Central locking with BMW alarm woes!

Hi all...

I have the BMW alarm / central locking unit install. It has been working fine for about a year. Today, the alarm still chirps correctly (one for arm and two for disarm), but the door locks are not locking.

I recall reading something about this, but I've searched through various archives and can't find it. Does anyone have a clue as to what might be the problem?

Also, if I lock the car by either pressing the lock into the door or by using the key and then I use the alarm remote, the following happens:

1) If the doors are locked and I disarm, they unlock.

2) If the doors are locked and I arm, they also *unlock*!

Under no circumstances could I get them to lock. The fuses all look good.

Help!

BTW, the locks DO work. Locking one door locks the other.

Thanks,

/greg

p.s. I guess I should mention it is a '99 M Roadster.