When I open my car door, the alarm comes on and won't turn off. In addition, the car is not starting.
Have your battery tested. Most likely it is worn causing low system voltage to the rest of the cars computers. This will cause a number of issues - including problems that will set the alarm off unwarranted. If you need help with this, a qualified technician can inspect your starting system and alarm issue to determine what fixes will be needed for your vehicle.
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