New to the forum so I hope this is ok to start here. My central locking system stopped working also. Different vehicle though, 88 560 SEL. I do not even hear the pump which I think is located in the trunk. Just not sure where. I can only manually unlock driver and passenger doors with key. Where should I start to trace the problem from. Thanks in advance for any help / solution.

__________________
Jacamo9

1988 560SEL (223k daily driver)