According to this thread: https://rennlist.com/forums/993-forum/623800-996-997-heated-seat-connectors.html the 987/997 seat heaters work differently than the 986/996 seat heaters in that they don't use a relay. (See the 9th post in the thread. That post also states that a red wire with purple stripe provides the power to the seat heaters.)
You MAY be able to use the OEM 986 switches to control the heating elements in your seats. I'll take a look at Dennis Vogel's instructions and see whether I can puzzle out how to adjust for the differences in the operation of the two systems.
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2000 Arctic Silver/Black, Hard Top, On Board Computer
PNP Rear Speakers, HAES 6-Channel Amp, Avic Z140BH,
Painted Bumperettes, 2004 (OEM) Top, Homelink integrated in dash with Targa switch, 997 Shifter, Carrera Gauge Cluster with silver gauge faces, heated 997 adaptive sports seats, Litronics, silver console
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