Some steps you can take to address the buzzer issue in your 2010 Toyota Corolla Altis:

Check the owners manual: The owners manual should have information on how the buzzer works and how to adjust it. This will help you understand if the buzzer is functioning properly o r if it needs to be adjusted.

Check the fuse: If the buzzer is not working at all, it may be due to a blown fuse. Check the fuse box and replace any blown fuses.

Check the wiring: If the fuse is not the issue, then its possible that the wiring to the buzzer has become loose o r damaged. Check the wiring to see if there are any loose o r damaged connections.

Test the buzzer: You can test the buzzer by using a multimeter to check the continuity of the circuit. If the circuit is complete, then the buzzer is working properly.

Take it to a mechanic: If none of these steps work, then it may be best to take the car to a mechanic who can diagnose and fix the issue. They may need to replace the buzzer o r make other repairs to get it working properly again.