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Old 04-14-2006, 04:03 PM   #1
Doc_Floyd
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Default Fog lights & high-beam headlights

Because Texas is a jurisdiction which would not prohibit running fog lights and high beam headlights simultaneously, can anyone advise procedures for modification of the fog light relay to permit such?

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Old 04-14-2006, 09:35 PM   #2
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Default Re: Fog lights & high-beam headlights

If it's prohibited, why would you want to allow it? Did you buy a vehcile in TX and no longer live there? I'm in Texas, as well, so I'm curious.

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Old 04-14-2006, 11:37 PM   #3
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Default Re: Fog lights & high-beam headlights

It's not prohibited in Texas. (At least that is what he said) I'm thinking on it now. In OEM trim, the Foglights are controlled and monitored by the BCM (Body Control Module) So this may not be as easy as it might seem. I do not have the wiring diagram available to me at the moment, so I am hessitating trying to just say someting like "Connect wire A to wire B" for fear of frying the $$$ BCM in the process. I'll try to get back to you in the next few days.

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Old 04-15-2006, 01:49 AM   #4
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Default Re: Fog lights & high-beam headlights

wolfman, what about rewiring the fog lights directly to bypass the bcm's control, like you wrote up once previously? I'm interested in finding a way to get the low beams to stay on with the high beams, if you can figure that one out while you ponder Doc_Floyd's request. I was thinking that with the fogs i'd best just re-wire it around the bcm like you did for yours, but if you have another idea, i'm interested to hear it also.

I'm hoping to eventually have it where I can have my fog lights, high beams, and low beams on at the same time. I'm also wanting to make the corner lights blink with my turn signals. I think I need a bigger battery.

Edit to add: sorry to hijack the thread doc!!!

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Old 04-15-2006, 02:25 AM   #5
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Default Re: Fog lights & high-beam headlights

Quote:
Originally Posted by fotovue
wolfman, what about rewiring the fog lights directly to bypass the bcm's control, like you wrote up once previously? I'm interested in finding a way to get the low beams to stay on with the high beams, if you can figure that one out while you ponder Doc_Floyd's request. I was thinking that with the fogs i'd best just re-wire it around the bcm like you did for yours, but if you have another idea, i'm interested to hear it also.

I'm hoping to eventually have it where I can have my fog lights, high beams, and low beams on at the same time. I'm also wanting to make the corner lights blink with my turn signals. I think I need a bigger battery.

Edit to add: sorry to hijack the thread doc!!!
My 05 has traction control, so no OEM foglights (uses the place for the Foglight Switch for the traction control switch) The OEM foglights on my Vue were purchased on EBay and wired in with an aftermarket switch and two relays (so that they function as the OEM ones do) I am not sure if the BCM checks the Foglight circuit for a return (flow-through voltage) from the Foglights even when they are off to "look" for a malfunction or not. This is what I need to check. If the fogs are disconnected from the OEM harness and wired independant of the BCM (like mine are) it may cause the BCM to set a wrench light code as the return signal will vanish when the harness plugs are undone. Likewise feeding voltage back through the OEM harness by wiring the fogs to stay on with the high beams may send the wrong polarity voltage back through the BCM circuit and possibly damage the BCM.

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Old 04-15-2006, 10:51 AM   #6
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Default Re: Fog lights & high-beam headlights

Thanks, then disregard. I read elsewhere that the BCM does monitor this circuit and it is not as simple as many previous vehicles to modify. But it was worth an inquiry.

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Old 04-15-2006, 07:23 PM   #7
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Default Re: Fog lights & high-beam headlights

My Hellas are wired this way. I would imagine that the easiest way would be to wire it as if they were aftermarket. A side note the highbeams drop the voltage to one side of the light to turn them on. Otherwise they have equal power to both sides when they are off. Made wiring them fun!!!

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Old 04-15-2006, 08:37 PM   #8
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Default Re: Fog lights & high-beam headlights

Couldnt he just use a relay that is turned on by the high beams to turn the fogs on. The only thing the bcm monitors is the control side of the relay for the fog lights. By using a second relay in a second circuit nothing would be back fed to the bcm since its not physically on the same circuit. The back feed would only goto the switch side of the relay which will be open anyways not allowing any current back any further.
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Old 04-15-2006, 10:16 PM   #9
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Default Re: Fog lights & high-beam headlights

The logic of what you suggest makes sense, but it may be the easier in the saying than in the doing. It sounds like (a) I need a conventional relay, (b) to find the power feed for the high beams, (c) tap into it and connect to pole 85 on the relay, (d) ground the relay to 86, (e) fuse connect 30 to the battery or to the 30 connector on the original relay, (f) connect 87 to the fog lights or to 87 on the original relay.

Is that close? Wolfman what do you think?

flj

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Old 04-15-2006, 10:55 PM   #10
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Default Re: Fog lights & high-beam headlights

That is correct. I dont have the schematic in front of me though so it is all being said based on memory.
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