In my 2005 Roadster the ignition cut-out button in mounted on the left side of the engine compartment attached to the bulkhead just behind the wiper motor and radiator reservoir. I believe it is reset just by pressing it.
Yes that it where mine is. When I picked my car up the dealer went to great lengths to explain where it was and that it can activate sometimes from a jolt rather than a crash also that if the wipers stopped it is usually the connecting plug needs pushing together. That is also left side attached to bulkhead.
Glad you got it going Felix
