Replacing Ignition switch
 

Need to replace my ignition switch on 1999 S70. Looking for general instructions. Do I have to pull the air bag assembly and steering wheel?
Getting a used switch with key from a bone yard, are the any catches to getting the computer to recognize the new switch and key etc. Any insight to avoid potential problems would be much appreciated,

If you aren't replacing the entire ignition switch assembly, IPD has a tutorial PDF on their site. Judging by the pictures, you might be able to remove the whole assembly by just removing the bottom panel on the steering column (just behind the steering wheel).

Here's a link to their PDF:
http://www.ipdusa.com/uploads/sku_files/10766_INST.PDF