If you've been playing with wiring then go over your tracks to see if you've disturbed any airbag plugs, under the seats, door pillars for seat belt tensioners, side airbags etc etc
If you have disturbed anything but then put back then it might just need the code clearing with vagcom as it does this with battery connected still when doing any wiring work & disconnecting things & then wont come back unless a fault is there, but usually once cleared if its fault it comes back straight away, otherwise it clears light goes out fella.
Did you remove the seats at all or remove any parts to do the wiring work etc?
& yes welcome but could you please use proper english rather than text, not being anal just a forum undocumented rule I'm afraid.
But we are very friendly & will help you as much as possible, trust em, lol.