Originally posted by bavarian3
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There's a bunch of different configurations for the switch panel, so lots of wiring diagrams as well. Here's an example one with the sport button labeled (look for "driving dynamics"):
IIRC, the button pulls to GND and the DME reacts accordingly. If you emulate that with the ZCP button, it should just work. I would stick a multimeter on the output pin of the button (with everything connected) and see how it's set up. Then do the same on the ZCP trim.
Here's an excellent resource on how the switch center works electrically: https://nam3forum.com/forums/forum/m...087#post246087
Another option is to swap in the E39 M5 wiper stalk. Identical to ours, except for an extra button (conveniently) labeled "S" at the end of it: 61318375407. I know for a fact that this one pulls to GND: https://nam3forum.com/forums/forum/m...950#post254950
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