You can start by checking all of the fuses to see if one is blown. If you dont find one, there could be a problem with the wiring under the carpet, or a problem with the fuse block. If that is the case, it is probably time to get some help in the form of a wiring diagram, or someone with the skill to troubleshoot the electrical issues. Let us know if we can help in any way.
There are some websites where you can pay a fee to access the vehicle service info on a daily our monthly basis. However, by the time you part for that, it would not cost much more to have a professional diagnose it for you.