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if the alarm is going off all the time or at random intervals then the 1st thing to try is closing all the air vents inside the car
as this prevents outside breeze's blowing in and setting off the microwave motion sensor
if it helps then the dealer can lower the sensitivity level
have you tried what I suggested?
in that case try the following
put the key in the drivers door lock and turn it a couple of times...then try starting the car... and then use the actual key in the trunk lock of the car...turn the key to unlock the trunk which should reset the door module and so the alarm
if this doesn't help then I'm sorry to say that the car needs to go back to the dealers to reset the security system
sorry to say that this is often the case with security aspects as by their very nature they cannot accessed with DIY methods
not the best news I know but not much else that can be done