Auto Headlight Problem!
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Auto Headlight Problem!
I tested the sensor with a flashlight. The lights come on and off, fog lights, and parking lights but no head lights. any help would be appriciated. also everything works fine doing it manually 
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Joined: Sep 2005
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From: Wichita KS
Got me there. I'm at work with nothing going on and been looking at the wire diagrams on alldatadiy.com for a good hour now and can't understand this problem. What model year is your truck?
Only guess I have is maybe your headlight switch is messed up but that's a long shot.
Only guess I have is maybe your headlight switch is messed up but that's a long shot.
Last edited by Impact9; Oct 28, 2009 at 03:15 AM.
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From: Wichita KS
From what I was looking at the switch is hard wired to let everything turn on when the sensor is active. The sensor is basically a simple switch that lets power flow to the lights through the headlight switch.
You might suspect the body control module but from what I can tell you would have no light if it malfunctioned.
Maybe someone with a actual factory manual can clue us in if something is missing from these diagrams:
You might suspect the body control module but from what I can tell you would have no light if it malfunctioned.
Maybe someone with a actual factory manual can clue us in if something is missing from these diagrams:
Last edited by Impact9; Oct 31, 2009 at 03:59 AM.
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From: DFW, TX
Have the same problem with mine. I took it in to Ford right before my extended warranty expired and they told me it was something like the security module part of the body control module and not covered. I told them for the $400 it was going to cost to fix, I can turn the **** old-school style to get the headlights to come on.
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Well i went up north and flashed my used my highbeams a couple times, came home and now they work again. Its stranged, they work fine once in a while they wont but they work most of the time now i give up lol!
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I have had the same problem with my 05 Ford F150 Supercrew and been cruising the forums. I figured the problem why my Parking lights worked but my headlights did not work on auto only if I turned on the switch.
After replacing the factory switch isolated the problem to the Body Control Module (BCM) behind the rear seat on the driver side.
The hardest part of the repair was getting the rear seat out, but here is some help from another member http://i222.photobucket.com/albums/dd14 ... 1232255578
When I unplugged the module I noticed the corner pin on the Blue plug looked like it was hot and the plug was melted and the pin was burnt black. I took the module out and opened and ran a 16 gauge wire to the inside of the burnt pin and soldered it on contact. I then drilled a small hole to run the wire through. I cut the red/yellow stripe wire from the coresponding pin on the outside plug and butt spliced the two wires together taking the bad pin and socket out of the equasion. In my opinion too much current on a small contact.
Good news is my auto headlights are working again after being out for over a year. The problem was not the BCM but a bad connection going to the BCM.
Tools needed so you have everything
small screwdriver to remove middle seat belt cover shoulder plate
10mm socket to remove two nuts
T50 Torx to remove shoulder belt
Medium size straight edge screwdriver to push in seat clips to remove rear seat, this job is tough but the latches are above the child seat tethers on the bar that holds in the seat. They are almost even with the outside tethers, but a few inches above. Check out diagram above for help.
you will need a 8mm to take the two bolts holding the BCM in.
two small screwdrivers to pull the board out of the BCM case.
Sorry I did not take pictures, but I know how frustrating it is to have things not work on your car and I hope this helps.
First time post so sorry if I dug up and old thread
I did the whole job in less than an hour, but i had all the tools and solder equipment.
After replacing the factory switch isolated the problem to the Body Control Module (BCM) behind the rear seat on the driver side.
The hardest part of the repair was getting the rear seat out, but here is some help from another member http://i222.photobucket.com/albums/dd14 ... 1232255578
When I unplugged the module I noticed the corner pin on the Blue plug looked like it was hot and the plug was melted and the pin was burnt black. I took the module out and opened and ran a 16 gauge wire to the inside of the burnt pin and soldered it on contact. I then drilled a small hole to run the wire through. I cut the red/yellow stripe wire from the coresponding pin on the outside plug and butt spliced the two wires together taking the bad pin and socket out of the equasion. In my opinion too much current on a small contact.
Good news is my auto headlights are working again after being out for over a year. The problem was not the BCM but a bad connection going to the BCM.
Tools needed so you have everything
small screwdriver to remove middle seat belt cover shoulder plate
10mm socket to remove two nuts
T50 Torx to remove shoulder belt
Medium size straight edge screwdriver to push in seat clips to remove rear seat, this job is tough but the latches are above the child seat tethers on the bar that holds in the seat. They are almost even with the outside tethers, but a few inches above. Check out diagram above for help.
you will need a 8mm to take the two bolts holding the BCM in.
two small screwdrivers to pull the board out of the BCM case.
Sorry I did not take pictures, but I know how frustrating it is to have things not work on your car and I hope this helps.
First time post so sorry if I dug up and old thread
I did the whole job in less than an hour, but i had all the tools and solder equipment.