Up for sale is an Working, in excellent condition Peugeot 505 Central Locking ECU Relay. This will work in many Peugeot & Citroen with Central Locking.  I will warranty this unit to function for 30 days after purchase.A faulty unit can be noted by central locks that randomly do not work, only work when it's wet, cold humid or when you hit bumps. I have also seen some that just "go off" when ever they please, locking and un-locking the doors when ever they feel like it. You can try re-soldering your old one, that sometimes works but replacing it with a known good one is a lot less effort. These units now have to be special ordered from most dealers for big $$ if you want a NEW one, and finding one second hand is becoming a chore. Get a good working one here and now for cheap!