Anyone successfully add auto headlights?
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Senior User
Joined: Feb 2016
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From: Winchester, VA
Anyone successfully add auto headlights?
My 2004 Excursion XLT came without auto headlights. I had them on the last truck and wanted them on the Ex. So, I got the correct switch and the light sensor for the dash. I plugged both in, but no joy when I turn the switch to the auto position (yes, it was dark out. 
). Do I need to take it to the dealer and have the computer programmed to recognize that I have auto headlights? Or is there some relay or fuse that I'm lacking? Thanks.
). Do I need to take it to the dealer and have the computer programmed to recognize that I have auto headlights? Or is there some relay or fuse that I'm lacking? Thanks.
Elder User
Joined: May 2015
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From: NYC
I know people have added daytime running lamps, that's easier to do, it's just a relay or something. I don't think it's possible to add auto headlights though without swapping in a new VSM from a limited trim. When my VSM wasn't working my auto headlights and a few other features were out as well. And if you look at a wiring diagram you'll see that one wire from the subload sensor goes to the instrument cluster and another to the VSM.
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Joined: Nov 2012
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They have 12v photocell sensors on amazon for about $10. You could get a switch and relay and do a separate circuit that turns on the parking and headlights. Just wire it to the accessory wire and it will also automatically turn the lights off while cranking.
Sounds a little complicated but it's actually pretty simple. Just be smart about where you put the light sensor so it doesn't cut the lights off at every street light or car it passes.
Sounds a little complicated but it's actually pretty simple. Just be smart about where you put the light sensor so it doesn't cut the lights off at every street light or car it passes.
Thread Starter
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Senior User
Joined: Feb 2016
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From: Winchester, VA
VSM
I know people have added daytime running lamps, that's easier to do, it's just a relay or something. I don't think it's possible to add auto headlights though without swapping in a new VSM from a limited trim. When my VSM wasn't working my auto headlights and a few other features were out as well. And if you look at a wiring diagram you'll see that one wire from the subload sensor goes to the instrument cluster and another to the VSM.
New User
Joined: Oct 2015
Posts: 22
Likes: 3
From: N.E Ohio
I went with the DEI 545t unit for auto headlights and park lights.
It is also integrated with the wipers to activate the headlights when the wipers are turned on.
Sorry, I do not have any input as to activating the factory parts for this option.
It is also integrated with the wipers to activate the headlights when the wipers are turned on.
Sorry, I do not have any input as to activating the factory parts for this option.
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Elder User
Joined: May 2015
Posts: 752
Likes: 9
From: NYC
I did look at the diagram before I added the sensor and switch and it appeared there was a wire going to the VSM for that circuit. I just didn't know if there was a separate fuse/relay that I didn't have or if I would have to take it to the dealership and see if they would have to program it (or if all VSMs were programmed for it from the factory). I was hoping to avoid the taking it in, since dealerships charge an arm and a leg for most things these days.
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