1. Turn off the car's ignition.
2. Open the driver's door.
3. Locate the alarm control module, which is usually located under the driver's seat or in the trunk.
4. Remove the cover of the alarm control module.
5. Locate the reset button on the alarm control module. It is usually a small, red button.
6. Press and hold the reset button for at least 10 seconds.
7. Release the reset button.
8. Replace the cover of the alarm control module.
9. Close the driver's door.
10. Turn on the car's ignition.
The car alarm should now be reset.