I HAVE FOUND ON THE INTERNET, THE FACTORY FOG LIGHT ASSEMBLIES THAT REPLACE THE STANDARD TURN SIGNAL ASSEMBLIES IN THE GRILL, ALSO FOUND THE COMPLETE FRONT HEADLIGHT WIRING ASSEMBLY THAT ALSO INCLUDES THE WIRING FOR THE FOG LIGHTS.
NEXT I LOCATE THE FACTORY LIGHT SWITCH ASSEMBLY INCLUDING THE FOG LIGHT SWITCH, IS THERE A FACTORY WIRING INSIDE MY 2003BLAZER THAT RUNS FROM THE FUZE BOX ASSEMBLY TO THE FOG LIGHT SWITCH, OR DO I NEED TO LOCATE THAT TOO? THIS WOULD BE A NICE FACTORY LOOKING UPGRADE ESPICALLY IF I USED AFTERMARKET FOG LIGHT BULBS.

 

Wrong section... DIY Submissions/Discussions is for submission and discussion of complete DIY articles.

*Moving to 2nd Gen Tech*

It is likely that you will have the wiring. Here is the kicker... You will have to get the PCM programmed to turn this option on. The fog switch just switches a wire that runs to the BCM. Without the proper programming, having all of the hardware is meaningless. The next kicker is that you cannot just walk into a GM dealership and have them turn on this feature. No one there knows the specific modification necessary. How they do it is if you can find the VIN from a vehicle that has this option PLUS all of the same options you have and the same year, then you can use that VIN to reprogram your PCM/BCM.

I would wire the interior switch to a relay inorder to control the lights. You will need to find some wiring diagrams to know what wires to use and where to find them.