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This sounds very familiar to me. I bought a used boxster about 10 months ago. I had the following electrical problems:
- Windows wouldn't go down
- Power top wouldn't work
- Doors would not lock
- Alarm would not work
- Dome light would not always turn on, but sometimes did and stayed on
As with you, all of the 'major' things worked (starting, headlights, etc.) So basically not all of the exact same issues but enough that is most likely the same thing.
There is a computer that controls all of the electronics located directly underneath the driver’s seat. This controls all of the functions you have mentioned. There are also 4 drains in the front underneath the hood of the car that are designed to help water flow out of the car. These drains can get clogged and must be cleaned out (this should happen at service intervals, but you can do it yourself simply with your fingers for all major chunks). My drains got clogged with leaves over time because my used boxster had been sitting in a parking lot for 2 years. The annoying thing is if these drains get clogged water can leak under the seat, which of course, is where the said computer resides. Being a computer engineer I have the expert knowledge to know the following equation, Computer+Water = -$. Have this checked immediately, I could be wrong but it sounds so very familiar. Also, when this happened to me, they found the issue and I decided to wait a month before I fixed it. I drove home and the next day my car wouldn't start. I should have left it at the dealer. Oh well.
A quick and easy way to check this, is to pull the drivers seat forward and feel if there is any moister built up behind the seat or on the floor. I also needed to replace the entire draining system on my boxster. My total cost for this and replacing the computer was around 1200 bucks. Keep us posted and good luck.
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