Jump to content


This topic is now archived and is closed to further replies.


Headlights stay on all the time

Recommended Posts


I recently have a problem with my headlights staying on while driving during the day.

High/low beam switch still works.

In 'Access.' it's off and I can turn them on manually.

When on 'ign.' They turn on. And while driving.

I'm guessing maybe the little sensor on dash is bad or relay or a fuse?

Is there anything I can look for that could be bad?

The ambient light sensor has 2 wires that go to the BCM; a white wire and a gray wire.


I was thinking also about disabling the sensor and just using the headlight knob/switch. Is this a matter of shorting these 2 wires or separating them?


btw, where is the BCM (where the ambient sensor, etc.. plug into)?



Share this post

Link to post
Share on other sites


Please help ;)

I'd like to disable the ambient sensor all together...

I know the sensor has 2 wires.

Does connecting these 2 wires disable the sensor or separating them?...or do I have to add a resistor to them?



Share this post

Link to post
Share on other sites

Heres how to bypass the sensor courtesy of Golden Silverado

at fullsizechevy.com:

I have read several posts asking for information on how to disable the twilight (auto on) feature on the headlights of 99 FSCs.

I wanted to do this myself so I searched and found several methods of doing it.

This is the easiest. You don't have to take the dash apart or cut any wires. Just a simple in line resistor.

Here it goes:


To disable the auto headlights you need a 1.5K ohm resistor (Radio Shack) and 2 Scotchlok Tap Connectors (Walmart).


First locate the Body Control Module (BCM) which is under the dash, below the steering column. Laying on the floor, this should be visible without removing any dash panels. You should find a purple connector (C3). Unplug it.


Locate the white and gray wires (A4 and A6). I don't remember if white is A4 and gray is A6 or vice versa. It doesn't matter anyway. BTW - there are two gray wires in the connector. The one you want is the one farthest away from the white wire.


Tap the gray wire from the plug (C3) to one end of the resistor and the white wire to the other end. You don't need to cut the wires. Make sure you tape up all wires to prevent a short. You should now have a gray wire coming from C3 tapped to one lead of the resistor and the white wire from C3 tapped to the other resistor lead *. Plug C3 back into the BCM. Start the truck and make sure the lights are off. Throw a dark towel or something over the light sensor on the dash and verify the lights stay off. Try your light switch that has probably never been used and that's it! Takes about 5 minutes.


*You can add a switch here if you want. Just connect one end of the resistor to one of the wires in the connector (doesn't matter which one) and the other end of the resistor to one side of the switch. Then connect a wire from the other side of the switch to the other wire in the connector. This will allow you to turn Twilight Mode on and off.



Share this post

Link to post
Share on other sites


Important Information

By using this site, you agree to our Terms of Use.