I was out fitting my striker plates this morning (If you're really interested http://www.audi-sport.net/vb/a4-s4-forum-b5-chassis/142311-new-striker-plates.html#post1440329) and with the doors open I noticed the central locking pump was ticking. I shut all doors and it stopped after a couple of seconds.I locked and unlocked the doors and it stopped. Opened them again and it carried on. I offten work with the doors open and never noticed this before. Any one came across this before or any ideas why? I'll get VCDS on it soon as possible and check for errors.