Probably tripped the anti-theft device by not having the wire grounded. Re-check your work and search Porsche Becker anti-theft for a how-to troubleshooting guide. I have never faced this personally but I was warned about the Porsche-Becker boobytrap.
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2009 Cayman 2.9L PDK (with a few tweaks)
PCA-GPX Chief Driving Instructor-Ret.
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