There's a troubleshooting procedure in the shop manual that goes through what to check, step by step using a multimeter. I found a copy of it posted online. Here's a link: https://www.justanswer.com/porsche/3vq2d-own-2004-boxster-s-the-top-will-not-go-down-when.html
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I am not an attorney, mechanic, or member of the clergy. Following any advice given in my posts is done at your own peril.
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