2019-2023 Headlight Switch Pinout

[Resident_Ranger]

I'm wondering if anyone knows or has a diagram of the pin out on the headlight switch with fog lights. I'm hooking up fog lights in my 2023 and I'm sort of hoping I can manage to get it running with an original switch instead of adding a new one.

Just to be sure the switch I'm working with looks like the picture posted below.

 

[franklin2]

As you can see in the diagram below, your headlight switch does nothing but ground certain wires from the body module. All the work is done in the body module.

 

[Curious Hound]

As you can see, the switch should already be wired for fog lights. The rest of the fog light wiring may be installed in your truck. It often is in later vehicles. Just install and connect the lights to the existing harness, ensure the fuse and relay are in place and enjoy your fog lights. The light harnesses are usually fastened out if the way somewhere near the headlights.

If that doesn't work, you'll have to figure out what parts of the harness are missing and replicate those parts to finish the circuit.

The reason the circuit goes through the Body Control Module (formerly called the GEM) is because the BCM contains the timers for delaying lights off and also the battery saver relay that prevents killing the battery if you leave the lights on with the key off.