Headlights Won't Turn Off! - Hyundai Forums : Hyundai Forum
 
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#1 Old 02-09-2010, 11:41 AM
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Right, I've pulled out my HID's and put the GE Nighthawk bulbs back in. For whatever reason the headlights refuse to turn off. The only way to get them to turn off is to pull the 2 fuses in the engine bay fuse box. I've checked the relay in the passenger compartment as well, and just to be safe replaced it anyway. Even with the fuse in the passenger compartment fusebox pulled they stay lit. With the relay pulled... THE BLOODY THINGS STAY LIT!

Has this happened to anyone before?

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#2 Old 02-09-2010, 07:05 PM
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DSHornet
Maybe an issue with the DRL module?

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#3 Old 02-09-2010, 07:11 PM
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Did you disconnect the battery cable when you installed your HIDs? How about when you pulled them out? I suspect burnt BCM.

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#4 Old 02-10-2010, 10:58 AM
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QUOTE (DSHornet @ Feb 9 2010, 07:05 PM)
Quote:
Maybe an issue with the DRL module?
Shouldn't be the DRL as I unplugged it. Both terminals were removed during the install, and what in hades is a BCM.

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#5 Old 02-10-2010, 01:08 PM
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The BCM is the body control module. It's a computer which controls all the body electronics. It's real common for people to start installing things like radios, or in your case HIDs, and forget to disconnect the power to the car whilst doing so. One little short is all it takes to fry the bcm and do weird things like that, you probably wouldn't even know it shorted.

Another possibility is the bcm doesn't know how to react to the increased power drain from the HIDs and is doing weird things. The bcm may simply need to be reset since you disconnected the HIDs already. You reset the bcm by removing the battery cable for a minute or two.

I refrain from all these kinds of mods in modern cars for these reasons. You have no idea the complexity of what you are doing (and neither do I).

My suggestion is for you to pull off the negative battery cable, disconnect your HID system, replace the bulbs with the original ones and see if that helps.

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#6 Old 02-12-2010, 03:37 PM
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QUOTE (jsinton @ Feb 10 2010, 01:08 PM)
Quote:
The BCM is the body control module. It's a computer which controls all the body electronics. It's real common for people to start installing things like radios, or in your case HIDs, and forget to disconnect the power to the car whilst doing so. One little short is all it takes to fry the bcm and do weird things like that, you probably wouldn't even know it shorted.

Another possibility is the bcm doesn't know how to react to the increased power drain from the HIDs and is doing weird things. The bcm may simply need to be reset since you disconnected the HIDs already. You reset the bcm by removing the battery cable for a minute or two.

I refrain from all these kinds of mods in modern cars for these reasons. You have no idea the complexity of what you are doing (and neither do I).

My suggestion is for you to pull off the negative battery cable, disconnect your HID system, replace the bulbs with the original ones and see if that helps.
First there is no BCM in the 2004 Hyundai Santa Fe. There is an ETAC on the reverse side of the passenger compartment fusebox, in which the Headlight Relay is housed. Believe me when I say I do my research when performing my mods. You don't win the President's Choice award for Best Engineering by doing things half-assed.

As I said in the first post, I have already replaced the stock bulbs (which are the GE nighthawks I had in there originally. The HID's were connected directly to the battery for the power source and only used the stock headlight wiring to trigger a relay to turn them on (standard plug and play HID conversion Kit), so there is no extra voltage for anything to sense. I'm in the process of tracing the circuits to find where it is getting power from.

My suggestion is reading the original post prior to giving a suggestion.

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#7 Old 02-12-2010, 03:50 PM
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Ok, I looked up the system on hmaservice.com. They show an automatic light control system. If memory serves me, someone else had this problem, and was able to control it better by switching from "auto" mode to manual (if that makes any sense). The consensus was there was a problem with the light sensor located on the dash.
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#8 Old 02-13-2010, 11:25 AM
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QUOTE (jsinton @ Feb 12 2010, 03:50 PM)
Quote:
Ok, I looked up the system on hmaservice.com. They show an automatic light control system. If memory serves me, someone else had this problem, and was able to control it better by switching from "auto" mode to manual (if that makes any sense). The consensus was there was a problem with the light sensor located on the dash.
Unfortunately the Auto lighting system was only offered on the LX in Canada, and not as a standard option. I have a GLS, so that's not a possibility.

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