Central lock is not working (Nissan Primera 2004)

Hello,
I am very new to this forum and sorry in advance if I repeat the same question.

Car description:
Make: Nissan
Model: Primera sportdeck
Engine Size: 1.8 Petrol
Year: 2004

Let me explain my situation a bit. My car was working fine. But I didn't have a run for a week. And ended up with flat battery which requried jump start. After the jump start car is performing nicely again but the central lock is not working at all (with key remote). I need to manually open and close the door with keys. I assume there might be 2 problems-
1. Car key remote battery is gone. But both key remote batteries at the same time is a bit unusual.
2. Need to reset the central lock. But I don't know the procedure.

Is there anybody who can describe be how to reset the central lock? What are the steps and procedures? Could not find in the car manual.

Please help.

Thanks.