Your ignition switch electrical portion has failed. To replace it requires that you remove the airbag (two 5mm allen bolts on the back of the steering wheel, and carefully pop the electrical connector out of the back with a small screwdriver or shim) remove the steering wheel trim, disconnect the spiral spring connector and the connectors for the switches, remove the steering wheel, making sure that the mark at 12:00 on the center of the steering wheel hub has a matching mark on the collar that it slides onto- you want to be able to line up the wheel accurately again so it isn't off to one side or the other (carefully, you don't want to damage the spiral spring assembly- also, don't turn the spiral spring) Then remove the switch assemblies, they are held on by three long standard head screws,
The next piece that needs to come off is the splined collar that the steering wheel mounts onto. First you need to again mark a spot on the collar, and on the actual threaded portion of the steering column shaft, so you can line this up accurately. Then you need to pull this collar off using a puller- if there is not enough of a lip on the back of the collar, you can mount a vise-grips BEHIND (do not clamp it ON the collar) the collar. Then there is a spring that slides off. The last part is the steering lock and switch holder. There is a bolt on the backside that clamps this holder to the steering column- but it is a shear bolt, so it does not have a head made for tools- you are going to need to grab it with a vise-grips, or cut a slit in the head (using a dremel tool or other cutting wheel) and use a screwdriver. Then this housing should slide off- however, you may need to turn the key if the steering lock has actuated- first disconnect the elecrical switch on the backside of the cylinder so that the electrical components will not be activated- or you will set an airbag fault, since the drivers' airbag unit is not installed.
The electrical switch is held into the back of this housing with a small phillips head screw- remove it, and pop the new one into place. Again, you may have to turn the key in the cylinder to seat the pin on the back of the cylinder into the switch.
Installation is the reverse process. When you put the collar back on the shaft (remember to put the spring on first) align your marks, then put the nut for the steering wheel on and use it to pull the collar down part way. Then remove the nut again and install the steering wheel (again, aligning your marks), and pull it down the rest of the way. Don't forget that the spiral spring should not be turned, and make sure to reconnect all your electrical connectors, especially the airbag (yellow)
Thanks for your response. It would help me understand it better if you could explain the logic for your diagnosis. In other words, how do you know its the ignition switch instead of something like a faulty ground, or relay switch, or some other electrical component?
This is a commonly failing part- and your symptoms are all the "common symptoms"- no wipers, brake light on, no headlights.
An ignition switch is cheap- and you can even plug it in without removing more than the steering column trim, unplug the connector at the back of the cylinder, and plug in your new switch. Then try turning the switch with a screwdriver in the slot- you can even start your car this way.