Try this thread. I'm working on my 1991, also california. Try pushing the button on the 16 pin connector for about 3 seconds and then count the blinks. If you have more than one error, you will have to do that for each one, until you get back to the first.

For the codes, try this thread
http://www.peachparts.com/shopforum/showthread.php?t=23401&highlight=led+trouble+codes.

Good luck and if you post what you find, it will help me out with my ride.