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Foglights On With High Beams

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john m. New Member

john m.

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No Did you orient the diode in the correct direction?

Yeah the diode was in the correct direction. My guess is during the day, in auto light control, you can not turn on the brights by pushing forward on the lever. Works perfectly at night time.

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Spurshot
Spurshot

2014 SIERRA SLT FOG LIGHTS WITH HIGH BEAM HEADLIGHTS MODIFICATION This mod will let you use the fog lights on low beam same as factory. On and off with the fog light button. When the fog ligh

Spurshot
Spurshot

This was on the Duramax forum. I believe it is for a GMT 900. But the principles are likely applicable to a K2. Use this information cautiously. ------------------------------------------------------

Spurshot
Spurshot

OK, After struggling thru the schematics and online mods of past models all evening, I figured it out. This is for a Sierra and should be the same for the Silverado. It involves pushing one Diode in

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EaZ8 Enthusiast

EaZ8

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Posted

Be careful about the terminology. There is a "Headlamp signal" and a Left and Right "... Headlamp Low Beam Supply Voltage". My guess is that the "Headlamp Signal" is from the switch on the dash, which I don't think will do what you want as it is likely a ground.

 

I think you want to tap the "... (L or R) Headlamp Low Beam Supply Voltage" in connector X4, which is the black connector.

 

It's always a good idea to verify the circuit you tap with a voltmeter or light, in this case while turning on and off the low beams.

 

df22f6ea-7896-49b9-b37a-bb36448d7d95_zps

 

x4connector_zps678962a1.jpg

x4labels1_zps86fc8602.jpg

x4labels2_zps296afaf4.jpg

after reading this, im curious f i could disable DRL in main beam by unplugging pin #7 this would eliminate the need for a wiring harness for HIDS, just always on when headlights on at full voltage.

 

 

besides this,

has anyone found out a way to control the fogs when highs are on? or is it just controllable wit lows but always on with highs?

Spurshot Senior Enthusiast

Spurshot

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after reading this, im curious f i could disable DRL in main beam by unplugging pin #7 this would eliminate the need for a wiring harness for HIDS, just always on when headlights on at full voltage.

 

I think a relay harness is still desireable with HID. The in-rush of current during start-up is the concern.

 

 

besides this,

has anyone found out a way to control the fogs when highs are on? or is it just controllable wit lows but always on with highs?

I haven't looked into this.

PMurray Enthusiast

PMurray

Posted
Posted

Finally got my Epistar LEDs installed. Total cost, just under $300. Fantastic (high beam) lighting.

Crf450r420 Enthusiast

Crf450r420

Posted
Posted

after reading this, im curious f i could disable DRL in main beam by unplugging pin #7 this would eliminate the need for a wiring harness for HIDS, just always on when headlights on at full voltage.

 

 

besides this,

has anyone found out a way to control the fogs when highs are on? or is it just controllable wit lows but always on with highs?

I like this idea. I'll have to pull pin 7 in X5 for the right side since I connected there. Next time I'm working on it with time. I'll try pulling it. If they are not running for DRL I can start using the entry and exit lighting again with less impact on life. Well at least the entry lighting, the exit lighting annoys me a little some times.

04GMshorty Enthusiast

04GMshorty

Posted
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does anyone have the diagram for the sle model trucks? im pretty sure this is the slt(led markers) diagram, Ive been trying to disable the drls and auto lights but the wires in x5 and x4 for the drls are not there on my sle..which leads me to believe the diagrams on up fitter are for the slt.

mafd2 Senior Enthusiast

mafd2

Posted
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does anyone have the diagram for the sle model trucks? im pretty sure this is the slt(led markers) diagram, Ive been trying to disable the drls and auto lights but the wires in x5 and x4 for the drls are not there on my sle..which leads me to believe the diagrams on up fitter are for the slt.

There is no wire on the headlight plug for DRL's on the SLE. May have to be done from the BCM. As you know there isn't a fuse for the DRL's on the '14 models. If you figure out how to do it please let me know.

Crf450r420 Enthusiast

Crf450r420

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Posted

I've found not all of the diagrams line up with actual trucks, so I doubt it's the SLE and SLT are wired different and more so the free diagrams are wrong.

EaZ8 Enthusiast

EaZ8

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what is it exactly in the truck, that when high beams are turned on tells te fogs to turn off?

is it programming or a relay?

Spurshot Senior Enthusiast

Spurshot

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Finally got my Epistar LEDs installed. Total cost, just under $300. Fantastic (high beam) lighting.

 

 

Can you provide more specifics? Bulb number, retailer, etc..

Crf450r420 Enthusiast

Crf450r420

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what is it exactly in the truck, that when high beams are turned on tells te fogs to turn off?

is it programming or a relay?

Programming in BCM
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PMurray Enthusiast

PMurray

Posted
Posted

 

 

Can you provide more specifics? Bulb number, retailer, etc..

 

 

Can you provide more specifics? Bulb number, retailer, etc..

PMurray Enthusiast

PMurray

Posted
Posted

 

 

Can you provide more specifics? Bulb number, retailer, etc..

PMurray Enthusiast

PMurray

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Posted

Spurshot-

Infinteoffroad.com supplied two Epistar 36 watt units locally installed. Mounted behind grill on each side of GMC. Installation estimated at $150, billed same in spite of 6 hour actual taken.

 

Units come on w/high beams and do what GM should have done. Great lighting.

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