Here is a post on Renntech with the instructions: Reverse Signal Wire Hook Up - 986 Series (Boxster, Boxster S) - RennTech.org Forums
Unfortunately, it looks like the photos have been deleted. They were working on a 996, but the 986 is the same.
When I installed my Traffic Pro, I did not hook up the reverse wire and the only issue is that the reverse arrow doesn't show up.
I don't know the answer to your question about the climate control.
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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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