Thanks for the donation.
For the rear defroster, you probably have broken or corroded contacts (the black lines on window). Clean the contacts with electrical contact spray and a q-tip to see if this helps the issue. If not, the contacts may be broken. If so, there are products you can purchase that will fix the broken contacts.
For the int. Lights and door locks, it sounds like there may be a door ajar switch that is sticking or faulty. Try spraying all door jambs (try one at a time to find the right switch) with WD-40 or similar product. This should temporarily fix the problem. If it does fix the problem, you will know which door switch is bad by spraying them one at a time.
Hope this helps.
Thanks for using 2carpros. Com!
Thursday, January 1st, 2009 AT 9:01 PM