door locks won't work on 1998 Mercedes-Benz E320 4MATIC

My door locks will not work. When I use the remote to lock the doors, only the alarm system is activated. Same when I unlock it as the alarm is deactivated.

Asked by for the 1998 Mercedes-Benz E320 4MATIC
these are vacuum operated lock actuators, operated by a central pump under the rear seat. unless you have a good
deal of MB experience, it may be better to let a local
independent MB shop take a look at this.