CLK locking going up/down/up/down...

[shentodj]

Central locking just started to behave funny on my wife's 2003 CLK.
When lock car with remote, the door pins go up/down/up/down etc several times.
Also happens when central locking activated after driving off.

Any suggestions for what's causing this - other than "yet another cr*ppy electrical problem"!

Regards,
Shentodj

[shentodj]

Can you remember how much it cost to replace this Central Locking motor?

Regards,
Shentodj