As rockinwagon notes the problem is probably the CCU. If you are adventurous you can repair it yourself. It may take a couple of tries though.
First thing to do is remove it. Not hard to get it out. Several threads explain that. Then get it apart to where the printed circuit board is exposed. Then take it further to where the relays are exposed under the circuit board.
You will need a good soldering iron and a magnifying lense. Get a temp contolled iron if at all possible.
Examine the circuit board closely. You will very likely find some cold solder joints throughout it, but it can take only bad solder joint to cause it to fail.
Check the edges where there is a line of solder along the vertical short boards. They get fractures there.
Then turn it over and use a very thin strip of very fine sand paper or a very thin point file and clean up the contact points on the relays. They get cooked with the voltage running throught them.
After everthing is resoldered, and before reassebling the covers, take it back to your car and plug the tow wiring harnesses with the CCu hanging out where you can see it. Start the car and run it through the paces to see if it works now. You will be able to see the relays open and close, I used a small probe to push them around, found out one was still in need of attention.
That is how I got mine to work again, the caution is that once you attack the CCU with the soldering iron it is no good as a core should you decide to send it out to a rebuilder.