hi a have a disco 300tdi my alarm thinks a door is open when the car is locked help

Check all the pin switches on the doors and bonnet.

You could try disconnecting them one at a time and then locking it to see which one is causing the issue. My money is on the bonnet switch.
 
i have looked at the pin switches they look fine.when the alarm is on and i lift the bonnet the alarm go off but when i do the doors then alarm dose not go off
 

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