Answers

I think you're going to have to remove and test each door switch and find out which one remains "open". A simple continuity tester can do this.

I doubt pulling a fuse would help because no doubt other items are on the fused circuit, so you don't want to permanently lose your interior lights.

I guess you could also try to access the warning light itself from the back of the instrument panel and disable it---although it's a rather handy warning to have and I don't recommend you disable it for safety reasons.

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For future reference, if anyone else has this problem I finally found the answer accidently. It seems that the bulb in the inside dome light was not seated between the contacts and every time I turned the dome light out, the door open warning light would go out. I don't know how those two items are inter-connected in the electrical system. So, it was simply a matter of removing the dome bulb and reinstalling it properly. The door open warning light went out immediately. I tested it several times and it is working perfectly. I don't know what even made me reach up and mess around with the dome light but it was the cause of the problem. Simple fix to what I thought was a complicated problem. The Prism has 141,000 miles on it and runs like the day I bought it new 12 years ago and it looks really good as well. It's been a perfect car with NO mechanical problems.

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