assuming you have a G3(i think you do), you can remove the knee panel by removing the coin holder(genlty pull on it when its open) and there should be a philips head screw in there. its screwed in at a angle almost. then there are two more philips head screws on the lower left and right corner. then the bottom of the panel should be loose, there is two clips in the upper left and right hand corners. its easier to pull on the right side(side next the radio) with even pressure, increasing pressure until it pops. if you pull to hard you can warp the plastic(when you put it back on, it will not sit flush). then just pop the left side off. it should be out, then there should be metal reinforcement bar, just remove the 2 10mm bolts that and slide it up and out. this will not give you that much room, but it may help. the area you are going to work in is very tight. it gives you easy access to the fuse panel though.

have you verified that you did not hook it up wrong? did you check all fuses?