Now you see why people are happy to pay for a retro fit
There is a sequence for clearing the memory and resetting the code.
It is in the owners manual and varies from maker to maker.
I got caught out servicing one because the reset information was wrong for that model.
Turn the blades on & off a few times then unplug the seat switch and reconnect it making sure the switch is fully home as there is a shorting strip inside the seat switch plug .
BEcause of variations in manufacture some will activate if the plug is the slightest bit loose .
The smart switch was such a dissaster in OZ the following year they went back to a key,
The standard switch is 532 18 3-50 and can be wired back in fairly easily.
The system goes into auto lock after around 5 minutes
When you get off the seat the blades stop spinning instantly
When you go into reverse the blades stop spinning instantly.
So it is easy to forget to turn the blades off because they have already stopped