How to Disable an OEM Alarm on a 2000 BMW 325 Ci

1. Deactivate the alarm by pressing the unlock button on your keyless entry key fob twice. If you lost the key fob, simply put the key in the driver's side door and unlock the car to deactivate the alarm.
2. Put the key in the ignition and turn it, but don't start the car. Then, locate the alarm override button, on the driver's side kick panel. Push and hold in the override button on the box until the car alarm beeps once.
3. Find the fuse box with the alarm fuse in it. The BMW 325 Ci has three fuse boxes. One under the hood of the car near the battery, one behind the passenger seat and one in the trunk on the right-hand side. The diagram on the fuse box panel tells you which fuse goes to the alarm. Use a fuse puller to remove the fuse so you don't damage the surrounding fuses.