Does not give a sound or show signal light when locking or unlocking the car?

Hello,

It sounds like an issue with the central locking alarm system for the vehicle.
First try to reset the alarm system. Which should reset it to factory setting.

Try these steps:

Unlock the vehicle twice with the key fob.
Then push the panic button twice, that should disable the alarm.
Roll up the windows and lock the vehicle.
Wait five minutes while be sure to keep the fob at least ten feet from the car.

This should reset the alarm.

Here is a helpful article:

https://www.2carpros.com/articles/how-to-reset-a-security-system

Please let me know of any questions.
Thank you.