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It sounds like like a relay problem. First see if you have voltage DC before the relay. Then try jumping power across the relay. If the motor works you have a bad relay if the motor doesn't you may have a bad motor. Also if you do not have voltage DC before the relay with the switch in the on position you may have a bad connection in a harness or a bad wire. the wire can be checked with a continuity test with your meter in ohms. Also the harness can have the same test across the harness pins.
If you do not feel comfortable performing these test yourself anyone familiar with electricity / electronics should be able to help you. I believe you can fix this problem on your own at a minimal cost, however through Porsche could cost you a small fortune.
Hope this helps.
Jeffrey
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