How do you disable the factory alarm system on a 1990 Mazda 626?

To disable the factory alarm system on a 1990 Mazda 626, locate the alarm system's fuse in the fuse box and remove it. Alternatively, you can disconnect the battery for a few minutes to reset the alarm. If the alarm is still active, you may need to use the key in the driver's door lock to manually deactivate it. Always consult the vehicle's manual for specific instructions related to your model.