04 s-10 factory fog lights

[ben361]

I have an 04 s-10 4X4 and I have installed the factory fog lights and the factory switch in the dash. It appears the the switch olny sends a short signal to the bcm which turns the fog light relay on. Dose anyone know how to program the bcm so that the fog lights work.

[BlazerLT]

Is the relay there for the fog lights?

[ben361]

yes, the relay is there, The switch on the dash sends a ground to the bcm. The bcm grounds the relay to switch on the fog lights. I have tested all the wires and it stops at the bcm.

[BlazerLT]

new relay needed?

Bad ground?

Wired Properly?

[ben361]

All the wires were pre wired in the truck from the facory, I did test all of them and all good. The relay was replaced with the horn relay and, same result, horn still works, so not relay problem. I connection stops at the bcm. Why would fog lights go through the bcm???