I think that may be a misprint. Terminal 85 on the relay/block is the ground for that circuit. Can’t locate a 31 in the diagram.
Couldn’t hurt to trace that ground to GP8.
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-Chris
2004 Porsche Boxster 2.7 (gone  )
2004 Porsche 911 C4S Cab
1991 Porsche 911 C2 Targa 3.6
2017 Subaru Outback 3.6R
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