vk,
Are you in a cold climate area and have had a lot of rain or wet snow? Ours got water into the door key cylinder switches after we had a wet snow and then a hard freeze overnight. The dealer could not pin point which switch so replaced all 3 of them under warranty. I know you are out of warranty but the switches are something to look at if you have had the heavy rain or even washed the PT and it dropped below freezing that night.
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John & Terry 
"His" - 2002 Inferno Red Touring Edition
"Hers" - 2003 Electric Blue Limited Edition
Del Val PT Cruisers
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