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The switch plugs in there's no pinning required however it won't function unless you were to be able to program your BCM accept the rear fog lamp input and to activate the rear fog lamp controls, and then you could wire in your light bar relay to the body control module.
 

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The issue is that the rear fog lamp switch and the fog lamp switch are the same switch, it's just a different voltage signal to the BCM based on what half of switch is pressed. That voltage signal then is utilized by the BCM to either activate an output to control the front fog relay or the rest fog relay. North American cars don't have the circuits from the BCM to the relay center, nor do they have the circuits in the fuse block to support the rear fog relay as far as I recall. Programming the BCM to properly acknowledge and then act on the signal it would receive from the euro switch is the "hard" part.
 

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It's not a straight forward answer. GM changed the BCM programming levels and harnesses on cars from year to year some cars have the programming for front fog lights and just need a switch and underhood wiring. Others require programming. If you get a GM fog light switch, and plug it in to your car, then press the fog lamp button and it turns on the fog indicator on dash and activates your parking lights your good to go. If when you plug in a fog equipped headlamp switch nothing happens your best bet is gonna be to go full aftermarket.
 
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