2002 deville wont start

The ignition lock includes the steering wheel lock. It's possible that it just needs lubrication, or that the lock part has broken. In either case, taking the covers off the steering column sounds like your next move.

It sounds like the neutral safety switch is going bad!

I'm assuming you mean your key wont turn in the ignition. first off check to make sure the car is in park. then what you gotta do is put in the key and put a little pressure as if turning but dont turn too hard, then even though the steering wheel is locked you will have to try to move it a little, if you parked with your tires turned then you will want to try to turn the wheel in the same direction, (even locked you should be able to move it about a half inch) you will have to turn the wheel hard but it should move enough to allow the key to turn, you may have to jiggle the key a little in the ignition but it should eventually turn, just remember not to try turning the key too hard, the extra force wont make it go but can cause the key to break. this tends to happen when you turn the car off andthe steering wheel gets locked if the wheels are turned hard in either direction. also if multiple attempts at this still dont work, try taking the key out and turning it over and trying again. Even though both sides of the key are identicle, because of wear on the key and the ignition, sometimes when the wheel locks the ignition, it will only turn if the key is put in a certain way. Hope this helps, good luck

In the fuse block under the drivers side rear seat check the ignition 0 fuse. In the under hood fuse block check the B/U fuse and the BTSI fuse. If the b/u fuse is blown than you would not have back up lamps.

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I have an 2002 Escape. I can think of three possible issues:
You're using the wrong key. Duh.
You have a bad ignition switch. Extremely unlikely.
Your steering wheel is pushing against the steering lock. I just went out to my Escape to confirm this on mine. This happens sometimes if you park against a curb, or parking block. The steering wheel is pushed against the lock pin, and the key can not be turned.
Trying turning the sterring wheel back and forth. There should be some play or shake. If no play, turn the steering wheel a little harder in either direction until it moves a little, hold it, and try the key.

For the disbelievers, this can happen on most cars. Go to your car and hold some pressure on turning the steering wheel. Try turning your key from off to start.

Make sure the shifter is completely in park.
But yes it could possibly be the ignition lock cylinder, or the ignition module on the steering colum.

try moving steering wheel as you enter the key

you might need to get rough with it, a friend of mine had the same problem, we got a little physical with the wheel and ignition finally turned over, try to center your steering wheel before you park to save this from happening again

the shifter needs adjusting. try to remove the key while moving the shifter back and forth in park.

The steering column sounds locked. Try turning the steering wheel all the way left or right till you hear it unlock or until the key can turn. Note; You must use force to unlock the steering column and don't be scared because it won't break anything.