How do you disable a 2003 Toyota factory alarm?

To disable the factory alarm on a 2003 Toyota, you can use the key to unlock the driver's door, which typically disarms the alarm system. If the alarm is triggered, insert the key into the ignition and turn it to the "ON" position. If that doesn't work, try disconnecting the battery for a few minutes to reset the alarm system. Always refer to your owner's manual for specific instructions related to your model.