Deactivated alarm signal

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Sweden
#1
Hello!

I just bought a second-hand 528i A (dont know what that means even). With the keys i got one for the alarm (according to the dealer) and it was to activate and deactivate the original alarm (a Carguard alarm is also installed). When the alarm goes off, there is no signal with it and im guessing its got to do with that key.

Where on earth could that key go?
Tried looking under the hood, but that keyhole must be small/hidden.
 


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