Just added fog lamps to my base model Matrix:
Bought:
* used headlight/turn signal stalk with fog switch ... $45 shipped
* used relay ... $5 shipped
* new aftermarket pair of fog lamps ... $68 shipped
To install:
* pulled off the front bumper (needed to get to a little fender bender anyway
* pulled out big black plugs from fender, popped in fog lamps
* freed up fog lamp wires from headlight wiring harness on either side ... they're just taped up in there, sitting out in the open once the bumper is off
* installed bumper and plugged in fog lamps
* inside the car, removed the steering column cover (3 screws, the top and bottom covers pop apart, then fineagle them off the column)
* unclipped wiring harness from existing headlight stalk, popped stalk assembly from steering column bracket, popped in new assembly and plugged in wiring harness.
* Under hood, opened up drivers side fuse box and placed relay in top right position.
* There should be a 10A fuse just to the left of the relay. In my car there was already one in place for some reason.
That's it ... the fog lights look so much better than those black plugs
Fyi you can do this without removing the bumper. You will need to remove the two bottom bumper screws on each side that hold the dust cover, then you can swing the dust cover down and out of the way to get to the lamps