take front door cars off and look on the lock barrel u will see the sensor rapped around the barrel ,black circular plastic clip ,just undo it from barrel and leave it in bottom of door , there is also a multiplug iirc u can dismantle aswell ,but there are loads of multiplugs inside door so watch what ones u dismantle , u can also disconnect the push sensor on front upper panel where vin tags are that detects the bonnet aswell

the brains for it should be above ur feet at the pedals also and is marked that its for the alarm system