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On my 01 coupe previously, my fog lights would come on if I turned the headlights on or if I turned the light switch half way. Now they won't come on at all but they do flash when I activate and deactivate the alarm. FWIW - the vanity mirror in the driver's sun visor came out and now that I've re-secured it, it does not light up either. I don't care about the vanity mirror but I like the look of the fog lights. Any ideas?
Assuming that the switch for the Fog Light is on then it could be a switch problem since they work when you turn on the car.
Did you put in a CLB and pull that switch out not connecting it properly later or maybe the wires wiggled loose?
You might try setting your car to auto headlights and with the switch on to see if they come on when the headlights come on.
Another check to see if they are working properly is to have the approach lights on (in the DIC not sure of the name right now - too early for me). When you unlock your doors all the lights should come on and if the Fog lights come on then you know that they are working correctly and again that may lead you to the switch.