Also please confirm the pinouts for S1.
The colours of the wires go absolutely contrary to any scheme I know of. Pin 1 (GND) on your diagram has a red wire attached, and pin 6 (VCC) has a black wire.
Dear Simon,
If you look carefully on the white plastic connector shell:
There is a small “printed” dot near black wire ( this is the pin 1)
I connected my reach M+ with black to 0V and red wire to +VCC (5V)