Why is my central lock not working?

if you’re meaning the button on door isn’t responding to key proximity then I’m gonna say replace remote battery and once done that you’ve gotta let it reprogramme which it will do if you turn ignition to ac and let the key displayed on ignition lights change from red to blue BEFORE attempting to turn it over…

@umeshlokhande you are not telling us if it unlocks the other doors. If it does, it is the actuator in your door that has issues.

For now, we do not have enough information to narrow it down so here is the part of the SM that deals with the power looks Security And Locks Use that to narrow the issue down. Let us know what you find out.