On the 93s it is located behind the right side of the dash above the heater box. It is probably in the same location on your car. It can be seen in the following pic above the heater core:
It's not a very fun job. The modules don't go bad too often. Usually it is an ignition switch or wire problem within the column. If you have a remote starter installed then there could be a problem with the bypass. Let me guess... the car dosen't start and the security light flashes?