How do you disarm car alarm on BMW 325i?

To disarm the car alarm on a BMW 325i, you can typically use the key fob by pressing the unlock button. If the key fob doesn't work, you can also try inserting the key into the driver's door lock and turning it to unlock the door. If the alarm continues to sound, starting the engine with the key may also help reset the system. If problems persist, consulting the owner's manual or a BMW dealer may be necessary.