Re: fog lites on hi and low
Dealer can't change it via software. Reason is, GM is following state laws. Most states require the fog lamps to dim with the HI beams, so they conform to state laws. (Not that the police ever enforce this law.)
As long as you isolate the circuits to prevent feedback to the computer, the only warranty you would void is the warranty for wiring you cut into.
I have tapped into many wires in almost all my vehicles, and no one has blamed the wiring for a fault and refused warranty on any item.
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Black Sheep Hummer Squadron
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