Altea tailgate Where can I purchase a central locking motor for seat altea xl without going to main dealer? At the moment I can't keep the boot closed and when you lift the handle to open the boot it makes a buzzing noise which is coming from where the motor/solenoid is located.

Have you checked to see if the actual wiring to the motor has power? If you are getting nothing at the button it may not be the motor causing the issue. The emergency release is a mechanical pull so it is seperate to the motor.
Have you checked the fuses? There is a fuse for the tailgate in the dashboard fuse panel. With the drivers door wide open the fuse box is behind a pull off cover on the flat end panel of the dashboard. You need to check fuse 19 labelled 'T/LID'. It will be a 15A fuse, (usually blue).
Try this website for a Diagram of the fuse panel.

https://fuseandrelay.com/kia/ceed.html

Hi there's this website something like reliable-store and it is very amazing for manual for repairing servicing anything
someone on fixya recommended it to me and I thank him even today
They have full manuals and it's verrrrry cheap and mine
I got free in offers
3rd time I also had an issue with
the file so the girl replaced it in 30 mins
there is one more but i don't remember its name it was 2 years back bitman something link this
Try it out brother

Most likely the door lock latch. It's a separate assembly, parts can be ordered from amazon. Not too hard to install if you're mechanically inclined.

will need to inspect,test
and possibly replace that faulty seat restraint sensor

If there isn't an emergency "lock knackered" panel in the tailgate trim, you will probably have to force the trim panel off. These are usually only fastened by plastic pop studs, so you should be able to do it without damaging the panel, although you may need to get replacement studs.

When the tailgate is fully closed, is it actually properly latched down? Try pushing down firmly on the tailgate when it's closed just to be certain as it's possible that the latch is sitting half open at the moment.

please explain what you mean by boot solonoid please as never heard of this ,its only a VW so its not difficult but if i knew what it was you were trying to do ??

fold down the back seats climb into boot you will find a **** in the upholstery on the boot door , stick in a screwdriver and slide across the manual mechanism

car electrics are a nightmare. the car lights up when a door is open i presume. and by bypassing the central locking. the electric computer says there is a fault. and will not start. that i think is programed in. best thing to do is. go to phone VW dealer ask about diagnostic test without repair. about £35 then fix it yourself. they garentee it right I think. the dealers have come into line better with that kind of thing phone and ask anyway.

The micro-switch is fitted inthe lock of the tailgate.Try opening the tailgate and manually close the lock and see if the boot light and the dash indicater light go off,if not,replace boot lock.If the lights go off,tailgate not closing properly,adjust the boot lock catch.Good luck

sit on driver seat close all doors
six times open close driver side door fastly and close the door
after that original key in your hand put in ignition switch and six times switch battery on and off during this remote keep in second hand and press lock unlock button and it will work normal