, how to wire the DRLs into the upper corner parking lights. That, I might've considered.

Meanwhile, I just pulled my DRL relay and keep it in my cubby and turn on the fogs before leaving the parking garage during daylight hours.
I'm no expert, but I've done enough 12V DC now that I'm pretty functional. And it all boils down to high school physics, and a multimeter. This isn't directed at you, but people that just connect wires because they saw a picture, or someone told them to are just CRAZY! How the hell would you not use a multimeter and confirm the wire is the wire you're looking for before you connect them?

Anyways, this is more a result of so some BS I've seen on other forums lately where people are just asking for trouble and causing all kinds of stupidity/damage.
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Old 11-05-2012, 07:46 AM   #5 (permalink)
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I'm no expert, but I've done enough 12V DC now that I'm pretty functional. And it all boils down to high school physics, and a multimeter. This isn't directed at you, but people that just connect wires because they saw a picture, or someone told them to are just CRAZY! How the hell would you not use a multimeter and confirm the wire is the wire you're looking for before you connect them?
I hear ya CS, and I agree. But even that doesn't save you all the time. For example, I did exactly that when setting this mod up. I saw 12V (engine off) wherever I expected to, when I expected to. I just forgot that there's some resistor in the DRL circuit that drops the voltage under higher current draw. Sigh.
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Old 11-05-2012, 08:02 AM   #6 (permalink)
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I hear ya CS, and I agree. But even that doesn't save you all the time. For example, I did exactly that when setting this mod up. I saw 12V (engine off) wherever I expected to, when I expected to. I just forgot that there's some resistor in the DRL circuit that drops the voltage under higher current draw. Sigh.
Totally stuff like that does happen from time to time. Like when I first read about the auto-headlight automatic override. I ended up getting results that I wasn't expecting as in the voltage on my sensor circuit seemed to be lower than those of the original thread's poster. Or when I once had to tap wires to find the reverse signal with a needle and a multimeter, and it was raining, and I thought I was covered up enough, but a few rain drops got through, onto my work area, and caused a little short. Thankfully, I didn't "blow" anything. But it sure shut down work immediately.

What I'm really talking about are people that get pictures or descriptions of instructions from the internet, and then just connect stuff. No attempt whatsoever at checking or comfirming you're getting what you're supposed to be seeing on a particular wire. If I had done the same, my headlight override would never work. Which is the kind of thing I've seen on other forums lately. People basically damaging their original wiring, and causing potential fire hazards. And more importantly, you have the requisite understanding of 12V DC to work your way out of the problem. Like I did. I had to figure out I need less resistance, you remembered the DRLs run on a lower voltage than when the headlights are on, and figured it out. I don't know how many threads I've read where someone has wired something, something's wrong now, and they are asking for help based on vague descriptions and obvious lack of understanding to effectively describe what has even happened let alone to be doing what they are doing safely.

Last edited by Carbon Sky; 11-05-2012 at 08:10 AM.
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Old 11-13-2012, 08:07 PM   #7 (permalink)
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Just a quick note. TS I love the simple change for the DRLs. Long story short with my Auto I found it HAD to be out of '"PARK" for the DRLs to work. Hope this may help someone else who may want to do the mod.
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Old 11-14-2012, 12:24 AM   #8 (permalink)
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I'm curious if this would work to use the amber front turn signal lights as DRL's as they were in the 06 models? Instead of using the relay for the fogs, use the relay for the turn signals and modify it in the same way.
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Old 11-14-2012, 08:08 AM   #9 (permalink)
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I'm curious if this would work to use the amber front turn signal lights as DRL's as they were in the 06 models? Instead of using the relay for the fogs, use the relay for the turn signals and modify it in the same way.
No, sorry. Turn signals are controlled directly by the BCM, not via a relay. So no way to cross-connect.
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Old 11-14-2012, 09:11 AM   #10 (permalink)
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Thank you, I read that in another post, but wasn't sure if there was a way around that. I just don't like the headlights being on as DRLs and prefer the amber turn signals. I may try this method with the fogs and see how it looks. Do you have any pictures with this mod completed? I know what the car looks like with the fogs turned on, but I'm assuming with this only the fogs are on and not the other lights.
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Old 11-14-2012, 10:47 AM   #11 (permalink)
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No, it operates just as if you'd turned the foglights on manually, so sidelights are on as well.
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Old 11-14-2012, 03:13 PM   #12 (permalink)
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Pretty darn nifty "TS", I just pulled the DRL fuse when I installed the HIDs and am contemplating rerouting the DRL to the two little lights in the upper outside corner in the Sky housing... you know those stupid little #194 lights that serve no real purpose.
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Old 11-15-2012, 03:18 PM   #13 (permalink)
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Do you have to have hids for this to work? What if I want my fogs for drl using stock lamps?

I would assume it can work, but you seem to go out of your way to say "if you have hids" a few times so I wonder if its really a condition?
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Old 11-15-2012, 04:20 PM   #14 (permalink)
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Nope, not a condition, more so a result. So to answer your question, it will work regardless of whether your headlights are halogen or HID.
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Old 11-15-2012, 05:27 PM   #15 (permalink)
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Yeah, as CS says, it works whatever lights you have. I just didn't see a real reason for it unless you have HIDs... but if you just prefer it that way, then go for it.
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