Seatbelt light on dash have been staying on as of 1 month now,when seatbelt is being worn and is inserted?

most likely the sensor that tells the ECM when the seat belt is being worn or connected to stop the light flashing on the dash

Sounds like the door switch is not switching or not connected. Sometimes the switch is external in the door jamb/closing area, sometimes it is part of the door catch. Maybe check if the door light on the dash stays on, also if the interior light works on door setting.

check the plugs under the driver seat if there not damaged replace the buckel becarful of a yellow conector that is the air bag system should be gray or black 2 pin conector for the buckel

Any car produce after 1996 can be scan with an OBDII reader.

Check the date code on the battery to rule out old battery.
All battery has a service life of 48 or more month.

Also check the belt tension. When the 2 arrow / dot meet the it is worn.

A worn tensioner will not create enough frication to the alternator pulley.

Have the same problem in my 98 Toyota Rav4. I squirted the female buckle (bolted to seat, not holding strap harness) with wannabe WD-40 lubricant from the $1 store, and it seem to have solved the problem. I'm guessing the spring mechanism is worn out, which is why the harness buckle won't lock. Another solution is to replace the female lock buckle with an identical part from the used parts junkyard store.

The seatbelt light on the dash stays "on," even when everyone has their belt on, but I don't bother servicing that. If yours have an audible alarm instead of an indicator light on the dash, locate the source of the alarm sound and disconnect the wires to silence the sound.

You most likely have a bad seatbelt buckle. It's a common thing.

A scan tool is needed to reset the seatbelt light, unhooking the wires turned the light on as a fault, a scan tool will reset code. also make sure all connectors are connected good, the computer may reset itself after it sees a few key cycles and tests the system and it passes but it may take awhile. i have seen some that will stay on until they are reset, if the light is still on after all this time then a scan tool will be needed to turn off the light. good day.

dash light fuse and back feed through a bulb

Just recently, I inadvertently removed the yellow doohickey that holds the 2 x 10 amp fuses in the interior fuse bank of my 2002 WJ Jeep Grand Cherokee Laredo. I checked the fuses and they were ok so I inserted the fuse holder back in.. Low and behold the seatbelt and airbag light came on and stayed on. After several quick fixes etc to get the lights to go out, I finally returned to the fuse holder and discovered that A. You need to squeeze in the tabs to get the fuse holder out and B. the fuse holder when being re-inserted will not automatically clip in... you have to squeeze the tabs again to press the fuse holder fully home. I started the old girl up again and no more lights.

There is a tiny switch under the **** area of the seat that tells the car someone is sitting there... and a tiny switch in the seatbelt CLICK mechanism. These only have 2 wires which go down to the floor, alongside the running board and up to the dash. The switch nder your **** is NormallyOPEN and CLOSES (makes contact) when someone weighing 50lb or more sits in the seat (smart huh) It could be bent, broken, come loose from its moorings or have a wire loose... At the same time, the passenger seat also has shcu a switch and it might be STUCK or shorted. Same for the seatbelt CLICK mechanisms on both sides. If you don't like loosening seat bolts, pulling up carpeting and removing the inside panels, etc. what we call 'troubleshooting'. find someone that does - or take it to a dealer.