Jump to content

Automatic Headlight Function

Rog Man

By Rog Man
in Ask A GM Technician

Recommended Posts

Rog Man Enthusiast

Rog Man

Posted
Posted

I have a Canadian 2006 GMC 2500HD 6 litre gas 4x4 automatic.

My headlight switch does not have an off position. It stops at the stupid auto function and I hate it.

Is there an easy way to kill/disable the automatic headlight function without affecting the operation of the DRL's

Any help would be greatly appreciated?

Rog Man Enthusiast

Rog Man

Posted
  • Author
Posted

Looks like i am outah luck having a Canadian truck, Although i do not want to disable the DRL's just the auto headlights.

I disagree with the statement made there that is illegal to disable auto headlights in Canada as not all vehicles even have that feature?

I guess I will have too dig deeper and see about killing the auto headlights without affecting the DRL's?

Thanx for the link though.

cheers

Rog Man Enthusiast

Rog Man

Posted
  • Author
Posted

What I need to know is how do I fool the stupid little sensor on the dash into thinking it is ALWAYS bright and sunny outside?

That would achieve the end result that I desire?

superjim Senior Enthusiast

superjim

Posted
Posted
What I need to know is how do I fool the stupid little sensor on the dash into thinking it is ALWAYS bright and sunny outside?

That would achieve the end result that I desire?

 

 

Just off the top of my head...

I know that the sensor is a photocell, thus it sends varying voltages to the headlight relay depending on light conditions and turning on and off the auto headlights as needed.

 

You would need to find out the voltage it sends for bright sunlight and then tie into a voltage source with the correct voltage, maybe even disconnecting the sensor.

 

Then the relay would always think it was bright and sunny and never turn on the auto headlights.

Rog Man Enthusiast

Rog Man

Posted
  • Author
Posted

I tried covering and disconnecting it, it thinks it is night time then.

I have too find out like you said what it does on a bright sunny day and then duplicate it.

superjim Senior Enthusiast

superjim

Posted
Posted
I tried covering and disconnecting it, it thinks it is night time then.

I have too find out like you said what it does on a bright sunny day and then duplicate it.

 

 

You are right.

Covering it...it thinks it is night and turns on the lights.

Disconnecting it...it defaults to FAIL SAFE MODE and turns on the lights. :)

 

The only thing I can think of, is to find the wires coming from the sensor...measure the voltage it is sending to the relay during bright sunlight...disconnect the sensor and duplicate THAT VOLTAGE going to the relay.

That would keep the relay in the OFF mode.

 

Then when you disconnect the sensor, the lights will never come on unless you turn them on.

superjim Senior Enthusiast

superjim

Posted
Posted
Wasn't there a thread about wiring in a resistor to do just this?

 

 

hmmm...I don't know...looks like it is time I used search to try to help him.

I never even THOUGHT about that. :D:D

Archived

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

Go to topic listing

  • Recently Browsing   0 members

    • No registered users viewing this page.

  • Forum Statistics

    250.4k
    Total Topics
    2.7m
    Total Posts

  • Member Statistics

    342,837
    Total Members
    8,960
    Most Online
    bellssn690
    Newest Member
    bellssn690
    Joined

  • Who's Online   2 Members, 0 Anonymous, 664 Guests (See full list)

  • Latest Articles

  • Posts

    • Chuck FB
      2 speed transfer case optional now?

      By Chuck FB · Posted

      Yes, and also pulling heavy trailers or a large camper up steep grades as well as descending grades such as the more rustic off road camping locations and using engine braking with that low gearing as well as soft ground can just suck the power . I realize pickups these days tend to have an over all lower first gear ratio compared to automatic transmission pickups from years back so that has helped a lot in its ability in high range but there comes a point if in four wheel drive the torque runs out at the wheels, certainly with a gas engine. They don't put two speed transfer cases on pickups for a cool factor, they have a function if one needs that massive torque to the wheels that high range can't deliver. 
    • Grumpy Bear
      Grumpy Bears 2015 Silverado 2WD

      By Grumpy Bear · Posted

      Notes 7/18/2026   3,400 miles on this batch of Mobil 1 Euro 5W40 since the GDI pump replacement. Alcohol runs very clean when ring seal is tight and the sump isn't getting hosed with fuel. Checked oil level at fill up today as is my practice and grabbed a white Kleenex to look at the color. What color?  I was going to change it but.....  
    • Another JR
      2 speed transfer case optional now?

      By Another JR · Posted

      4 low is really nice on steep boat ramps. 
    • Chuck FB
      Gas Prices

      By Chuck FB · Posted

      Interesting, I suspect I would have fueled up in Lee Vining as the day prior I would have filled up either in Laughlin or near there and maybe again before I entered Death Valley and once out the other side late that evening as I kept on driving into the night up near Lee Vining. Next morning I most likely fueled up in LV before heading over Tioga Pass into ( as I refer to it as "Yose .... Mite" 😁 ). And again that was 19 years ago but the price then must not have jumped out at me like the 5 bill a gallon theme of nutty cult hippy country Big Sir or head so far up their rear Aspen. I'd be curious to know where the highest prices are in the lower 48, I probably would not be far off to guess somewhere in Cali forn ie. Coldfoot and Prudhoe bay may have those prices beat but that is a whole other world up there and when prices are more normal elsewhere that is about what they can be up there I believe in no mans land. Anyway interesting that the 395 corridor is hosing people and the thing is, its tourist season and its not like there are a lot of competition options when driving up that highway from what I could see. Yup, big ole Boaterhomes and various other RV's ahead and behind me at the Yosemite entrance gate and they have to get their fuel somewhere.  
    • Atlas
      Gas Prices

      By Atlas · Posted

      Those can be high, as well as the big California cities. The ones that will pop your eyes out are the 395 corridor on the Eastern side of the Sierra Nevadas. Lee Vining, $7.19 for regular and $8.89 for diesel is what the Google said right now.

  • GM-Trucks.com Clubs

  • Popular Contributors

×
×
  • Create New...