Aftermarket alarm removed, now alarm system won't work
 

So I have a 2013 FRS and the previous owner had an aftermarket alarm installed (possibly from the dealer). I had it removed, but now the stock alarm does not work. Basically locking and unlocking my car does not make a beeping noise and pressing the panic button does nothing (no sound or lights flashing). The car does lock though.

Is there a way to reset/reconfigure the alarm and how? Please help and thanks!

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