After Market Fog Lights with Factory Switch

[Paul94Z28]

Hey-

I am looking to wire in aftermarket fog lights but use the factory switch (and part of the wiring) to turn them on and off. Does anyone happen to know which wires are involved coming off of the factory switch? Looking to bypass using the BCM and associated cost of dealer programming.

Thank You!

Paul

 

[Paul94Z28]

I downloaded the manual and found BN/WH outbound to fogs and YE for switched power. I am going to splice the aftermarket kit in there and see how we do.

 

[BigLee]

I have looked at this, and it looks like it could work if you connect the factory switch, which is a momentary switch to request the BCM to turn the factory fog lights on/off, by using a logic board that converts momentary inputs into on/off control for a relay.

 

[CoHPhasor]

I have looked at this, and it looks like it could work if you connect the factory switch, which is a momentary switch to request the BCM to turn the factory fog lights on/off, by using a logic board that converts momentary inputs into on/off control for a relay.

This is something I don't approve of.
Let's say you assume the first press is always starting as off - you can miss a press, or your debounce code could suck.
I would prefer to tap the power at the dashboard fog light LIGHT.
If the light is on, the car both thinks fogs are on, and you will never be out of sync.

This becomes a much simpler piece of Arduino code. (IF input HIGH: Make output pin HIGH, etc)
Unfortunately, the down-side is that you have to fiddle with the cluster, and it could be funky, not nearly as simple as "tap a wire under the dash".

 

[BigLee]

This is something I don't approve of.
Let's say you assume the first press is always starting as off - you can miss a press, or your debounce code could suck.
I would prefer to tap the power at the dashboard fog light LIGHT.
If the light is on, the car both thinks fogs are on, and you will never be out of sync.

This becomes a much simpler piece of Arduino code. (IF input HIGH: Make output pin HIGH, etc)
Unfortunately, the down-side is that you have to fiddle with the cluster, and it could be funky, not nearly as simple as "tap a wire under the dash".

I've used one of these basic momentary to latching logic modules on a project years ago, never had any issues with it.
It worked reliably without any glitches.
You don't have to "fiddle with the cluster", unless you feel you just have to have the fog light indicator working in it.
All you have to do is replace the standard headlight switch with one with fog light option, add the extra pin/wire to the HL switch connector.
The rest of the wiring is pretty basic.

 

[Mudflap]

I'm doing one of these kits too, so after getting the hardware in I think I'm just gonna have to swallow the dealer fee for reprogramming..