on all three of your questions can be found some excellent post through the SEARCH function. not being a dork - but it really is kind of awesome what kind be gotten from this forum.

1) I am not sure what the model year cut-off date is for the end of wiring harness problems, your car could be O.K.

2) for the C.E. light go to an AUTZONE if they are available where you are and have then pull the codes, come back here with the numbers and find out what they indicate.

3) thw wiper info is right on, a little searching will find a URL with Baylor in the title that has pics (I think) on doing the wipers.